Develop Bugs

Is TP2 battery life affected by partial charge-discharge cycles

Hi All,
When cellphones first came out, it was recommended to use the battery till it was almost empty and then charge it fully. This would maintain the batterys charge carrying capacity.
I wanted to ask if this still holds true with the TP2 and the new Li-Ion batteries?
Specifically, if you keep charging the TP2 every night (lets say when it is at always at 60% capacity and charge it to 100% by morning), will it substantially decrease battery life?
Thoughts would be welcome!

There are a few schools of thought on that one, and to be sure, since you have opened the can, all the worms are now about your feet
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Have fun putting them back in the tin again
Seriously, now...
Li-ion batteries do not suffer from the old Ni-Cad "memory effect". They suffer a loss of capacity and charge efficiency instead.
There's a rather good article on this over on wikipedia (link), but the long and the short of it is that for every charge, whether partial or full, the battery's ability to retain a full charge for a long period of time is lessened.
Thus, the longer you have the Li-Ion battery, and the more you recharge it, the more pronounced the effect, to the point where a couple of years down the line, the battery will take a full charge alright, but it might only hold that charge for a couple of hours at best.
The next stage in mobile device power cells will be Lithium Polymer (link), but that's new (relatively) tech, and there are a few problems in charging them - they require very specific charging handling to be safe/efficient.
Hope the above helps

Apologies
Apologies, but a detailed answer to this has already been posted in the Wiki. I should have read that first.
In a nutshell though it seems like this problem is not there anymore. Infact it is recommended to charge from a partially charged state as compared to a fully discharge state. Please read teh Wiki for more information

Thanks!
Roger Stenning: Thanks!
Also, people may want to take a look at the forums Wiki (not Wikipedia) to get more views
Over and out

Simple. LiIon batteries like being charged early and often. Don't deep discharge them unnecessarily. However, it is not necessary to plug them into the wall every time you get off the phone. My typical charge cycle is overnight and in the afternoon at work I'll charge the phone, that has always gotten me through the whole day on my last 3-4 different phones.

I always end up charging my phone up often, mainly because I use it as my mp3 player, so don't want to run out of charge whilst walking. With replacement batteries at £20 off quid I don't see it as too much as a problem.

Oh yeah, almost forgot - if you don't want to charge the phone while you're synching with your PC, go to settings -> all settings -> power and check the box "When device is turned on, do not charge the battery when connected to the PC."

Dear all,
There's a really useful guide to maintaining laptop and phone batteries from Battery University, cut into a short overview at http://www.reghardware.co.uk/2009/05/07/beginners_battery_maintenance/
Definately worth a read and busts a lot of the myths out there.
Adam.

Everyone seems to agree that keeping a battery charged is the best way to go.
Yet common sense tells me that since the optimum storage charge is 50%, then the battery might last the longest if it's operated around that level.
In other words, if your battery is around 60-70% and you can afford that, don't charge it until it drops to maybe 30-40%, then charge it back to 70%.
Does that make any sense?

not realy, I'm afraid. Read the wiki I linked to - you'll see that when a Lithium-Ion battery is charged, resistive deposits collect inside the electrolyte, causing the battery to be able to maintain a full charge for less time after each successive charging cycle. It's therefore best to charge the battery to its' fullest capacity each time, and allow it to drop to (my personal preference for Li-Io kit) no lower then 20% or so, so as to maximise the usable life of the battery. I can show you an Li_Io battery from my last pda/phone, an HP iPAQ hw6915, where the battery is so knackered that it'll only hold a charge for an hour - at best. That, after two years of partial charges due to repeated resyncs and concequential recharging in the interface cradle.
Hope the above helps you with a reasonably informed decision

RogerStenning said:
not realy, I'm afraid. Read the wiki I linked to - you'll see that when a Lithium-Ion battery is charged, resistive deposits collect inside the electrolyte, causing the battery to be able to maintain a full charge for less time after each successive charging cycle. It's therefore best to charge the battery to its' fullest capacity each time, and allow it to drop to (my personal preference for Li-Io kit) no lower then 20% or so, so as to maximise the usable life of the battery. I can show you an Li_Io battery from my last pda/phone, an HP iPAQ hw6915, where the battery is so knackered that it'll only hold a charge for an hour - at best. That, after two years of partial charges due to repeated resyncs and concequential recharging in the interface cradle.
Hope the above helps you with a reasonably informed decision
Click to expand...
Click to collapse
I think you're reading it wrong.. A charge cycle does not mean you plugged in the charger, it means it's a full cycle. Not necessarily from 0, but charging it 2-3% while your syncing would not be considered a "charge cycle".

khaytsus said:
I think you're reading it wrong.. A charge cycle does not mean you plugged in the charger, it means it's a full cycle. Not necessarily from 0, but charging it 2-3% while your syncing would not be considered a "charge cycle".
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Click to collapse
Whenever current goes in, that's "charging". The more you do it, the less the battery holds. Period. It doesn't matter if you didn't get it all the way "full" or not, it matters if you plugged it in. Basically, using a rechargeable battery wears it out. I know, it's hard to believe. Discharging a cell completely wears it out extra fast. Don't do that.
FYI, the Prius never tries to never discharge it's (NiMH) battery below 40%, nor charge it over 60%. It does this to maximize the life span of the cells, but of course, it means your battery has a whole lot less usable capacity. It's a trade-off.
"Memory effect" basically doesn't exist, not in any circumstances you've ever encountered. I recommend reading this:
Dan's Quick Guide to Memory Effect, You Idiots

godefroi said:
FYI, the Prius never tries to never discharge it's (NiMH) battery below 40%, nor charge it over 60%. It does this to maximize the life span of the cells, but of course, it means your battery has a whole lot less usable capacity. It's a trade-off.
Click to expand...
Click to collapse
If that's true, then it's basically what I said, except not in such an extreme. And the other guy said "oh no, not really".

acrh2 said:
If that's true, then it's basically what I said, except not in such an extreme. And the other guy said "oh no, not really".
Click to expand...
Click to collapse
Right, I'm reinforcing what you said.

QUESTION! battery discharge
godefroi said:
Right, I'm reinforcing what you said.
Click to expand...
Click to collapse
Found this old thread! Had a question. I have had the TP2 since it came out, I used to only have to charge it every other day or every 3 days. Now it is loosing charge quickly. Half a day at best. A day max with medium use, when medium use for 2 1/2 days killed the battery.
What is going on? Have Nue installed, seems that the voltage discharging is normal. But it seems to also drop from 10-0 REALLY quickly too. For instance, last two recharges have gone from 10 percent to 8 to 6 to 1% (nue showed it as 2 for about 30 seconds then it too showed at 1%.
What is going on with my battery?

[Q] where to buy 2A wall charger?

Where can I get a decent 5V 2A wall charger?
I've searched through ebay, amazon, dealextreme, ncix, infonec, newegg, no avail yet.

erhh..... it's the first item on the search list
http://s.dealextreme.com/search/2A+wall+charger
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If you can order this one, get it. It can charge 2 phones at a time and is considered a rapid charger.
T-Mobile rapid charger

or you can also use one of these http://www.dealextreme.com/p/universal-ac-to-12v-car-cigarette-lighter-power-adapter-2705, with the 2A car charger that you already got

AllGamer said:
erhh..... it's the first item on the search list
http://s.dealextreme.com/search/2A+wall+charger
Click to expand...
Click to collapse
If you look at the 4th picture the "user instruction" clearly says it's 300-500mA. This item is mis-advertised...

The_Biz said:
If you can order this one, get it. It can charge 2 phones at a time and is considered a rapid charger.
T-Mobile rapid charger
Click to expand...
Click to collapse
This one is 2A? I can't find the specs.

AllGamer said:
or you can also use one of these http://www.dealextreme.com/p/universal-ac-to-12v-car-cigarette-lighter-power-adapter-2705, with the 2A car charger that you already got
Click to expand...
Click to collapse
Its output current is 500mA... and it seems a little weird to be honest...

513263337 said:
If you look at the 4th picture the "user instruction" clearly says it's 300-500mA. This item is mis-advertised...
Click to expand...
Click to collapse
After a second read, seems that the "user instruction" is not for that device. The picture on the instruction looks similar but is actually different from the device. So maybe the seller got things mixed up.

513263337 said:
This one is 2A? I can't find the specs.
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Click to collapse
Idk what the output is tbh. But I have several of their chargers and they charge fast. Faster, way faster than the slow stock charger.
____________________
Deebo took your bike too?

The_Biz said:
Idk what the output is tbh. But I have several of their chargers and they charge fast. Faster, way faster than the slow stock charger.
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Click to collapse
If the T-989 circuitry is anything like the ATT Samsung Infuse, ATT Samsung GS2 or the Galaxy S1 variants the charging current is LIMITED by the ROM & hardware and the MAX current for the device limited by the chipset is ~600mah so a higher current charger won't help, it's probably placebo effect.
I believe Entropy512 on the ATT GS2 forum has done some heavy investigation into the integrated chipsets in the phones used for charging these devices and has confirmed these limitations using the manufacturers chipset specs.
He was able to jack up the max charge current about 100mah or so on a couple devices in the kernel. But a larger charger is going to make very little if any difference. The phone automatically current limits to prevent overcharging the battery or at worse an explosion. These batteries are very dangerous at too high current.
Bottom line is you could use a 10amp charger and the phone will only charge at it's rated capacity which a WAY WAY below 2000mah and probably no more than 700mah on these phones.

I'm on the stock rom and these chargers are better than the stock though. The car charger version can charge the phone very fast (within an hour). I know from use that these can charge a stock gs2 faster than the stock charger. I got them because the sensation took 8days 22minutes and 43 seconds to fully charge. And I kept them for the gs2.

The_Biz said:
I'm on the stock rom and these chargers are better than the stock though. The car charger version can charge the phone very fast (within an hour). I know from use that these can charge a stock gs2 faster than the stock charger. I got them because the sensation took 8days 22minutes and 43 seconds to fully charge. And I kept them for the gs2.
Click to expand...
Click to collapse
Electronics 101 says either you are incorrect or something is defective. If something is charging at 500mah (standard Samsung wall charger charge rate) and the capacity of the battery is 1850mah it must take less than 4 hours. 1850/500=3.7hrs (which probably can vary 25% depending on a number of variables). If it fully charged from zero to 1850 in "less than an hour" that means the phone is being charged at a rate of almost 2AMPS/hour. If that is the case (and it is not) your phone would have been a pile of molten smoking plastic because the charge rate of the phone is limited to AROUND 600mah. 2000mah, which is about what a 1hr charge from empty to full would be on an 1850mah battery would wipe out the phone and/or probably explode the battery.
Either your phone battery is displaying incorrect "emptyness" or something else is wrong because what you describe is not possible. Either the 8 days or the 1 hour on an empty battery unless SOMETHING is off.

Really? The phone has its own max of 600mA? You are the first one I heard that has this information. If this is true then it's a little mind blowing... Everybody else is recommending using some higher current charger...

MisterEdF said:
Electronics 101 says either you are incorrect or something is defective. If something is charging at 500mah (standard Samsung wall charger charge rate) and the capacity of the battery is 1850mah it must take less than 4 hours. 1850/500=3.7hrs (which probably can vary 25% depending on a number of variables). If it fully charged from zero to 1850 in "less than an hour" that means the phone is being charged at a rate of almost 2AMPS/hour. If that is the case (and it is not) your phone would have been a pile of molten smoking plastic because the charge rate of the phone is limited to AROUND 600mah. 2000mah, which is about what a 1hr charge from empty to full would be on an 1850mah battery would wipe out the phone and/or probably explode the battery.
Either your phone battery is displaying incorrect "emptyness" or something else is wrong because what you describe is not possible. Either the 8 days or the 1 hour on an empty battery unless SOMETHING is off.
Click to expand...
Click to collapse
Argue after you've tried the charger I mentioned.
Edit: The 8 days was a joke. Saying the sensation is slow.

The_Biz said:
Argue after you've tried the charger I mentioned.
Click to expand...
Click to collapse
Believe what you wish. Either the charging indicator on your phone was/is showing incorrect information (ie: showing discharged when it really isn't so it seemed to "charge faster") or something else is wrong. As I said, the phone is limited by it's circuitry to it's charge rate. There is no way around that.
---------- Post added at 08:01 AM ---------- Previous post was at 07:37 AM ----------
513263337 said:
Really? The phone has its own max of 600mA? You are the first one I heard that has this information. If this is true then it's a little mind blowing... Everybody else is recommending using some higher current charger...
Click to expand...
Click to collapse
Absolutely, it is current limited as is any electronic device especially those using Lithium Ion batteries which can easily explode if charged too fast (note the recent Chevy Volt problems). If it was not limited you could theoretically plug it in to a 10amp DC charger and fully charge it in 10 minutes or less. I know that the Infuse and AT&T i777 GS2 are either current limited at 500 or 600mah, Even if this device was 700mah because it has a larger battery it still can't be charged in anywhere near 1hr from empty to full.
Entropy512 over on Samsung Infuse and now Galaxy S2 i777 boards actually spec'd out the chip on the phone from the manufacturers data sheets as well as verified it by testing. He discovered the charging rate can be modified a bit in the Kernel and did jack it up a few mah.
SOMETHING internal has to limit the amount of current that goes into the battery and when to reduce it to a trickle charge and then shut it off.
This is what happens to a Lithium Ion batter when you overcharge it: http://www.youtube.com/watch?v=vS2hGoJVmlA or this http://www.youtube.com/watch?v=jjAtBiTSsKY or this http://www.youtube.com/watch?v=jjAtBiTSsKY (the last one, a laptop, is my favorite).
Yes, higher rated chargers will help to an extent because Samsung (or any manufacturer) has to conservatively rate it's chargers for safety. Their stock chargers are IIRC rated at 500mah. The phone can still handle maybe 600 or 700mah so a higher rated charger WILL charge somewhat faster if it can produce the 700mah rather than the 500 (or less) mah.
However to charge the phone with its 1850 mah (1.85amps/hr) battery in 1 hr from 0 to full would require approx 2AMPS in 1 hour which far exceeds the circuitry OF THE PHONE.
If it did SEEM TO happen either the phone is showing discharged when it's really 3/4 full or the battery is defective and is no longer able to take a full charge and is showing full when it is really on 1/4 full.
Putting 2000mah (2amp/hr) into this battery which would be what would be needed to charge it in an hour would literally blow it up so the charge rate MUST be (and is) limited by the device itself.
Check out Entropy212 on the other boards for more technical details for the other Galaxy "family" devices. This one is no different.

either way the math might be right, but i doubt that's the case
else how do you explain it actually works?
with a 2A charger it finishes charging faster than with a 1A charger
and either of those are faster than the stock charger
the battery doesn't over heat either, it gets warm just like when you use the stock charger

AllGamer said:
either way the math might be right, but i doubt that's the case
else how do you explain it actually works?
with a 2A charger it finishes charging faster than with a 1A charger
and either of those are faster than the stock charger
the battery doesn't over heat either, it gets warm just like when you use the stock charger
Click to expand...
Click to collapse
I explain it this way: It does not work. It is impossible. It's electronics 101. You can't charge and 1850mah battery with 600 or 700 mills (which is what the phone allows) in 1 hour. Just like you can't turn water into liquid gold.
As I have explained before:
It may LOOK like it's working for any of the following reasons:
The battery is defective and is not fully charging. Maybe it's only charging half way and when charging ends it shows full.
The phone is showing a full charge when it really is not fully charged.
The battery is showing discharged when it really is not thereby taking a short time to charge it back up.
Here is a thread with pretty much proof. This guy has a good HP brand 2amp charger and it takes 3hrs 15 minutes to charge: http://forum.xda-developers.com/showthread.php?t=1349373 which is exactly how it should be.
If the battery charged in 1hr it would get so hot the phone would probably melt. Believe what you want, you cannot charge this device in an hour from fully drained to FULL charge. The internal circuitry will not permit it. It has been documented in the ATT GS2 and ATT Infuse threads exactly what chipset is used and what the current limiting specs are from the chip manufacturers data sheets by a well respected developer. This phone is no different. It's charging rate is LIMITED by the phone to 600-700mah. Maybe you can push it to 3hrs by tweaking the charge rate in the kernel but 1hr is not possible and would be very dangerous.

DUDE!
Try the charger I mentioned and then come back here and tell me how your phone is messed up, reading wrong, charging wrong, stupid, can't read its own charge rate, eats twinkies or whatever.. Jeezus...
The t-mobile branded chargers, charge faster than the stock chargers. I've tried this on a hd2, blackberries, htc sensation and a t-mobile sgs2..... . Some people, boy I'll tell ya.
I have had these car chargers for a year and every phone I've hooked it to, can charge really fast. But I guess there's no way on earth, according to you, this is possible.
T-mobiles chargers are rapid chargers. Even nextel use to sell rapid chargers for their phones. The phones came with a slow charger, and they sold a faster charger for like $20. That was back in the 90's.
And I have 3 t-mobile branded chargers. So I guess all of them and the phones are all damaged.
---------- Post added at 09:43 PM ---------- Previous post was at 09:37 PM ----------
MisterEdF said:
This guy has a good HP brand 2amp charger and it takes 3hrs 15 minutes to charge: http://forum.xda-developers.com/showthread.php?t=1349373 which is exactly how it should be.
Click to expand...
Click to collapse
And since "this guy" has a hp charger, there's no way on earth a person could have one of a different brand that actually charges faster. How dare I argue this with a guy who knows so much....
---------- Post added at 09:47 PM ---------- Previous post was at 09:43 PM ----------
And here, this was the reason I bought them, from this article.
READ!
t-mobiles-new-charger-line-is-surprisingly-interesting-fast-e/
"and all of them promise to charge your handset 20 to 50 percent faster than a standard model"
---------- Post added at 09:48 PM ---------- Previous post was at 09:47 PM ----------
Maybe engadget doesn't know about the hp charger guy and they all have defective phones with defective batteries too?

@MisterEdF
I'd rather believe in the actual proven to work results.
because it's been working exactly like that for the past several phones i've owned
simple enough prove when the phone is plugged in with the stock charger, the battery level (battery %) will keep dropping instead of charging if GPS, Bluetooth, Screen, and/or GPS is constantly ON, the battery will never charge, it will just run dry eventually
reason why you see many members reporting it takes them 9 hours to charge or 18 hours to charge
the phone is draining the battery faster than it can replenish itself
in the other hand if you use a more powerful charger, 1A or 2A then you will actually see the battery gain charge (gain %) as the phone is in continue use.
with a 1A charger the battery level remains pretty much flat during charge, with all the features enabled
with a 2A charger it gains battery level, even when all the features are enabled
here's another point of view...
with the stock charger the battery loses 3% in 15 minutes with all the features enabled
with the 2A charger the battery gains 3% in 15 minute with all the features enabled
the only way for the stock charger to gain 3% in 15 minutes is to turn off GPS, turn off WiFi, turn off Bluetooth, and keep the screen off
Does that make sense using your math? No, but that's real life vs. math equations

And omg, look - T-Mobile branded car charger.
Even t-mobiles description says "·Charge faster while on the go"
Holy ****!

2A charger vs included 1A?

Hey all, question here about chargers.
I have 3 chargers at my disposal, a Samsung travel charger @0.7A, included charger block @ 1.0A, and my HP Touchpad block @ 2.0A.
The touchpad charger charges from empty to full in 3h15m, uninterrupted. Not blindingly fast, but good.
The included one takes around 4+ hours.
The travel one is so slow, check out the screenshot below, over 5 hours and at 94% only.
Question is, is there any detriment to using the non standard included charging brick or can I use the higher amperage charger safely?
Thanks
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mettleh3d said:
Question is, is there any detriment to using the non standard included charging brick or can I use the higher amperage charger safely?
Thanks
Sent from my SGH-T989 using Tapatalk
Click to expand...
Click to collapse
None whatsoever.

ive been reading that the phone is capped at ~0.65A for charge rate

@mettleh3d
if you had turned off WiFi it would probably have reached 100% before 5 hours using the 0.7A charger
using the included 1A charger it takes exactly 3hr+45m to go from 0% to 100% measured

AllGamer said:
using the included 1A charger
Click to expand...
Click to collapse
Was I cheated by T-Mo? The charger that came with mine is labeled "travel charger" and is .7A.

Actually guys, there are drawbacks to using higher amperage.
The standard charger of 1.0 amps was bundled with the battery because it was engineered that this combination would yield around 300 charging cycles before the battery starts losing it's efficiency.
The faster (higher amps) a charger you use the faster your phone will charge. However, fast charging cycles negatively affect the longevity of the battery. Fast charging cycles also will severely increase the charging temperature of the phone and its battery and depending on how high it gets, it may be detrimental to the phone or battery. The higher amps the charger is, the quicker the battery will start being less efficient. Put in other words, if you use a 2 amp charger every day, the battery may only last 200 charging cycles before you start noticing that your battery is getting weak.
Conversely, if you use a lower-specced charger than the 1.0 Amps Samsung provided, your battery longevity may improve. I do not have numbers exactly but if you are interested, go read on the subject. My guess is if you use the 0.7 amp charger, you may be able to successfully get 320 or 330 charge cycles out of your battery. Again, don't quote me on these numbers.
I'd suggest for every-day usage you continue using your 1.0 Amp charger that Samsung provided. For travel or on the spot (when you quickly need battery juice) feel free to use the 2.0 amp charger. As long as you don't use the 2.0 charger every day, you are fine. Every now and then is perfectly acceptable.

thanks alienz, was hoping for a detailed response like this.

Technically phones have regulators that only allow an amount of amps to be charged with. But I would only charge with the Samsung included one. Like I tried to use Apples charger block but it somehow charged my phone slower
Sent from my SGH-T989 using XDA App

yup, i can confirm from experience from my previous phones
it's mostly the heat that damages the battery, it doesn't really affect the phone itself
}{Alienz}{ said:
The faster (higher amps) a charger you use the faster your phone will charge. However, fast charging cycles negatively affect the longevity of the battery. Fast charging cycles also will severely increase the charging temperature of the phone and its battery and depending on how high it gets, it may be detrimental to the phone or battery. The higher amps the charger is, the quicker the battery will start being less efficient. Put in other words, if you use a 2 amp charger every day, the battery may only last 200 charging cycles before you start noticing that your battery is getting weak.
Click to expand...
Click to collapse

IMO my time is worth more than a few extra cycles of a battery. Just pick up a few extra ones. Not like the OEM will last forever if you trickle .001 A into it every time.

+1
madman604 said:
IMO my time is worth more than a few extra cycles of a battery. Just pick up a few extra ones. Not like the OEM will last forever if you trickle .001 A into it every time.
Click to expand...
Click to collapse
i carry always a spare pack with me
and an extra one is always ready in the office, and another at home, and one more in the car, i keep swapping the car one more often just because it's winter and it's also the one that will get charged the least if i leave it in the glove box

AllGamer said:
i carry always a spare pack with me
and an extra one is always ready in the office, and another at home, and one more in the car, i keep swapping the car one more often just because it's winter and it's also the one that will get charged the least if i leave it in the glove box
Click to expand...
Click to collapse
That thing you said about heat...
Sent from my SGH-T989 using Tapatalk

mettleh3d said:
That thing you said about heat...
Sent from my SGH-T989 using Tapatalk
Click to expand...
Click to collapse
really cold batteries dont work.

First a little ohms law: I = V / R. Amps(I) = Volts(V) divided by Resistance(R)
The phone charger probably puts out 5 Volts (mine does). The resistance is determined by the phone. So the charge current is not going to change just because you have a 2amp charger vs a 1amp charger. The only way to force more amps into the phone is to increase the voltage of the charger. For example say the phone resistance is 5 ohms, then the charger will put out 1 amp (5V/5R). To charge at 2 amps, you would need to up the voltage to 10 volts. DO NOT DO THAT! YOU WILL DISTROY THE PHONE!
It is also probable that the phone has an internal charging circuit to control the actual current to the battery, so that if you leave the charger plugged into the phone, the battery does not overcharge. That circuit is going to cut off the voltage to the battery when is senses the battery is fully charged.
If the phone is trying to pull more amps then the charger can provide, the charger will be getting quite hot. As long as the charger is not hot, then it is providing enough current for the phone to charge properly.

While your logic is sound, the HP touchpad charger definitely charges the device faster than the included brick.

The phones internal charging circuit will only draw as many milliamps as its designed for.
If its designed to only draw 750mA because thats all the circuit is designed to draw max on A/C then thats all it will draw off the 2000mA adapter.
The speedier charging is a placebo effect.
Just because a power source can supply it does not mean the device will use it all.

http://forum.xda-developers.com/showthread.php?t=1332522
read this. exhaustive testing and info !

madman604 said:
http://forum.xda-developers.com/showthread.php?t=1332522
read this. exhaustive testing and info !
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Click to collapse
A faster charge off the OEM adapter that outputs 750mA as opposed to a usb port that outputs 450-500mA max is not new news or surprising and makes total sense
This also does not negate my statement of the device will only charge as fast as the circuit allows it to. so if its designed for 750mA max, charging from a 2000mA charger will yield the same charge in the same amount of time but with a placebo effect, because users think bigger must mean faster, with out taking into account the basics of charging circuit mechanics and basic properties of electricity and current.
Your phone will only draw as much current as it needs to charge the battery, and if the circuit only needs 750mA, it is not designed to work with any more, then thats all it will pull, always. No exceptions.

I can test with all 3 chargers and post my results.
They will be from 0% to 100% no breaks, on airplane mode, and i wont touch the device other than to monitor progress now and again; probably overnight. battery indicator pro shows what time i plugged in and what time it reached 100%, i'll take screenshots throughout.
While I don't refute the circuitry inside and the rules they obey (im an MAE from UCLA), i really want to show that charging time is decreased with the 2A.

I can think of a couple of reasons it might charge slower with the 1amp charger.
1. The phone will pull more than 1amp when charging. I doubt that it does. I think the nominal charge rate is somewhere around 750mA.
2. The 1amp charger is defective. Maybe it only puts out 500mA. These little chargers are pretty realiable, but out of the millions they make, a few defective ones may get out.
3. The phone was not in the same state when you did the tests. For example, if you are overclocking, maybe you had different clock rates or governer selected. Or maybe there are some background apps, waking up, and slowing the charging time.
4. You are mistaken about how long it takes to charge.
-LF

DoD: Depth of Discharge for li-Ion batteries

I was browsing the web in search for an answer for a simple question:
"How to properly charge your li-ion battery and increase battery life?"
This is what I got so far.
1. Battery life cycle: Any Li-Ion battery life is measured based on how many times can you discharge it from 100% to 0%. Normally the figure is 300-500 times and it depends on a factor called DoD (Depth of Discharge).
2. Depth of Discharge (DoD): Quite self-explanatory thing. If you have 20% charge left, it means that DoD=80%. The higher is the DoD the lower is your battery life cycle.
Comparison table is here:
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So, here's the answer to the painful question "Why should not I discharge my li-ion to 0%?" The answer is - your battery will die faster. I'm trying to get used to put both my OEM and Mugen Power batteries to charge right after my Nexus informs about 15% charge left.
3. Deep discharge: Not allowed for li-ion batteries. This is pretty interesting: Li-ion should never be discharged too low, and there are several safeguards to prevent this from happening. The equipment cuts off when the battery discharges to about 3.0V/cell, stopping the current flow. If the discharge continues to about 2.70V/cell or lower, the battery’s protection circuit puts the battery into a sleep mode. This renders the pack unserviceable and a recharge with most chargers is not possible. To prevent a battery from falling asleep, apply a partial charge before a long storage period.
Also: Do not recharge lithium-ion if a cell has stayed at or below 1.5V for more than a week.
So, what I got from this section is - when I get to 0%, I will not try to switch on my phone again because that can damage my battery.
4. Don't charge in small portions: This is important in a long term for higher capacity batteries. If you use an extended 3000+mah battery it's important to use the whole capacity of the battery to avoid aging of cells that are not used. It's recommended to charge your extended battery to 100% from time to time.
5. Recycle your batteries
I think this article here could be updated a little with these.
http://forum.xda-developers.com/showthread.php?t=518861
Sources:
http://mugen.tv/?p=690
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries

Most smartphone maintain a charging current even after the 100% charge level is reached. I think that this should also have an effect on battery life....
What is your opinion ?

7_michel said:
Most smartphone maintain a charging current even after the 100% charge level is reached. I think that this should also have an effect on battery life....
What is your opinion ?
Click to expand...
Click to collapse
I think that in this case battery is protected with the battery's controller that only opens the current when the discharge level is below a certain point. That is why it's safe to keep your phone on charge overnight.

This part is wrong
. Don't charge in small portions: This is important in a long term for higher capacity batteries. If you use an extended 3000+mah battery it's important to use the whole capacity of the battery to avoid aging of cells that are not used. It's recommended to charge your extended battery to 100% from time to time.
if you notice if you always discharge to 50% you will get 1500 discharge cycles, that's not 1500 discharges to 50%, but 1500 full charge cycles, which would be recharging it to 100% twice from 50%, so by going from 100% and always recharging at 50% you get 50% more life out of your battery. Li-ion batteries last longer when not full discharged regularly, sadly usage of a smartphone is not very well suited for keeping it at a high charge as most users, even me, don't charge multiple times a day but try to optimize their phone so they only have to recharge once a day at night, which is the reason I like removable and replaceable android phone batteries
Li-ion batteries also are smart in that they intelligently charge and discharge cells so that certain cells won't age more than others, so you don't have to worry about that.
Also this is for another poster, the batteries have protection circuits to ensure that you don't overcharge your phone, so leaving it on the chargers after 100% I charge my phone each night to 100% and it doesn't do any damage to the battery.

movielover76 said:
This part is wrong
. Don't charge in small portions: This is important in a long term for higher capacity batteries. If you use an extended 3000+mah battery it's important to use the whole capacity of the battery to avoid aging of cells that are not used. It's recommended to charge your extended battery to 100% from time to time.
if you notice if you always discharge to 50% you will get 1500 discharge cycles, that's not 1500 discharges to 50%, but 1500 full charge cycles, which would be recharging it to 100% twice from 50%, so by going from 100% and always recharging at 50% you get 50% more life out of your battery. Li-ion batteries last longer when not full discharged regularly, sadly usage of a smartphone is not very well suited for keeping it at a high charge as most users, even me, don't charge multiple times a day but try to optimize their phone so they only have to recharge once a day at night, which is the reason I like removable and replaceable android phone batteries
Li-ion batteries also are smart in that they intelligently charge and discharge cells so that certain cells won't age more than others, so you don't have to worry about that.
Also this is for another poster, the batteries have protection circuits to ensure that you don't overcharge your phone, so leaving it on the chargers after 100% I charge my phone each night to 100% and it doesn't do any damage to the battery.
Click to expand...
Click to collapse
The "charge in small portions" is correct. What I meant is this if your battery is charged up to 50% and you keep charging it to 75% and never up to 100%, that is not good practice. Experience with new li-ion batteries shows that once or twice in a week it's important to charge it up to 100%.
Regarding the protection in the batteries - it works against overcharging, but sadly, not against overdischarging. Your phone will allow you to switch it on one or two times after the indicator shows the zero level. It's important NOT to do that because that damages chemistry in any type of batteries including li-ion.

okishead said:
The "charge in small portions" is correct. What I meant is this if your battery is charged up to 50% and you keep charging it to 75% and never up to 100%, that is not good practice. Experience with new li-ion batteries shows that once or twice in a week it's important to charge it up to 100%.
Regarding the protection in the batteries - it works against overcharging, but sadly, not against overdischarging. Your phone will allow you to switch it on one or two times after the indicator shows the zero level. It's important NOT to do that because that damages chemistry in any type of batteries including li-ion.
Click to expand...
Click to collapse
1. Read this: http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
"Li-ion does not need to be fully charged, as is the case with lead acid, nor is it desirable to do so. In fact, it is better not to fully charge, because high voltages stresses the battery."
2. This: http://www.centralhobbies.com/instructional/lithium.html
1. Charge often. Don't try to fully discharge the battery packs frequently. This only adds strain. Several partial discharges (regular use) with frequent recharges are better for lithium-ion than one total discharge.
Confusing, yes, sure is.
Basically, for Li-Ion battery.
1. NEVER allow deep discharge (to 0%). Once in a while, I still get an article on web suggesting let the battery completely discharged. Hmmm.
2. Fully charge (to 100%) is not good either, partially charge is better. Confuse enough?

Yes confusing!!!
Sent from my LG-P999 using xda premium

Newer charging li-ion battery over 90% will double it's lifetime. This is mentioned also in battery university page. Some laptops also include battery care function which limits full charge to 80%. This is good evidence that this is the way to prolong battery lifetime.

At first , i was agree with almost all of the article on the Internet about li ion battery.
But, after reading one comment from batteryuniversity article, this guys comment is refusing the article opinion that li ion do not have memory effects.
After doing some searching , wow , its true that li ion DO HAVE MEMORY EFFECTS like nicd do.
So what i do is always completely fully discharged my battery before charging it again. Actually, its almost impossible for smartphones battery to fully discharged while being using till the screen goes off by itself. Im using note 3 which has removable battery.
And yes. I dont have any problem with fully discharged my li ion battery. Battery still as good as new although being fully discharged for many2 times. Hard to believe? Try it and u will agree with me.
Sent from my SM-N900 using XDA Free mobile app

dojodo said:
At first , i was agree with almost all of the article on the Internet about li ion battery.
But, after reading one comment from batteryuniversity article, this guys comment is refusing the article opinion that li ion do not have memory effects.
After doing some searching , wow , its true that li ion DO HAVE MEMORY EFFECTS like nicd do.
So what i do is always completely fully discharged my battery before charging it again. Actually, its almost impossible for smartphones battery to fully discharged while being using till the screen goes off by itself. Im using note 3 which has removable battery.
And yes. I dont have any problem with fully discharged my li ion battery. Battery still as good as new although being fully discharged for many2 times. Hard to believe? Try it and u will agree with me.
Sent from my SM-N900 using XDA Free mobile app
Click to expand...
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I have always gone by the recharge before it gets low rule, and told my friend the same with his HTC desire. His went over 3 years before original battery got tired. I haven't had any battery issues yet on phones I had new.
My ex thought it was best to discharge all the way and she had a laptop, an iPod and an iPhone all with basically ruined batteries. So I don't agree with you. I agree with the majority of the articles I've read like the battery university one.
Sent from my Nexus 4 using XDA Free mobile app

Wireless charger concerns - no shut off

I have read all the wireless Qi charger threads and thought my particular insight and concerns may warrant a new thread. I am no battery or Qi charging expert, so please take this with the apppropriate grain of salt.
I purchased a generic Qi charger that is the same as many China made chargers like this one on Amazon: http://www.amazon.com/Docooler-Wireless-Transmitter-Charging-Dissipation/dp/B00F5STIUK. My concern with this unit, and many of the inexpensive ones being sold, is that they do not shut off after reaching full charge. Some will go to a lower trickle charge, (as I was informed by customer service for the popular Choetech upgraded charging pad available on Amazon), but my understanding is that neither continuouis charging nor trickle charging is good for Lithium Ion batteries. Take a look at the information at Battery University: http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries and you will see that over time, these over-charging conditions will degrade the battery. It is nice to have a convenient charger that allows you to have the favorable condition of many small, topping off charges, rather than more fully discharging the battery (which is a no no), but if the charger does not completely shut off when the battery is at, or near, 100%, it may be just as bad. By the way, according to Battery University, it is also beneficial to run your battery charge somewhere below 100% and of course keep the battery cool.
So I keep reading about people being upset because their charger shut off at night and they don't have a full charge in the morning and then praise the units that apparently trickle charge like the Choe pad. From all the information I have read, this is just plain wrong from a battery performance and longevity standpoint. You DO want the unit to shut off on full charge and you do not want it to trickle charge (excess charging of any amount is not handled well by Li-ion). The units that shut off and that do not charge again without removing and replacing the phone will have less charge in the morning due to standby battery drain. The better units will shut off at, or near, 100% and will automatically charge again when the battery drains slightly. (This is not to be confused with trickle charging, where the battery is constantly at 100%). Its very difficult to find affordable chargers that meet this basic criteria. So far, the Zens Qi charging pad is one of the few that is clearly reported as doing this right.
Because I hope to keep my Nexus 5 for a few years and maintain battery health, I would certainly appreciate additional input on this subject and any suggestions on other charging pads that meet this requirement.

The Nexus 5 does NOT have a lithium ion battery. So there's one mistake.
_______
Sent from my Nexus 5 (LG-D820)

ChazzMatt said:
The Nexus 5 does NOT have a lithium ion battery. So there's one mistake.
_______
Sent from my Nexus 5 (LG-D820)
Click to expand...
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Sure it does

wyrman said:
Sure it does
Click to expand...
Click to collapse
No it does not. Go do some research. It has a different type of lithium battery.
_______
Sent from my Nexus 5 (LG-D820)

ChazzMatt said:
No it does not. Go do some research.
_______
Sent from my Nexus 5 (LG-D820)
Click to expand...
Click to collapse
http://www.ifixit.com/Teardown/Nexus+5+Teardown/19016

Lithium polymer
Sent from my SPH-L710 using Tapatalk

twister99403 said:
Lithium polymer
Sent from my SPH-L710 using Tapatalk
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EXACTLY. NOT Lithium Ion.

wyrman said:
Sure it does
Click to expand...
Click to collapse
Actually, you are right that it has a lithium ion polymer battery, abbreviated LiPo, but Battery University states "charge and discharge characteristics of Li-polymer are identical to other Li-ion systems." It is about thin manufacturing, not needing a rigid grid. and apparently does not change any of the other characteristics. So my assumptions and conclusions above, still stand.

Lithium Polymer is different, from what I read..
http://www.androidauthority.com/lithium-ion-vs-lithium-polymer-whats-the-difference-27608/

ChazzMatt said:
EXACTLY. NOT Lithium Ion.
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Exactly. I was referring that to Mr. Matter of factly that said sure it does haha
Sent from my SPH-L710 using Tapatalk

Easy mistake to make. But as some have pointed out in the other thread that website is quite ancient and does not pertain to modern batteries.

stuartmc said:
I have read all the wireless Qi charger threads and thought my particular insight and concerns may warrant a new thread. I am no battery or Qi charging expert, so please take this with the apppropriate grain of salt.
Click to expand...
Click to collapse
Think first about your USB wired charger. When the battery reaches its capacity, does the charger stop providing current to the phone? Of course it doesn't. It doesn't pull itself out of the wall socket and of course it's not smart enough to know the capacity of the battery. It will always have the capacity to deliver current to the phone's battery, but the protective circuitry of the phone won't allow it.
I really don't understand the concern here.

ChazzMatt said:
Lithium Polymer is different, from what I read..
http://www.androidauthority.com/lithium-ion-vs-lithium-polymer-whats-the-difference-27608/
Click to expand...
Click to collapse
Sorry you are correct

ChazzMatt said:
EXACTLY. NOT Lithium Ion.
Click to expand...
Click to collapse
It's actually a lithium ion polymer battery, a cheaper to make lithium ion battery using a polymer electrolyte.

floepie said:
Think first about your USB wired charger. When the battery reaches its capacity, does the charger stop providing current to the phone? Of course it doesn't. It doesn't pull itself out of the wall socket and of course it's not smart enough to know the capacity of the battery. It will always have the capacity to deliver current to the phone's battery, but the protective circuitry of the phone won't allow it.
I really don't understand the concern here.
Click to expand...
Click to collapse
I guess my concern is that the Qi charging may be different than charging through the USB port. Do we know for a fact that the phone's "protective circuitry" will stop the current flow in the inductive path? There apparently is something different going on, at least with the Nexus 5, because Choetech support said that charging on their pad completely shuts off with the Nexus 4, but goes to trickle charge on the Nexus 5.

Any gains would be minimal. You're only delaying the inevitable, you're buying yourself a few extra minutes of battery life for a few extra weeks after many months/years of usage. Just trust the engineers and use the tech as it is intended. Don't twist yourself into a pretzel, leave Qi charging tech or battery tech speculation to the engineers, not people who post in forums. If you care so much about these minimal gains, after a year, you'd probably still care enough to buy a replacement battery to get day-one longevity. It's stupid easy to replace the battery in this phone anyway.

quentin0 said:
Any gains would be minimal. You're only delaying the inevitable, you're buying yourself a few extra minutes of battery life for a few extra weeks after many months/years of usage. Just trust the engineers and use the tech as it is intended. Don't twist yourself into a pretzel, leave Qi charging tech or battery tech speculation to the engineers, not people who post in forums. If you care so much about these minimal gains, after a year, you'd probably still care enough to buy a replacement battery to get day-one longevity. It's stupid easy to replace the battery in this phone anyway.
Click to expand...
Click to collapse
Good point, but since you posted here, does that mean that I should discount your speculation as to minimal gains as well? Lol.

From my experience, the firmware of your phone actually plays a role if the Qi charger turns itself off or not. For example, When I bought my Nexus 4 on release, I also bought a Maxell Qi charger at the same time. When my N4 was running stock 4.2 (i never root), the Qi charger would stop charging my phone when it hit 100%, stays off until it dropped to 95%, where the Qi turns on again to top up. And by the Qi charger turning off, the charging light on my Qi charger turns off too, so it's obviously not feeding it any power. Also the charging electric bolt icon on the phone disappears too. This behaviour on my N4 continued until 4.2.2. When I bought the N7 (2013) which ran 4.3, same behaviour.
But when my N7 was updated to 4.3.1, the charging behaviour changed. Upon reaching 100% it would say charged on phone's unlock screen, Qi charger light still lit, and battery bolt icon still on. Basically the same behaviour when the phone/tablet is at 100% charged with the USB plugged in. This behaviour also happened when my N4 was was also updated to 4.3.1. Note this was still using the same Maxell Qi charger I bought back on N4 release. When I N5 arrived, it also has this same behaviour.
Also I recently bought a cheap China brand Qi charger "Maxpower", when after 100% charge (trickle charging) for a while the phone is a lot more warmer while on my Maxell charger the phone cools down, also shown on my battery monitor app. I'm assuming that the Maxell goes into "low power mode". My conclusion is that the phone does control the charger to a certain extent, but at the same time the charger has to support a low and/or off state, which the Maxell does and the Maxpower does not.

This is the kind of information I was looking for, thank you. I think it is important to get the right charger that interfaces with the new firmware of the Nexus 5. Apparently, some charges do it right, and some don't. I too am concerned about the increased heat with the so-called trickle charge like your Maxpower unit. The combination of "over-charging" and increased heat, is about the worst mojo you can have for these types of batteries. As a previous poster stated, it may have only a minor effect over the lifespan of the battery, but since I don't know that with certainty, I just as soon take "the stitch in time that saves nine."
Makaijin said:
From my experience, the firmware of your phone actually plays a role if the Qi charger turns itself off or not. For example, When I bought my Nexus 4 on release, I also bought a Maxell Qi charger at the same time. When my N4 was running stock 4.2 (i never root), the Qi charger would stop charging my phone when it hit 100%, stays off until it dropped to 95%, where the Qi turns on again to top up. And by the Qi charger turning off, the charging light on my Qi charger turns off too, so it's obviously not feeding it any power. Also the charging electric bolt icon on the phone disappears too. This behaviour on my N4 continued until 4.2.2. When I bought the N7 (2013) which ran 4.3, same behaviour.
But when my N7 was updated to 4.3.1, the charging behaviour changed. Upon reaching 100% it would say charged on phone's unlock screen, Qi charger light still lit, and battery bolt icon still on. Basically the same behaviour when the phone/tablet is at 100% charged with the USB plugged in. This behaviour also happened when my N4 was was also updated to 4.3.1. Note this was still using the same Maxell Qi charger I bought back on N4 release. When I N5 arrived, it also has this same behaviour.
Also I recently bought a cheap China brand Qi charger "Maxpower", when after 100% charge (trickle charging) for a while the phone is a lot more warmer while on my Maxell charger the phone cools down, also shown on my battery monitor app. I'm assuming that the Maxell goes into "low power mode". My conclusion is that the phone does control the charger to a certain extent, but at the same time the charger has to support a low and/or off state, which the Maxell does and the Maxpower does not.
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From the pic it shows that its a Lithium Ion Polymer Battery!!! That's straight from the I fix it site!!