Develop Bugs

Evo Charging Times

Can you help me out here? I'm a new Evo owner, but I have a background in electronics which spans nearly 50 years and a fairly comprehensive "technical" knowledge of lithium polymer batteries, chargers, and battery management protocols.
And I want to understand the issues that so many of you are experiencing with your Evo batteries. Why? Because I'm experiencing some of 'em too and if I understand what's happening I might be able to offer solutions. I already have a couple of theories and I even have some ideas for workarounds, but I'm missing a few pieces of the puzzle which I'm hoping you can help me find.
What I'd like to know is how long does it take you to recharge a dead or nearly depleted battery in your Evo. For this information to be useful I'll also need to know the size of the battery (in mAh) and the output of the charger (in mA).
Please note that I'm just as interested in how long it takes to charge a stock battery as I am in how long it takes to charge an extended battery. Likewise for wimpy chargers and high-output chargers. The more diverse the data is the more useful it will be.
So there you have it. Can you help me out? I'll be sharing my conclusions so you might be helping yourself too.
Pete

Reserved for data summary

2 hrs and 20 minutes roughly from dead to full. Stock battery, stock charging cable and adapter.

same, 2 hr 20 min dead to full 1500mAh charging at 1A. i average about 30hrs battery life.
Sent from my PC36100 using XDA App

Interesting. In round figures a 2:20 (2.3hr) charge time for a 1500mAh battery indicates a ~650mA charge rate. This suggests that HTC has built a ~650mA charging current regulator into the Evo because a 1000mA (1A) charge rate would charge a 1500mAh battery in a little over 1.5hr.
The regulated charge rate isn't at all surprising. In fact, it's standard practice in consumer electronics devices. Most LiPo cells can safely be charged at 1C, which would be 1500mA (1.5A) for a 1500mAh battery, but they can react explosively when pushed harder. The folks who engineer consumer electronics also tend to stay well below maximum rates because they need to assume (among other things) that some people will continue to use batteries that are worn out or damaged and really should be replaced.
My primary reason for posting this thread and asking this question is to get enough evidence to determine whether the Evo could be charged faster with more powerful chargers, and the answer seems to be no. It can obviously be charged slower if someone uses a charger with an output below 650mA, but I'd be surprised if it could be charged any faster with a more powerful charger.
And FWIW, a dead 3500mAh battery would take about 5.4hrs to charge at a 650mA charge rate. My guess is this is even how long it will take in Seidio's external charger because the engineers would have to assume that people will also be charging OEM batteries in them.
But this is all assumption based on common engineering practices and 2 reports (so far). I'd sure like to have some more data to work with; especially data for different chargers and battery capacities. Another question I'd like to answer is whether the Evo has a mAh cap or a time limit on a charge cycle. The mAh cap could be tough, but a time limit might be pretty easy to work around.
I suppose I should add one more thing: My job as a maintenance supervisor for a pharmaceutical manufacturing and analytical lab requires that I'm reachable by phone at all times, so the experimentation I can do with my own phone is pretty limited. For example, I can't turn it off to charge the battery and I feel real uneasy about running the battery dead for testing purposes. My phone use habits seem to be served pretty well by the 1500mAh OEM battery but I'd like to have the reserve of an extended battery.
But not at the expense of having to remove the battery from the phone to charge it. That's a deal-breaker for me.
The bottom line is: Please keep posting your charge times and don't forget to include the output of the charger and the mAh rating of the battery. In return, I'll share any conclusions I come to so we can discuss them and possibly come up with a workable solution.
Pete

I'm draining my Sprint OEM extended battery (2600 mAh) and will post the results.

sk63 said:
I'm draining my Sprint OEM extended battery (2600 mAh) and will post the results.
Click to expand...
Click to collapse
That will be an interesting comparison.
If my calculation of a 650mAh charge rate is correct then it should take a little over 4 hours to charge, but that could be affected by whether the phone is on or off and what processes and apps are running if it's on.
I'm particularly interested in whether it will fully-charge or whether a mAh or time limit will interrupt the charge cycle before that happens.
Pete

It finally died and I started charging it at 12:25 without turning it back on. Using the stock AC charger.
Anecdotally, I use the Current Widget and when charging it hovers around 650mAh. And when discharging it's usually under 400mAh and with the screen off, well under 100mAh.
I believe the widget monitors the current in/out of the battery and that while charging, the current needed to run the phone bypasses the battery directly so the widget doesn't register it. Though I would need a multimeter to confirm.
I've also got the stock battery I'm draining using a Hero. After the extended finishes charging them I'll swap and charge while the phone is on and compare the rate.
EDIT: Extended took almost exactly 4 hours charge. Now testing the charge rate of the stock battery with the phone on.

Glad to see someone doing this, as a lot of different information is posted on this board about batteries and charging.
I just wanted to add that when looking at current widget logs, the charging rate does seem to change depending on the battery life, as you get close to full the charging rate does seem to gradually decrease until it is quite low, at least according to current widget. I have seen other users say that it is only the last ten percent that the phone does this, but I can't be too sure as using my phone usually interrupts the log and such.
At least the current widget logs give some indication of the charging rate changing under different conditions, if not at least the phone using more or less current for these conditions.

sk63 said:
Anecdotally, I use the Current Widget and when charging it hovers around 650mAh.
~~~ snippo ~~~
EDIT: Extended took almost exactly 4 hours charge.
Click to expand...
Click to collapse
Boy, I hit those two nails right on the head didn't I? That's the nice thing about electricity: It can easily be predicted with mathematics.
I'll be looking as soon as I post this, but where does one find this "current widget" and does it run on a non-rooted phone?
And sk63: Almost exactly? Thanks for the info!
Pete

PGRtoo said:
And sk63: Almost exactly? Thanks for the info!
Pete
Click to expand...
Click to collapse
It was like 4 hours +/- 5 minutes missed the exact moment when the light when green.
Stock battery with phone turned on took close to four hours as well. Phone usage didn't seem particularly high, maybe there was an issue in swapping the batteries.

So I'm guessing the 800 ma aftermarket charging cable I bought would be sufficient?
** As a sidenote, I wonder if this 650 ma limitation is hardware or software enforced? If software enforced, could we turn it off to hit closer to 1 amp? Couldn't a developer write an app to fix this? If not an app, perhaps a kernel?
This is kind of like a CPU being rated at 3.0 Ghz when it can safely run at 3.8 Ghz by people that know what they are doing. The 650 ma limitation is just "idiot" proofing.

If current widget is accurate, when charging I've seen my log read up to 900mah, I always figured this was how much current going into the battery. The more I use the phone the lower it goes.
Sent from my PC36100 using Tapatalk

2:20 hours for a full charge? Dang, it only takes me about 1:27 to charge my dead battery to 100% with the phone on, stock battery.

Are you asking about higher mA chargers for the purpose of charging the stock OEM battery faster, or for being able to simply charge a higher capacity battery?
Does charging the battery faster have any negative or positive affects on the battery or battery life? Because I seem to remember posts talking about the differences between charger the evo with a stock battery from the wall charger vs charger from a usb on a computer. The wall charger would charge the battery much faster, but seemed to drain faster also. With the usb charger, charging took a longer time, but some were saying that it also lengthened the battery life (charge cycle). Now I don't remember if those were completely accurate results, but I suppose it made sense. But if it was true that a slower charge made for a longer battery life, whats really the difference? At that point, does it come down to battery/cell structure? Because electricity is electricity, for the charger its all dc. So how is the charging rate regulated when plugged into the computer?
These are just things that this thread has made me think of. My conclusion though, is that in regards to battery life, any fixes would all on the software side for now, at least if we are using the stock 1500mA battery. And every 10 people on this board have 15 different ways to increase battery life, whether through a certain rom or what-not.
I also read in another post, that battery technology is not advancing as fast as cellular technology is. So at the end of the day, we have an awesome phone that can literally do almost anything, shorter battery life was to be expected. But its no where near as bad as people were saying it was before june 6th (public launch date).

Just to throw in my .02 cents here...
The battery capacity of 1500mah is hardcoded into the evo's system.
This means that even the sprint extended battery suffers from the flaw of not being charged properly in the evo just like the seidios. I own the sprint extended and the seidios and they both demonstrate the same charging flaw while charging in the evo.
The hardcode is seen while the phone is on. While the phone is off it's possible there is some sort of hardware limitations imposed to keep the full battery capacity locked at 1500mah.
I have been looking into a way to possibly overwrite this hardcode on a rooted evo but so far my efforts have been null.

i believe temperature greatly effects charging and battery life as well.
my makita power tools have a 30 minute rapid charger and in order to get such quick charge times it uses a fan to cool the battery during the charge. the charger includes circuitry to slow down the charge rate if the temperature can't remain cool enough as well.
lithium ion batteries as well.
just shows ya, the batteries likely could charge much faster, but you'd have to incorporate some extra cooling so they don't get damaged.
i'd imagine the OP's assumption is about right.

jasongthang said:
But if it was true that a slower charge made for a longer battery life, whats really the difference? At that point, does it come down to battery/cell structure? Because electricity is electricity, for the charger its all dc. So how is the charging rate regulated when plugged into the computer?
Click to expand...
Click to collapse
The stock Evo battery pack contains a single 1500mAh 3.7V lithium-ion polymer (LiPo) cell. I haven't actually opened one up, but the larger "extended" battery packs probably contain a pair of 3.7V lithium-ion polymer cells wired in parallel which, for all practical purposes, is the electrical equivalent of a larger single cell.
Regardless, LiPo cells don't care whether you charge them slowly or quickly (within reason). There is no electrical or chemical reason why a LiPo that is charged slowly will release it's energy any differently than a LiPo that is charged quickly. The only difference might be that one which is constantly charged at a maximum rate may not be capable of as many charge-discharge cycles before it loses significant capacity. That, by the way, is what the phrase "cycle-life" refers to: The number of charge-discharge cycles a battery is capable of before it wears out.
And neither the internal charging circuit in the Evo or the Seidio external charger will charge a battery at anywhere near the most widely accepted maximum rate for a LiPo (1C). If they did they would charge a dead battery in about an hour.
Pete

Got LiPos?
Here are just a few of mine. The big ones are out in the hangar (garage).
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Pete

PGRtoo said:
Here are just a few of mine. The big ones are out in the hangar (garage).
Pete
Click to expand...
Click to collapse
Those deans plugs piss me off sometimes. R/C enthusiast I take it.

This chager charges my phone from 4% to %100 in exactly 3 hours.

So I just ordered this charger and it charged my phone from 4% to %100 percent in exactly 3 hours!
http://www.amazon.com/gp/product/B0051ZJA64/ref=oh_o00_s00_i00_details
Wow, what a great improvement over stock which takes 6+ hours. This makes me believe, that even though the stock output is rated at 1000ma and this charger's output is only rated 700ma that this charges works correctly!
If you have a 1800mah battery and you charge it at a rate of .7A, it should take it exactly 2.57 hours to charge, (1800/700). With stock it should take less, because 1800/1000 = 1.8 hours, but it takes 6+ hours to fully charge! Something is f'ed up with the stock charger or phone's software...

Yeah. About that. I just got my E4GT yesterday and noticed it does charge extra slow compared to my O.G. Epic.
My wife stayed with hers, maybe I will try charging my phone on hers. I wonder if that would make a difference...

Android Amateur said:
Yeah. About that. I just got my E4GT yesterday and noticed it does charge extra slow compared to my O.G. Epic.
My wife stayed with hers, maybe I will try charging my phone on hers. I wonder if that would make a difference...
Click to expand...
Click to collapse
At first my charging was extremely slow but now it'll charge from 2 to 100 in under three hours
Sent from my SPH-D710 using xda premium

I use the Palm charger from my TouchPad. Will go from dead to fully charged in about an hour and a half.

What's you TouchPad charger's output in mah? I think I might have to splice into a spare USB cable and check how much current is actually used by phone when on stock charger...pretty sure it is nowhere close to 1000mah.

2000mah is the output from the TP charger.

According to BatteryMonitorWidget, it estimates avg mA charging at 270mA using the stock charger that came with this particular phone.

I have my original charger from my Evo 4g and have noticed that it charges my phone a lot faster then the stock one that came with the phone. :-( weird
Sent from my SPH-D710 using Tapatalk

sfhub said:
According to BatteryMonitorWidget, it estimates avg mA charging at 270mA using the stock charger that came with this particular phone.
Click to expand...
Click to collapse
That sounds about right! I'll see if I can test this with my AMP meter tonight and tell you all for sure on stock vs new samsung charger that I've got.

awesomeindeed said:
2000mah is the output from the TP charger.
Click to expand...
Click to collapse
Yeah, at 2000mah it should charge in less than one hour...I would say your actual charge current to be around 1200mah...

i would be careful with these chargers.
i have dealt with a lot of Li-Po's in the past and there was a formula to how fast you should charge them.
i imagine it is the same deal with Li-On.
charging outside such formula could kill the life of your battery or worse.

Seems like i must have gotten lucky as a ton of people are having problems with their phone or chargers.
I just charged my battery from 0 to 100% off the stock charger in 2 and a half hours and i also havent gotten any of the dodgy input problems using the phone while charging.

I went back and took a longer look at the battery history when charging. When starting the charge at 65% it starts off around 828mA, then 540mA, then 360mA, so it looks like (as expected) the phone knows how much current to pull to charge the battery safely and it adjusts based on how full the battery is. Not saying it does this for the charger included with your phone, but that is the behavior for the charger included with this phone.
These are all estimates provided by Battery Monitor Widget because there is no real-time mA current meter in this phone (according to the author)

Ordered one of these. Stock charger takes a lifetime to charge the phone.

My GF got Nexus S 4G and it's stock charger also takes 6+ hours to charge, so there's something wrong with the chargers I guess...

The pins on this charger must me different than the stock charger. Just because the stock charger is rated up to 1Ah doesn't meant the phone or batteries circuitry allows that much output. The resistance and length of the USB pins on the cable are what determines the output of the charger. Simply using a different USB cable with the stock charger will get you faster charge times.
Using a 2Ah charger will get you nowhere, the circuitry doesn't allow that strong of a current. Just a bit of an FYI. Save your money and save your phone, use a different USB cable.
Also, how is the charge time holding up? I doubt you're getting a saturated charge with that charger.

SpaceMonky said:
i would be careful with these chargers.
i have dealt with a lot of Li-Po's in the past and there was a formula to how fast you should charge them.
i imagine it is the same deal with Li-On.
charging outside such formula could kill the life of your battery or worse.
Click to expand...
Click to collapse
Ive dealt with 1,2, and 3 cell lipos ranging from 150mah to 5000mah, and every one of them either say to be (or ive been told its recommended to do so) charged at 1C. so a 500mah battery should be charged at .5A, 1000mah at 1A, 5000mah at 5A, etc...
my lipo charger displays a bunch of info as the battery charges and it definitely drops the current as the battery gets closer to being fully charged. if its the same with li-on then I would imagine that .18A should be the most you would charge this battery, but Id rather it take a long time because unless things have changed recently, doesnt the slower you charge the battery prolong its life cycle as well as extend how long it lasts each charge? I only charge mine at night when I am sleeping so who cares if it takes longer than an hour. if I get into an emergency situation I have the cig lighter charger and in the worst case I even have one of those crank flashlights I can use to charge the phone in the event my car battery shorted out or something...

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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Sent from my SGH-T989 using Tapatalk

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 !
Click to expand...
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

Galaxy Nexus 3G charging time (with graph)

Hello *@*,
I intentionally discharged my GN to a battery level of 1% today to record the charging time just for myself. Then I thought: why not make a graph out of it and share it with XDA?
Total charging time (1% to 100%): 142 minutes
Level checked at 0, 30, 60, 90, 120, 125, 130, 135, 140 and 142 minutes
WiFi On, 3G On, Sync On, Screen Off, no calls/msgs/notifications received, phone not used except for % check
1750 mAh Samsung stock battery & charger

Stock or extended battery? I've noticed my charge time varies wildly. Most of the time it's on par with what you've listed here, but every once in a while it goes up 30% in like 20 mins.

Drewmungus said:
Stock or extended battery? I've noticed my charge time varies wildly. Most of the time it's on par with what you've listed here, but every once in a while it goes up 30% in like 20 mins.
Click to expand...
Click to collapse
3G, 1750 mAh stock battery. Sorry, I forgot about that.

Its so curious how the charge can be faster at the start

Rickymax said:
Its so curious how the charge can be faster at the start
Click to expand...
Click to collapse
Get a more powerful charger.... I'm using my playbook charger, which uses a 2.1 amp... Way faster than 142 mins... Mine takes about 1:30 to charge from 1% to full.
Sent from my Galaxy Nexus

Rickymax said:
Its so curious how the charge can be faster at the start
Click to expand...
Click to collapse
All capacitors acts this way (a battery is also a capacitor) the charge/discharge is always fsstest to 63% both ways and after that it slowes down.. this can ofcourse be monitored and controlled with soft or hardware. But this is the reality of capacitors
Sent from my Galaxy Nexus using xda premium

big samm said:
Get a more powerful charger.... I'm using my playbook charger, which uses a 2.1 amp... Way faster than 142 mins... Mine takes about 1:30 to charge from 1% to full.
Sent from my Galaxy Nexus
Click to expand...
Click to collapse
isnt it bad for the battery when it is not designed to receive charge that quickly?

All about charging LiIon batteries: http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
TL;DR:
LiIons are charged in two main stages:
- stage 1 with constant current, that's the fast charging rate for (roughly) the first 2/3 of the batteries capacity
- stage 2 with constant voltage and a tapered charge current for the last 1/3 of the batteries capacity, that's the slow part where the graph flattens
This is necessary because a LiIon battery is full at exactly 4.20 V and can not handle any overcharge. In fact at ~4.55 V (only + 0.35 V!) the battery would "vent with flame" aka explode.
If you wanna do this on purpose, this is what will happen: http://www.youtube.com/watch?v=YCWdnjLqVWw
Using a more powerful charger can work if the electronics inside the GN handle the higher current properly. I wouldn't recommend it, though. It may charge quicker but it will wear down your battery faster as well.

The phone can only draw up to 1A regardless of much higher the charger is.
So if you're buying a charger, don't bother paying extra for a 2A, but there is no harm in using a 2A charger if you already have one.

wonshikee said:
The phone can only draw up to 1A regardless of much higher the charger is.
So if you're buying a charger, don't bother paying extra for a 2A, but there is no harm in using a 2A charger if you already have one.
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But I can assure you that my phone charges faster with my Playbook charger than the regular charger that came with the phone... How many amp the regular charger uses?
Sent from my Galaxy Nexus

big samm said:
But I can assure you that my phone charges faster with my Playbook charger than the regular charger that came with the phone... How many amp the regular charger uses?
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Stock charger is 5V/1A (=5 watts). There may be some leeway built into the GN's charging electronics so it can utilize more than 5 watts, but you can safely assume that Samsung would have packaged this phone with a 10 watt charger if it was safe (or desirable in terms of charging time vs. battery durability). Charging time is an important aspect after all.

The phone can absolutely handle it. I think Samsung is just too cheap to give us a rapid charger, I mean there was enough space in the box.
Sent from my Galaxy Nexus

My car charger is a 2amp charger and does approximetly 1 percent a minute. At home I connect it to my HP Touchpad charger and it seems to charge really quick.
But I LOOOOOOVE my car charger as it can charge my Tablets and phones fast. Well worth the 30 bucks I spent at Best Buy for the rapid charger.

surely a 2amp charger is capable of providing 2amps, but if whatever is attached only drawers 1amp then that's what it'll get ? It doesn't force 2 amps down it's throat ? My palm pre 2 charger is 1amp, my touchpad has a 2 amp charger, but my palm pre doesn't charge any quicker using the touchpad charger.

My Gnex does charge really fast using the plug that came with it especially coming from galaxy s2 which takes ages for a full charge.

alphaola said:
My Gnex does charge really fast using the plug that came with it especially coming from galaxy s2 which takes ages for a full charge.
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+1 I found the gnex really fast charging compared to my sgs2. With the sgs2 I always had it plugged in for fear of a flat battery with the gnex the charging is so fast I don't care anymore.
Sent from my Galaxy Nexus using XDA App

AcE XBOX said:
My car charger is a 2amp charger and does approximetly 1 percent a minute. At home I connect it to my HP Touchpad charger and it seems to charge really quick.
But I LOOOOOOVE my car charger as it can charge my Tablets and phones fast. Well worth the 30 bucks I spent at Best Buy for the rapid charger.
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FYI, 1% a min is roughly 1A.
In 1 hour, it would restore 60%, 60% of 1.750A = 1.050A.
Nexus battery is the perfect size to eyeball the inflow rate.
30%/hr = .5A
60%/hr = 1A
60%/30min = 2A
If you think you're charging at 2A, simply time it. Also these are rough numbers and will only be accurate when the battery is low.

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)
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Sure it does

wyrman said:
Sure it does
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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)
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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
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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.
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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/
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Sorry you are correct

ChazzMatt said:
EXACTLY. NOT Lithium Ion.
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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.
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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.
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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!!