Hi all,
I know that on older phones the battery had to be emptied almost to 0% and the charge it to full. This was done for battery health or something?! Is the true for newer batteries?
Anyway I plan on buying a desktop dock, and i was wondering if it would damage my battery if i charge it when ever i can for random periods of time. Would this decrease my battery life time or in anyway damage it?
I think with this type of batteries you don't need to completely discharge and then recharge. In fact, that may harm the battery.
It's better to charge the battery whenever possible
yep ljesh is right
with lithium batteries that is not the case, i forget what the old batteries were called, but i think they began with a N..
You can't completely discharge these with normal usage since they have in-built lower end limits for protection.
-----------------------------------
- HTC Desire via XDA App -
You're talking about the memory effect.
The battery used in the Desire (Li-Ion/Li-Poly) does not have such a memory effect. (older did, like Ni-MH, Ni-Cd) So no, you don't have to and you shouldn't deeply discharge this type of battery.
Recharge it as soon as possible, as few as possible and let it charge till it's full without interrupting if possible.
Sometimes you'll read that you have to 'calibrate' the battery. You don't calibrate the battery, rather the charging controller, which estimates the battery capacity. Over the time this estimation can get wrong, thus you have to calibrate the controller by discharging the battery till it's empty and charging it till it's full (some do a few other tricks, too, however, it's only interesting if you have root). If you have issues with your battery (like shut-down at 10% or higher already) then consider such a calibration.
I have noticed that compared to my iPhone 4 charging the desire takes ages. Could it be because I am using a 3rd party wall charger?
Sent from my HTC Desire using XDA App
ste1164 said:
I have noticed that compared to my iPhone 4 charging the desire takes ages. Could it be because I am using a 3rd party wall charger?
Click to expand...
Click to collapse
yes!
The Desire can charge in two modes:
USB mode: Low current, can get charged from a normal 500mA USB port. Takes long
AC mode: High current, charges with 1A, only compatible AC adapters should be used.
How can the Desire detect what mode it can use:
If the Data+ and Data- lines in the USB cable are bridged, then it switches to AC mode, else it thinks it's connected to a USB hub or a device with max output of 0.5A.
So either get a AC Adapter which has those pins bridged, or modify a cable, or buy a USB cable which has those pins bridged already (don't know it exactly, but I think I've read that such a cable gets supplied by some HTC car adapter, but I don't know it for sure)
Just search about this topic, you'll find a lot of posts about it.
Thank you I will look for a proper chargeing cable.
Sent from my HTC Desire using XDA App
Yea this charger only outputs 500 mAh ill need to look for a better one.
Sent from my HTC Desire using XDA App
Thanks for all your replies
Related
I Was just wondering. What is the recommended watts during charging?
I got this cute solar panel pumping 0.4W and It's charging sloooowly. Is there a way to see how many mA/h your phone eats?
Sent from my HTC Desire using XDA App
Try *#*#4636#*#* on the phone key pad
might be in battery info
From my experience the desire needs about 700ma (3.5w) to charge efectivly (this is the least powerful charger I have that will charge the phone.).
Your solar panel is pumping out a whopping 80ma so I'm not surprised its not charging.
Use current widget (free on market) to see how much juice your using at any given time.
Don't forget no matter how powerfull a charger is it will only charge at 500ma unless the two data pins are shorted.
my original htc charger pumps in 760 -740ma when its completely dead and reduces the ma as the battery charge increases i.e 97% charge is about +120ma
For anyone using Android 4.0, specifically running it as stock on this device, do you experience the same battery drain issues commonly seen in Gingerbread? You know the one where the process Android OS uses an ungodly amount of battery life through suspend and events/0?
been playing around with the phone for the past 8 hours from a full charge, nothing unusual about the battery
tomorrow with normal usage after the full charge i'll get a better view about it
h9290 said:
been playing around with the phone for the past 8 hours from a full charge, nothing unusual about the battery
tomorrow with normal usage after the full charge i'll get a better view about it
Click to expand...
Click to collapse
Does it take long to charge the battery? Like the nexus s. If its a slow charging phone like the nexus s then im not buying.
didn't think that fully charging it toke that much
i usually leave the phone charge when i go to sleep
removed from a 100% charge at 9:15am GMT
I own Nexus S too and experience the same, slow charging ... using the charger from Samsung (default).
So, I changed the charger and I use the one that came with the HTC Desire
And it is much faster, like 3 hours to go fully charged compared to more than 5 hours.
So, there you go, change your charger!
sheek360 said:
Does it take long to charge the battery? Like the nexus s. If its a slow charging phone like the nexus s then im not buying.
Click to expand...
Click to collapse
I can usually get my nexus S to a full charge in an hour or two, depending on how empty I let it get. It's fast enough that if I've forgot to charge & need to go out a 20 minute blast will get me through the evening.
No idea who made the charger.. I've got a house full of the damned things these days
So what about life time?
Just check your chargers mA output, the higher the nr, the faster the charge. A computer USB port outputs 500mA wich gives a rather slow charge normal mA on chargers is around 700mA -> 1A. Keep in mind though that higher mA resulting in a faster charge puts more stress on your battery and it WILL get hotter, to high numbers can even damage your battery so be carefull and monitor your batterys temp when trying a new charger!
Sent from my X10i using xda premium
7:30 and the battery is on 58%
been using it since 9:15 off charge. browsing/gps/wifi and browsing
h9290 said:
didn't think that fully charging it toke that much
i usually leave the phone charge when i go to sleep
removed from a 100% charge at 9:15am GMT
Click to expand...
Click to collapse
h9290 said:
7:30 and the battery is on 58%
been using it since 9:15 off charge. browsing/gps/wifi and browsing
Click to expand...
Click to collapse
Wow! That sounds really really good tbh! Makes me really happy to hear :-D
Sent from my X10i using xda premium
Slightly off topic, but regarding charging...
Does charging via a "weaker" USB port damage the battery? For example, at work, the only USB port available is an old iMac keyboard USB port, and it's "weaker" in the sense that when I connect it to my phone, the computer tells me "A USB device needs more power.... "
I understand this might charge the battery slower, but does it cause any damage to it, short or long term?
onthecouchagain said:
Slightly off topic, but regarding charging...
Does charging via a "weaker" USB port damage the battery? For example, at work, the only USB port available is an old iMac keyboard USB port, and it's "weaker" in the sense that when I connect it to my phone, the computer tells me "A USB device needs more power.... "
I understand this might charge the battery slower, but does it cause any damage to it, short or long term?
Click to expand...
Click to collapse
As far as i know USB before 2.0 needed external power supply, meaning your device should not be able to charge from this type of USB. But to answer your question, no, you can not damage an electric device by undervoltage or lower Amps.
Sent from my X10i using xda premium
Hope to get the GN soon.
Like to see and test how the charging is with different chargers.
Have seen slow charging ( also better hold out ) with different chargers.
My best charging is stil with the original desire ( charges quick and battery holds longer ).
Galaxy S plus is slow, wildefire also slow...
When I first got this phone I noticed it charged pretty slow. 5 hours to get to full from 0% but it then got a lot worse. Over night it would only charge from like 18% to 41 so I got a new charger and wall adapter and that seemed to fix it for a couple days but now it is charging slow again. From 70% to 100 it takes about 6-7 hours. Anyone else experiencing this?
The only time I've heard of that happening is when people fail to 'condition' their lithium battery properly before normal use.
In other words, upon getting your new phone, and/or battery, you're suppose to allow your battery to fully discharge and then fully recharge 3-5 times to condition your battery before plugging it back in half way through discharge.
It's usually what the carrier sales clerks are suppose to tell you when purchasing a new smartphone.
Here's a simple article on the subject:
http://www.ehow.com/how_4797458_condition-cell-phone-battery.html
Sent from my SPH-L710 using xda app-developers app
drewmonge said:
The only time I've heard of that happening is when people fail to 'condition' their lithium battery properly before normal use.
In other words, upon getting your new phone, and/or battery, you're suppose to allow your battery to fully discharge and then fully recharge 3-5 times to condition your battery before plugging it back in half way through discharge.
It's usually what the carrier sales clerks are suppose to tell you when purchasing a new smartphone.
Here's a simple article on the subject:
http://www.ehow.com/how_4797458_condition-cell-phone-battery.html
Sent from my SPH-L710 using xda app-developers app
Click to expand...
Click to collapse
I never had/has/have doing it. And I dont have battery issues.
I think the battery calibration/cycle..etc is just a myth.
Go to the store and check for warranty.
Sent from my SPH-L710 using Tapatalk 2
Could it be a rouge app causing it to take so long to charge? I noticed today Google maps was using a lot more of the battery than usual. Almost as much as the screen. I tried force stopping but it just starts right back up again. Any ideas on how to fix the maps app? I have a feeling that is what is causing it.
I have this problem. It is very annoying and I have no idea what causes it. It doesn't happen all of the time though.
rbtrucking said:
Could it be a rouge app causing it to take so long to charge? I noticed today Google maps was using a lot more of the battery than usual. Almost as much as the screen. I tried force stopping but it just starts right back up again. Any ideas on how to fix the maps app? I have a feeling that is what is causing it.
Click to expand...
Click to collapse
Just sounds like a bad install of something. I would do a factory reset through the stock recovery, and make sure to wipe dalvik cache.
My phone has started charging slowed as well, but mostly when connected to the computer. I made sure my usb ports were set to not allow the computer to shut them off to conserve power and it seems a bit faster. As far as charging and discharging ect ect I don't do that and never had a problem with slow charging and even the couple of times I tried it, the battery life never really improved. So think it is needed and some think it is a waste of time.
Charging via a computer USB port will always be slow when compared to the higher current capacity of the included AC charger. Computer USB ports have a lower current rating.
Make sure your using the charger that came with the phone, not all chargers are created equally.
There's also been some talk about the quality of USB cable being used, but I haven't found that myself yet.
Little bit of info...
I have tried numerous chargers while at work here (Technician) and there are some issues.
Samsung is funny on which chargers it accepts. Very funny.
1. Stardard charger that comes with the device will charge best. (Obvious I know) Using wall charger. (Full charge in 3.5 to 4 hours from 1%)
a. Using USB end plugged into PC while charging takes typically from my tests double the time to charge. (I'm guessing that data connection to PC is slowing the charge. (Full charge in 6 hours from 1%)
2. 3rd Party Generic charge cables (usb cable only) still charges device however stardard power draw is lower and does not charge in a decent time period.
a. Some 3rd Party usb cables plugged into a pc showed charging however they did not keep enough of a draw to actually charge my phone. I lost battery instead of gaining.
3. LG chargers did nothing for me. Couldn't get a decent charge.
Motorola chargers gave me the best charge besides the original.
Chargers with replacement tips... what can I say. They didn't seem like a good idea and weren't. I had too many issues and at times had some overheating issues. Luck of the draw me thinks.
3rd party wall chargers were hit or miss. A few did seem to give me a decent charge, others gave me a very slow trickle charge taking anywhere up to 8-9 hours for a full charge from 1%
All in all... it's a crap shoot using 3rd party cables. It's all based on voltage output and Samsung likes to change things alot. You will still get a charge but who knows the length of time it will take.
Oh and car chargers... typically only good for keeping it at the same level you plugged it in at for short drives. Long drives obviously work much better.
Hope this helps.
About charging: I have noticed that micro USB cable that come with S3 is really bad - it is loosing a connection to PC,and, beside that, I have noticed several times slow phone charge... Accidentally went to settings- battery - when I was on AC charger and saw in settings that phone is actually charging in USB mode!!! Wtf??? Disconnect usb from bottom end (at charger side) and reconnect and then on phone says " charging - AC" ... So,conclusion is that you check your phone charging status when you put on charger,maybe it is charging in USB mode and because of that phone is charging slower than it should on regular AC power.
The only battery issue that i have noticed is when i use my computer to charge it takes forever but when i use the factory wall plug and cable it charges quickly with no issues
Excellent post supercholo. Really helpful. I was starting to think my phone was broken.
Anyone got any experience with using an ipad charger on an sIII. I know an ipad wants a lot of power to charge.
FYI These are the voltages listed on my chargers;
Apple ipad1 charger 5.1v 2.1a
SAMSUNG s3 wall charger 5v 1a
Samsung Galaxy i9000 wall charge 5v .7a
supercholo said:
Little bit of info...
I have tried numerous chargers while at work here (Technician) and there are some issues.
Samsung is funny on which chargers it accepts. Very funny.
1. Stardard charger that comes with the device will charge best. (Obvious I know) Using wall charger. (Full charge in 3.5 to 4 hours from 1%)
a. Using USB end plugged into PC while charging takes typically from my tests double the time to charge. (I'm guessing that data connection to PC is slowing the charge. (Full charge in 6 hours from 1%)
2. 3rd Party Generic charge cables (usb cable only) still charges device however stardard power draw is lower and does not charge in a decent time period.
a. Some 3rd Party usb cables plugged into a pc showed charging however they did not keep enough of a draw to actually charge my phone. I lost battery instead of gaining.
3. LG chargers did nothing for me. Couldn't get a decent charge.
Motorola chargers gave me the best charge besides the original.
Chargers with replacement tips... what can I say. They didn't seem like a good idea and weren't. I had too many issues and at times had some overheating issues. Luck of the draw me thinks.
3rd party wall chargers were hit or miss. A few did seem to give me a decent charge, others gave me a very slow trickle charge taking anywhere up to 8-9 hours for a full charge from 1%
All in all... it's a crap shoot using 3rd party cables. It's all based on voltage output and Samsung likes to change things alot. You will still get a charge but who knows the length of time it will take.
Oh and car chargers... typically only good for keeping it at the same level you plugged it in at for short drives. Long drives obviously work much better.
Hope this helps.
Click to expand...
Click to collapse
Very slow charging with OEM charger.. i9300
This is a fact. The OEM wall charger surely has some issues. Though 1amp output, as claimed on th specs chart, my i9300 charges super slow. From 80% to 100%, it takes nearly 3 hours.
So, i switched chargers and used my S2 and Note OEM wall chargers. And voila, the phone charges super fast. I even ordered a new OEM charger for s3 with the data cable included and the same issue occured.
This has worsened ever since the JB update. So I am now using the S2 charger and very satisfied.
SWTICH OVER GUYS!! OEM charger is useless,,,
I have had my phone on USB to computer charging for 7 hours, with a one hour break to watch Dexter. I was at 18% and I am now at 69%. I think I will have to use the wall adapter because this is just ridiculous.
Usb to pc will always be slow buddy. It outputs 500ma while d wall charger is 1 amp
I found my Usb cable faulty. Sent for replacement.
Cheers
→→Android▶◀▶◀ ROCKS!◆◆◆
Without reading all the post. I have had this same problem. Took phone to sprint, they tested the battery and it was bad. Got a new one and good to go..
Charging time for my battery is pretty slow. I takes more than 3 hours from 10% to full! It doesn't matter if it is chraging with the carger or via USB. Is this normal with the Nexus? I had Htc Inspire 4G, and the charging took 2 hours top!
*if i use the phone while charging e.g. play some game, the battery is still draining instead of charging.
Sent from my Galaxy Nexus using xda app-developers app
You should get better results with an A/C charger but I've seen some wall adapters still read as if its plugged in via USB. You can check by going to settings >> battery while it's plugged in and it should read A/C charging.
ordevski said:
Charging time for my battery is pretty slow. I takes more than 3 hours from 10% to full! It doesn't matter if it is chraging with the carger or via USB. Is this normal with the Nexus? I had Htc Inspire 4G, and the charging took 2 hours top!
*if i use the phone while charging e.g. play some game, the battery is still draining instead of charging.
Sent from my Galaxy Nexus using xda app-developers app
Click to expand...
Click to collapse
What is the max current (mA) the charger you use can provide? Divide the capacity of your battery (in mAh) by the charge current. That is your approximate charge time in hours. I believe most AC chargers can charge with 1A, so a stock GSM battery of 1750 mAh should take less than 2 hours from being discharged to fully charged. Mine does.
The behavior that the GNEX will discharge even while being charged with a non AC charger (including car chargers) when gaming/navigating is not uncommon.
3rdstring said:
You should get better results with an A/C charger but I've seen some wall adapters still read as if its plugged in via USB. You can check by going to settings >> battery while it's plugged in and it should read A/C charging.
Click to expand...
Click to collapse
Yes, it's reading A/C charging, but the charger is from alcatel with 400mAh output.
Petrovski80 said:
What is the max current (mA) the charger you use can provide? Divide the capacity of your battery (in mAh) by the charge current. That is your approximate charge time in hours. I believe most AC chargers can charge with 1A, so a stock GSM battery of 1750 mAh should take less than 2 hours from being discharged to fully charged. Mine does.
The behavior that the GNEX will discharge even while being charged with a non AC charger (including car chargers) when gaming/navigating is not uncommon.
Click to expand...
Click to collapse
I've been charging it with Alcatel charger with 400mAh output. I'll try with Samsung charger with 5.0V output which says it's equal to 0.7A because I don't have the original (I think i have used it before, but i dont recall that it was any faster).
Could be kernel related issue, since there is an option to "Fast charge" via USB and it's enabled?
ordevski said:
I've been charging it with Alcatel charger with 400mAh output. I'll try with Samsung charger with 5.0V output which says it's equal to 0.7A because I don't have the original (I think i have used it before, but i dont recall that it was any faster).
Could be kernel related issue, since there is an option to "Fast charge" via USB and it's enabled?
Click to expand...
Click to collapse
its not likely a kernel issue unless you are on some experimental one, but you would be able to easily find out by looking at the forum cause others would have the issue. And if you didn't know the Fast Charge option is to make your phone think its hooked up to a wall port if you are charging from your laptop or if your car charger is only being used a usb port thing.
jv2543 said:
its not likely a kernel issue unless you are on some experimental one, but you would be able to easily find out by looking at the forum cause others would have the issue. And if you didn't know the Fast Charge option is to make your phone think its hooked up to a wall port if you are charging from your laptop or if your car charger is only being used a usb port thing.
Click to expand...
Click to collapse
It's franco kernel, nightly 251, pretty stable from what i've read in the thread. Also, I know what does Fast Charge option do, but I thought that somehow it messed something up. While I was googling for answers, I found some forum, where was mentioned the battery chip that is regulating the power it's using to charge the battery could somehow get messed up. Maybe I have bad batt.
mine battery too takes 3 hours to full charge using stock samsung wall charger. I'm using stock rom and kernel.
Mines takes 1 hr 30 minutes tops with fast charge
Sent from my Galaxy Nexus using xda app-developers app
You are using a 400mA charger, the gnex comes with a 1A one. Go figure.
Beamed from Maguro
---------- Post added at 07:42 AM ---------- Previous post was at 07:38 AM ----------
Petrovski80 said:
What is the max current (mA) the charger you use can provide? Divide the capacity of your battery (in mAh) by the charge current. That is your approximate charge time in hours. I believe most AC chargers can charge with 1A, so a stock GSM battery of 1750 mAh should take less than 2 hours from being discharged to fully charged. Mine does.
The behavior that the GNEX will discharge even while being charged with a non AC charger (including car chargers) when gaming/navigating is not uncommon.
Click to expand...
Click to collapse
That is because the car charger most likely did not short both the data pins out, therefore you notice the discharging phenomenon because the phone will only take in 500mA without the data pins shorted or with kernel fast charge enabled. How is 500mA going to keep up with navigation, GPS and all other tasks?
Beamed from Maguro
Also realize that your previous phones battery probably had a lower capacity than the gnex therefore coming from 2 hours, 3 hours isn't that bad for charging a bigger battery
Sent from my Galaxy Nexus using xda premium
ordevski said:
Charging time for my battery is pretty slow. I takes more than 3 hours from 10% to full! It doesn't matter if it is chraging with the carger or via USB. Is this normal with the Nexus? I had Htc Inspire 4G, and the charging took 2 hours top!
*if i use the phone while charging e.g. play some game, the battery is still draining instead of charging.
Sent from my Galaxy Nexus using xda app-developers app
Click to expand...
Click to collapse
I don't recommend using another charger I used a galaxy infuse 4g charger and in a week my battery got so hot it didnt even charge anymore
Sent from my Galaxy Nexus using xda premium
As has been stated get a GOOD quality charger. I might be weird but both my car charger and spare outlet charger came from Verizon. At least when i have had something not work they have been more than happy to open another and fully test in store for however long it takes. Sadly, my last car charger broke and I am too lazy to get another, my solution was to use a car inverter since I charge my other devices regularly on long trips. Plugging in a regular wall outlet from, oddly enough Motorola, does the job just fine. Alas, the majority of chargers my coworkers leave out are for lesser phones and will not even register on my beastly Nexus.
However i think i damaged my charger (original 1Ampere samsung wall charger) when i've been in Malta (i'm from Italy) last August. Before the holyday my nexus charged in 2 hours or less. During the holyday the charger heated a lot more than when using at home and now the charging process lasts about 3 hours. Also, when i connect the charger to the wall (even if the phone is unplugged) i hear a low almost-ultrasonic whistle.
I hope the damage isn't the battery.
Il_Tene said:
However i think i damaged my charger (original 1Ampere samsung wall charger) when i've been in Malta (i'm from Italy) last August. Before the holyday my nexus charged in 2 hours or less. During the holyday the charger heated a lot more than when using at home and now the charging process lasts about 3 hours. Also, when i connect the charger to the wall (even if the phone is unplugged) i hear a low almost-ultrasonic whistle.
I hope the damage isn't the battery.
Click to expand...
Click to collapse
I have the same problems too. I tried to use other charger, but the problem still remain. My charging process lasts about 2.30 h to charge from 55% to 100%. I really hate this because I need to charghe my phone faster. Please help us. (I'm italian too).
Ginuzzo50 said:
I have the same problems too. I tried to use other charger, but the problem still remain. My charging process lasts about 2.30 h to charge from 55% to 100%. I really hate this because I need to charghe my phone faster. Please help us. (I'm italian too).
Click to expand...
Click to collapse
Same problem here with another charger, and also via USB with Fast Charge enabled!
ordevski said:
Same problem here with another charger, and also via USB with Fast Charge enabled!
Click to expand...
Click to collapse
Where did you find the settings to set the Fast Charge?
Ginuzzo50 said:
Where did you find the settings to set the Fast Charge?
Click to expand...
Click to collapse
With a custom kernel.
Ginuzzo50 said:
Where did you find the settings to set the Fast Charge?
Click to expand...
Click to collapse
I'm using CodenameAndroid ROM, which has kernel that allows you to enable Fast Charge. It's located in Settings --> Performance --> Kernel controls --> USB fast charge
you tslees
ordevski said:
I'm using CodenameAndroid ROM, which has kernel that allows you to enable Fast Charge. It's located in Settings --> Performance --> Kernel controls --> USB fast charge
Click to expand...
Click to collapse
Thank you very much. And the effective result is really a faster charging? Does it works good or not?
Hello
I have a official nexus charger with ratings 2.0 A. My Phone was charging a bit slow so I tried different chargers with Nexus/phones to check the mA ratings with this application.
Current Widget : Battery Monitor
I am getting about 1000 mA from Nexus charger of 2 A while 750-770 mA from my phone charger which is 0.850 A.
Do you think I have a problem with my Nexus charger ?
Can anyone use the widget (drag from widgets to home while charging and set update interval at 1s) and share results what are you getting ?
I would be very thankful!
Update : My new nexus charger has 1.35 and gives 1.1A while my phone charger of .850 A gives 750mA.
Nexus 7 2012 gives 1.7-2.0 A
Hnk1 said:
Hello
I have a official nexus charger with ratings 2.0 A. My Phone was charging a bit slow so I tried different chargers with Nexus/phones to check the mA ratings with this application.
Current Widget : Battery Monitor
I am getting about 1000 mA from Nexus charger of 2 A while 750-770 mA from my phone charger which is 0.850 A.
Do you think I have a problem with my Nexus charger ?
Can anyone use the widget (drag from widgets to home while charging and set update interval at 1s) and share results what are you getting ?
I would be very thankful!
Click to expand...
Click to collapse
Did you try your experiment with a dedicated charging cable?
If I understand the issue correctly, using a sync cable for charging redirects some of the charging current for other purposes.
douger1957 said:
Did you try your experiment with a dedicated charging cable?
If I understand the issue correctly, using a sync cable for charging redirects some of the charging current for other purposes.
Click to expand...
Click to collapse
No, I havenot. Just the official Nexus cables and Xperia Cable. Xperia has built in fast charging as far as I know
Hnk1 said:
No, I havenot. Just the official Nexus cables and Xperia Cable. Xperia has built in fast charging as far as I know
Click to expand...
Click to collapse
What those cords do is short pins 2 and 3 together allowing your tablet to command more current which will charge the battery faster if you have a charging brick with more Watts (power.) Bricks like the Asus and Amazon fast chargers for instance. More Watts means more current can be supplied at the same voltage. (P=I*V)
That said, you don't want to heat that battery to much. 700mA - 800mA is a great charge. I charge my tablet in 4 hours or less with that. You can also open your brick and short the pins but the cord is cheap enough.
Sent from my Nexus 7 Flo running CM 11 4.4.2 with ElementalX Kernel using XDA Premium 4 mobile app
LinearEquation said:
What those cords do is short pins 2 and 3 together allowing your tablet to command more current which will charge the battery faster if you have a charging brick with more Watts (power.) Bricks like the Asus and Amazon fast chargers for instance. More Watts means more current can be supplied at the same voltage. (P=I*V)
That said, you don't want to heat that battery to much. 700mA - 800mA is a great charge. I charge my tablet in 4 hours or less with that. You can also open your brick and short the pins but the cord is cheap enough.
Sent from my Nexus 7 Flo running CM 11 4.4.2 with ElementalX Kernel using XDA Premium 4 mobile app
Click to expand...
Click to collapse
But try to charge N7 in car while using GPS with 700mA-800mA car adapter. You will get discharging, not charging, so you must use 2000mA. I recommend to use 2.1A for car(I am traveling a lot and never got disappointed), and normal 2.0 for AC charging.(5.0V)
Sent from my Nexus 7 using XDA Premium 4 mobile app
milleringer said:
But try to charge N7 in car while using GPS with 700mA-800mA car adapter. You will get discharging, not charging, so you must use 2000mA. I recommend to use 2.1A for car(I am traveling a lot and never got disappointed), and normal 2.0 for AC charging.(5.0V)
Sent from my Nexus 7 using XDA Premium 4 mobile app
Click to expand...
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The OP did not specify with GPS in the car. But for that I use this in the car while storm chasing http://www.amazon.com/gp/product/B0088U4YAG/ref=oh_details_o04_s00_i00?ie=UTF8&psc=1 20 Watt 4.2 Amp. I use GPS all the time and the Asus and Amazon bricks charge just fine while using GPS.
Still the tablet has to command the Amps it wants. This is decided in part by the Watts in the charging adaptor/brick. You can have a power supply with all the current capabilities in the world and it won't mean a thing without Power, Voltage and demand for Amps from said tablet/phone.
Sent from my Nexus 7 Flo running CM 11 4.4.2 with ElementalX Kernel using XDA Premium 4 mobile app
LinearEquation said:
What those cords do is short pins 2 and 3 together allowing your tablet to command more current which will charge the battery faster if you have a charging brick with more Watts (power.) Bricks like the Asus and Amazon fast chargers for instance. More Watts means more current can be supplied at the same voltage. (P=I*V)
That said, you don't want to heat that battery to much. 700mA - 800mA is a great charge. I charge my tablet in 4 hours or less with that. You can also open your brick and short the pins but the cord is cheap enough.
Sent from my Nexus 7 Flo running CM 11 4.4.2 with ElementalX Kernel using XDA Premium 4 mobile app
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I don't believe that's possible. It's my understanding that charging circuits are "smart," in that they'll "take" a voltage and current that tends to maximize battery life and endurance, with thermal limiting to guard against overheating. I think the profile is for the current and voltage to taper off a bit as the battery reaches full charge. Some devices do this better than others, but that's the basic principle.
The charger itself is regulated. The regulator maintains a set voltage, in this case 5.0 VDC. As the device's power requirements increase, the decrease in voltage at the regulator allows an increase in current to maintain the set voltage. Once the device's draw reaches the capacity of the charger, the battery takes over, because the charger can no longer maintain the required voltage. In other words, a 2 amp charger isn't constantly shooting 2 amps to the device unless the device is demanding that much current.
On the subject of chargers, we're not talking about laboratory grade here. Your 2 amp charger may or may not be able to actually produce 2 amps, much as the actual output voltage may not be exactly five volts. It's also important to note in the discussion that device batteries aren't rated at five volts, but something less. 4.5-4.7 is a common range.
Hnk1 said:
Hello
I have a official nexus charger with ratings 2.0 A. My Phone was charging a bit slow so I tried different chargers with Nexus/phones to check the mA ratings with this application.
Current Widget : Battery Monitor
I am getting about 1000 mA from Nexus charger of 2 A while 750-770 mA from my phone charger which is 0.850 A.
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Are you sure your Nexus charger is 2.0A? I think the 2012 charger was rated for 2A out, but my Nex7 (2013) charger lists 1.35A output on its nameplate.
Either way, could be that the 2013 Nex7 is configured not to draw a lot of current, generally this is for thermal management.
LinearEquation said:
0
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milleringer said:
1
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douger1957 said:
2
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arkolbus said:
Are you sure your Nexus charger is 2.0A? I think the 2012 charger was rated for 2A out, but my Nex7 (2013) charger lists 1.35A output on its nameplate.
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First of all,I didn't realise I was using new nexus charger (1.35A) and I thought it was the old charger (2.1A). So that cleared the doubts if my chargers were faulty.
I did few tests, asked my dad who is an Electrical Engineer and came to the following conclusions.
When I'm charging my phone/tablet ; say I'm using 1A, the power given would be around 850-900mA . The power be always less than rated.
If I'm using my phone and charging with same 1A charger, and the power used by my phone is 500mA, I would only see 350-400mA power given to battery as net because the power given would be subtracted from power being used.
Using a 2A charger would charge the battery more quicker, about 2x but it would reduce the life span of battery as well and may damage the device.
As more battery is being charged, more amounts of electrons would be present inside battery so the flow of current would start to decrease slowly . (So it would take more time to charge in the end.)
If charge power is less than usage of device, you would see discharge of device. In this case using a high power charger would charge the device but still it would damage the battery.
Basically, there is a safety factor of a device/battery. So if more current flows into it, lets say it can withstand 1.2 A and came with 1A charger. Using 1.3A or higher would damage the device/battery nonetheless.
I hope this helps and thank you for all your opinions and suggestions
Hnk1 said:
First of all,I didn't realise I was using new nexus charger (1.35A) and I thought it was the old charger (2.1A). So that cleared the doubts if my chargers were faulty.
Using a 2A charger would charge the battery more quicker, about 2x but it would reduce the life span of battery as well and may damage the device.
As more battery is being charged, more amounts of electrons would be present inside battery so the flow of current would start to decrease slowly . (So it would take more time to charge in the end.)
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Glad we got to the root of your issue.
There are a couple of misconceptions though:
All things being equal, you are correct that charging at higher current will produce more heat and will generally reduce battery lifespan. It is not likely that you will damage the device by using a higher-capacity charger (unless it is some cheap knock-off charger, but those are dangerous regardless of capacity). The charger is not "constant current", meaning it does not always supply the full current, only what the device requests. Some of the supply current gets used to power the device, and some goes to the charging circuit.
The charging circuit limits the amount of current going to the battery based on how full the battery is (fast charge up to a certain charge % or cell voltage, then slow charge to ~100%), the battery temperature (if temperature is too high, reduce charge rate), and some maximum current (depending on the charge circuitry, battery ratings, design decisions, etc). edit: If you use a (quality) 2A charger, one of two things will happen: either your device will charge faster and you may reduce your battery lifespan, or the charging circuit will still limit the current to some lower limit (like 1.35A), and nothing will change. You are not really at any risk of causing device failure.
Also, there are not "more electrons" in the battery. The number of electrons stays the same, since current must flow in a loop. What changes is the energy state of those electrons. When slow-charging (constant voltage charging), as the battery is charged its voltage rises towards the constant charging voltage. The difference between the charging voltage and the battery voltage drives the amount of current, so as that difference gets smaller the amount of current decreases towards zero per ohm's law.
Hnk1 said:
First of all,I didn't realise I was using new nexus charger (1.35A) and I thought it was the old charger (2.1A). So that cleared the doubts if my chargers were faulty.
I did few tests, asked my dad who is an Electrical Engineer and came to the following conclusions.
When I'm charging my phone/tablet ; say I'm using 1A, the power given would be around 850-900mA . The power be always less than rated.
If I'm using my phone and charging with same 1A charger, and the power used by my phone is 500mA, I would only see 350-400mA power given to battery as net because the power given would be subtracted from power being used.
Using a 2A charger would charge the battery more quicker, about 2x but it would reduce the life span of battery as well and may damage the device.
As more battery is being charged, more amounts of electrons would be present inside battery so the flow of current would start to decrease slowly . (So it would take more time to charge in the end.)
If charge power is less than usage of device, you would see discharge of device. In this case using a high power charger would charge the device but still it would damage the battery.
Basically, there is a safety factor of a device/battery. So if more current flows into it, lets say it can withstand 1.2 A and came with 1A charger. Using 1.3A or higher would damage the device/battery nonetheless.
I hope this helps and thank you for all your opinions and suggestions
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I think that would be true... if there weren't a charging profile built into the unit. That profile has the most "juice" going to the battery below a certain charge state. It tapers off as the battery reaches the fully charged state. On some newer devices the batteries contain electronics that help things along. There is certainly thermal limits built in, and at any rate, on higher quality devices at least, only so much current is used for charging. It'll charge at whatever current level the manufacturer has designed and no more, even if more current is available.
And you're correct in that while the device is charging, some current is used for charging while surplus current, if available goes to the running device. Once the device's battery reaches a full charge, the full charger current is available to run the device. If the charger is capable of providing the current needed to serve the device's needs, life is good. Otherwise, the cycle begins again.
Generally speaking, so long as you're not flogging your device by taxing the CPU and or GPU, a 2 amp charger should be sufficient to run say, a music program and a nav program using the GPS. Plug an OTG cable in and start hanging peripherals off of the dongle and all bets are off.