Develop Bugs

Battery charging BUG

Hi every one,
As far i know, there is a BUG on every official ROM for European GSM Touch Pro2.
When your battery get full charged and keeping it plugged to the wallcharger, then your Pro2 start taking the power from your battery and NOT from the charger.
This can be checked by yourself and you will see that even with it connected, the battery in running down charge, till you unplug it and plug it again after some minutes/seconds.

Yeah, I have noticed it as well. Anyone have a solution?

Not a bug. LiPoly's do not like being trickle charged, therefore the charger turns off.
I have not verified it on the TP2 but I suspect that if you let it sit long enough the battery level would drop to some level and the charger would charge it back to 100%.

This is a rather good new if it can manage battery loads cycles...

khaytsus said:
Not a bug. LiPoly's do not like being trickle charged, therefore the charger turns off.
I have not verified it on the TP2 but I suspect that if you let it sit long enough the battery level would drop to some level and the charger would charge it back to 100%.
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Click to collapse
It oughta turn the charger off and run the device from the mains, though, not from the battery. Is it doing that?

godefroi said:
It oughta turn the charger off and run the device from the mains, though, not from the battery. Is it doing that?
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Click to collapse
No it is NOT doing that, so to me it is a BUG.

just thought i would add this
for some reason on saturday i charged my phone via usb/pc and it lasted less than 24 hrs
so on sunday i drained it and charged it vis the plug
its still going noe
72 hrs 23 mins in stanby 30 mins talk and 4 hrs 7 mins use since 17.43 on 18/10/09
is never been this good so i thought it may be the new rom

http://www.batteryuniversity.com/partone-21.htm
Lithium-ion
(Li-ion)
Do charge the battery often. The battery lasts longer with partial rather than full discharges.
Do not use if pack gets hot during charge. Check also charger.
Charge methods: Constant voltage to 4.20V/cell (typical). No trickle-charge when full. Li-ion may remain in the charger (no memory). Battery must remain cool. No fast-charge possible.
Rapid charge = 3h
also i have read some where on xda that once it reaches 100% it'll stop charging

godefroi said:
It oughta turn the charger off and run the device from the mains, though, not from the battery. Is it doing that?
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Click to collapse
You know of any other modern phone that runs off the mains without the battery? None of my last three phones would without the battery.

khaytsus said:
You know of any other modern phone that runs off the mains without the battery? None of my last three phones would without the battery.
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Click to collapse
My Kaiser will. It turns off when you pull the battery, but you can turn it right back on.

Every one is talking about battery and it's components but no one speaks about that with charger pluged in, it should supply power and by pass the battery once it is fully charged like others models do.

sounds like you all need to do warranty exchanges for that lol

Tallpap said:
sounds like you all need to do warranty exchanges for that lol
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Click to collapse
No, what we need is that HTC do what we paid for.

User22 said:
Every one is talking about battery and it's components but no one speaks about that with charger pluged in, it should supply power and by pass the battery once it is fully charged like others models do.
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Click to collapse
http://forum.xda-developers.com/showthread.php?t=571606 some people here probably would help
xnifex said:
it's true, once the TP2 hits 100% it stops charging the battery & the usage time will kick in.
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Click to collapse
and on this thread http://forum.xda-developers.com/showthread.php?t=573037&page=4 which a guy says
mattdoyal said:
Just tried my TP2 without the battery and plugged, didn't power on. Why would they take away the ability to power on while plugged in but with the battery removed?? This was and would be a great troubleshooting step. Hey HTC, start building our phones with this option!!
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i hope this helps

Have in mind that once the battery is fully charged, it never go to charge again till you unplug the cable of your wall/car charger... so what will hapen then???

hello anyone know about the issue with the battery ok when i charge my euro tp2 all night and when i go to start>settings>all settings>system>power i then click on the infomation tab and under last full charge i get "not applicable" and get 0 hours and 0minute for the rest
im running the offical htc 6.5 rom

To me this sounds CRAZY. So people are saying that when the device is fully charged it starts to use its battery, thats just crazy... So basically charging it overnight leaves you with "almost" full battery in the morning...
I havent noticed anything out of the ordinary, and every morning when I come and take my device from the charger the charging light is green (opposed to the orange when started charging) and the battery shows to be 100% full.
I will check this again in the morning as I havent really paid 10000% attention to it, but I think I would have noticed the weird behaviour…

noticed this since day 1. my dash didnt do this. i did notice that a soft reset will resume the charge.

This is normal behavior for battery powered devices.
When it's plugged in, the charge circuit charges the battery.
The device itself always runs off the battery when it's available, this is why some devices won't power on without the battery installed, and many devices won't power on with a failed battery installed.
Laptops do the same thing, though they can switch to AC only without losing their state.
It's a holdover I think from when electronics couldn't switch between power sources fast enough to not lose anything (I remember the original game boy would reset no matter what if you tried to switch between batt and AC). It's possible that cell phones can't make this transition since there isn't really extra space to stuff in the bits that allow this (some large-ish caps).
I've also heard that this reduces wear on the electronics, because the voltage is more reliable, but I've never seen that documented.

kay7 said:
The device itself always runs off the battery when it's available, this is why some devices won't power on without the battery installed, and many devices won't power on with a failed battery installed.
Laptops do the same thing, though they can switch to AC only without losing their state.
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I don't think this is true for (modern) laptops. All the macbooks and thinkpads that I've owned had a feature that if you plug it in while the battery is above X% (usually around 96) it will not charge. It even gives a message saying "Not Charging" in the battery status. The battery percentage then stays constant no matter how long I use the laptop, so it is not DIScharging either. Therefore it must be running from AC. If it can do that, I doubt they would have it run off the battery as soon as it is charged to 100% on a full charge cycle. I think any time AC is plugged in, a modern laptop will run from AC rather than battery, regardless of whether it is currently charging the battery. However, that's just my theory from personal observations.

Battery calibration?

Wheres that one thread with the official email response to how to calibrate evo battery? Why isn't that thread stickied? I'm charging my phone right now and I forgot what to do..

If you mean the trick where you charge the phone to 100%, then turn it off, unplug, plug back in until green, unplug, plug back in till green, do that 5 more times, wave your hand over the phone while patting your belly, then unplug and plug in like 10 more times... well thats it
or if you mean battery stat calibration: charge to 100% boot into recovery, wipe battery stats, then reboot and do not plug in till your phone forces a shutdown

this is what your looking for...
elegantai said:
If you mean the trick where you charge the phone to 100%, then turn it off, unplug, plug back in until green, unplug, plug back in till green, do that 5 more times, wave your hand over the phone while patting your belly, then unplug and plug in like 10 more times... well thats it
or if you mean battery stat calibration: charge to 100% boot into recovery, wipe battery stats, then reboot and do not plug in till your phone forces a shutdown
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Click to collapse
i think he is talking about this: http://forum.xda-developers.com/showthread.php?t=712990

elegantai said:
If you mean the trick where you charge the phone to 100%, then turn it off, unplug, plug back in until green, unplug, plug back in till green, do that 5 more times, wave your hand over the phone while patting your belly, then unplug and plug in like 10 more times... well thats it
or if you mean battery stat calibration: charge to 100% boot into recovery, wipe battery stats, then reboot and do not plug in till your phone forces a shutdown
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Click to collapse
deonjahy said:
i think he is talking about this: http://forum.xda-developers.com/showthread.php?t=712990
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Click to collapse
1) Turn your device ON and Charge the device for 8 hours or more 2) Unplug the device and Turn the phone OFF and charge for 1 hour 3) Unplug the device Turn ON wait 2 minutes and Turn OFF and charge for another hour
yes also have to try thebatterystatewipe too

How often should you need to calibrate using this method?

elegantai said:
If you mean the trick where you charge the phone to 100%, then turn it off, unplug, plug back in until green, unplug, plug back in till green, do that 5 more times, wave your hand over the phone while patting your belly, then unplug and plug in like 10 more times... well thats it
or if you mean battery stat calibration: charge to 100% boot into recovery, wipe battery stats, then reboot and do not plug in till your phone forces a shutdown
Click to expand...
Click to collapse
I think patting my belly was what made my battery last longer

ElAguila said:
How often should you need to calibrate using this method?
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Honestly I wouldn't worry about doing any battery calibration. Battery calibration reminds me of breaking in a barrel on a new rifle. If you talk to 20 different people you will receive 20 different methods of doing the task. Generally if there isn't a single known method with proven results you can attribute the method to the placebo effect.
One thing I always wonder about these battery calibration methods is how the tests were performed. A lot of the time people will claim improved battery life but there is often another explanation for the increase in battery life, they rebooted the phone. If there was a process running amok it could very well have lowered their battery life and rebooting the phone simply killed the process thus improving battery life.
Personally I've never done anything special to calibrate the battery on any device I've owned and I've not have battery life problems. In fact when comparing the battery life of my devices vs. my friends who spent a lot of time calibrating we end up having almost identical time in which we can run on battery.
Just my two cents.

I don't really think it improves the battery so much as it makes it give you a proper reading. Mine can say the battery is down to 30% but it charges really fast. So I think it is an issue of reading the battery level properly.

doesn't charging like this deteriorate battery life? you keep pushing and pushing more volts into your battery. I think its better to do a full charge/discharge cycle a few times a week.

You only do it like this once and not every time. Also I have heard that with the lithium ion batteries you don't want to drain them completely or they may not charge up.

evo4gfan said:
doesn't charging like this deteriorate battery life? you keep pushing and pushing more volts into your battery. I think its better to do a full charge/discharge cycle a few times a week.
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Not with lithium ion. IN fact with li-ion/li-poly batteries, discharging them completely can kill them instantly.
ElAguila said:
I don't really think it improves the battery so much as it makes it give you a proper reading. Mine can say the battery is down to 30% but it charges really fast. So I think it is an issue of reading the battery level properly.
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Exactly. It is all about being able to read the battery at 100 percent when it is actually at 100% that way the meter goes down properly percentage wise and you don't lose 20 percent in the first 10 minutes after you unplug the damn phone lol. But the said method does in fact fix this problem. You should after doing the method listed on my website, or mentioned in the email from htc, see less of a drop after removing the charger.

skydeaner said:
Not with lithium ion. IN fact with li-ion/li-poly batteries, discharging them completely can kill them instantly.
Exactly. It is all about being able to read the battery at 100 percent when it is actually at 100% that way the meter goes down properly percentage wise and you don't lose 20 percent in the first 10 minutes after you unplug the damn phone lol. But the said method does in fact fix this problem. You should after doing the method listed on my website, or mentioned in the email from htc, see less of a drop after removing the charger.
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thanks for clarifying.

[REQ] App to Measure True Battery Charging Level

As you all know, the Evo battery charging mechanism is very quirky. If you are using the stock battery, the mechanism is not THAT bad once you understand how it works. If, like me, you are using the 3500 battery, charging the battery in the Evo is pretty much futile. Reason being, for some reason the Evo still thinks it is charging the stock battery despite the fact that you have a battery that is 2.5 the capacity in it. What this means is, the fully charged green light comes on at about the 65% level and you ultimately have to play a guessing game as to when the battery is actually charged. This is also after calibrating and wiping stats and doing whatever dumb HTC/sprint charging "trick" out there.
I am pleading here for someone to create an app that measures the true capacity and charge level of the battery so that we can all, especially extended battery users, know when the battery is actually fully charged. I am positive that there are donations in the project as this app will benefit all Evo users.
Please help and thanks in advance.

+1
I've been looking at the 3500mAh batteries as well, would love to get one, but i flat refuse to pry open my Evo everytime I want a FULL charge (having to resort to wall charging)
I'm not an expert in electrical engineering at all but I'm going to make an educated guess that the charging circuitry is independant of anything that the OS itself can control. Even with the phone 100% off it still has to obey the "rules" of charging that HTC setup. (i.e. charging to 100% then running off battery till it hits 90%) So I don't see how there can be an easy workaround for extended battery users if they want a true 100% charge.
I'd love a bit more juice myself, but like I said the only time I want to have to open up the back is if im upgrading my mSD card. If and until someone can come up with a solution, hell yeah! Until then I will just play with juice defender and hone my battery saving ability via software

I know the Battery Time app you can put in how big your battery is. Just select other when choosing your phone.
Sent from my PC36100 using XDA App

in for progress on this.
so tell me even though the phone thinks the battery is charged, does it stop charging it too?

If I remember correctly that may have to be done in the ROM/kernel, there is most likely a charging timer somewhere in there that stops it for safety reasons.
When changing the timer remember that the batteries are actually closer to 2800mAh than 3500, you don't want to overcharge it.
http://batteryboss.org/

Jsimon9633 said:
in for progress on this.
so tell me even though the phone thinks the battery is charged, does it stop charging it too?
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No it continues to charge which is even more nonsensical and adds to the frustrating guessing game. Seidio recommends that you keep the phone on the charger for 2-3 hours passed the time that the light turns green. Again, more guess work.
xHausx said:
If I remember correctly that may have to be done in the ROM/kernel, there is most likely a charging timer somewhere in there that stops it for safety reasons.
When changing the timer remember that the batteries are actually closer to 2800mAh than 3500, you don't want to overcharge it.
http://batteryboss.org/
Click to expand...
Click to collapse
I think you are referring to wiping battery stats. I have tried this on several Roms and kernels to no avail. Also, if you aren't rooted, how would you go about wiping stats? An app would help a lot of people out.
Also after doing some more research and testing, any app that provides battery level that I have used including OS monitor, spare parts, etc. will basically spit out what the OS is telling it and not measure the true level. Unfortunatley, the OS is stuck on stupid and we are back to the original issue.

MSmith1 said:
I think you are referring to wiping battery stats. I have tried this on several Roms and kernels to no avail. Also, if you aren't rooted, how would you go about wiping stats? An app would help a lot of people out.
Also after doing some more research and testing, any app that provides battery level that I have used including OS monitor, spare parts, etc. will basically spit out what the OS is telling it and not measure the true level. Unfortunatley, the OS is stuck on stupid and we are back to the original issue.
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Click to collapse
I don't believe it is possible for an app to do what you are wanting, the charging process is controlled by the operating system itself and is built into the kernel.
There are two main steps to charging a li-ion and the first one finishes when the battery is around 70% full. So either something is causing the phone not to start the second part of the process, it is just timing out thinking that battery should have been by that time, or, since the batteries have circuitry inside of them, it could be the battery itself that is doing it. Have you tried charging your phone through your USB port? It takes longer but the battery may not like how much power the wall charger pushes through it.
Edit: I think I misread your OP, does your phone stop charging when it says it's full or does it keep charging?

xHausx said:
I don't believe it is possible for an app to do what you are wanting, the charging process is controlled by the operating system itself and is built into the kernel.
There are two main steps to charging a li-ion and the first one finishes when the battery is around 70% full. So either something is causing the phone not to start the second part of the process, it is just timing out thinking that battery should have been by that time, or, since the batteries have circuitry inside of them, it could be the battery itself that is doing it. Have you tried charging your phone through your USB port? It takes longer but the battery may not like how much power the wall charger pushes through it.
Edit: I think I misread your OP, does your phone stop charging when it says it's full or does it keep charging?
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Click to collapse
The phone continues to charge. Based on what you are saying and my own findings, it seems the phone is reporting that initial charge at 70% as 100% when using the 3500 battery.
I am in the midst of testing some things right now related to all of this and will report back.

MSmith1 said:
The phone continues to charge. Based on what you are saying and my own findings, it seems the phone is reporting that initial charge at 70% as 100% when using the 3500 battery.
I am in the midst of testing some things right now related to all of this and will report back.
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Thanks keep us up to date. I bought this battery too so very interested in any possible solution you find.
Basically the os says its 100% when in reality its not even close, more like 65% right?

Jsimon9633 said:
Thanks keep us up to date. I bought this battery too so very interested in any possible solution you find.
Basically the os says its 100% when in reality its not even close, more like 65% right?
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Yes. 10char.

how does the phone read the charge or does it?
maybe a glitch in regulating the flow?
any software determine could do this?
mine charges a good 8-10 hrs a night
never had a phone that needed more
anyone had to buy a standard battery replacement and get better battery?
software or hardware?

Jsimon9633 said:
Thanks keep us up to date. I bought this battery too so very interested in any possible solution you find.
Basically the os says its 100% when in reality its not even close, more like 65% right?
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Click to collapse
Looks like I failed again. This issue really needs attention from someone well versed with how the Evo charges the battery and how to tweak the reporting deep in the android system. Wiping battery stats in recovery does not solve this issue. We need a SetBat!

I got curious so I looked at the evo's source and found that it stops charging when it thinks the battery is full and doesn't start again until it drops down to 80%. Although it should start charging again if you unplug it and then plug it back in. To fix it you will need someone to make drivers for your battery and incorporate it into a ROM.
Sorry I can't help more but compiling ROMs is still a little bit over my head right now.

xHausx said:
I got curious so I looked at the evo's source and found that it stops charging when it thinks the battery is full and doesn't start again until it drops down to 80%. Although it should start charging again if you unplug it and then plug it back in. To fix it you will need someone to make drivers for your battery and incorporate it into a ROM.
Sorry I can't help more but compiling ROMs is still a little bit over my head right now.
Click to expand...
Click to collapse
Very interesting. The problem here is, the Evo stops charging when it thinks the stock battery is at 100 even though you have an extended battery in it.
I guess we would need a talented dev to compile a fix. Hoping that this thread can bring some attention to that. Looks like we have progress already!

Here are my findings from the monitoring I was doing earlier. It's a lazy Saturday for me so I actually had the time to watch the battery charge. For background info, I am using CM6RC2 and Snap 7.01 with the Seidio 3500 battery.
I let my battery deplete completely last night and woke up to charge it. Knowing full well that the Evo does not charge the battery correctly, I did some research into how I could properly monitor the charge on my own. What we are basically looking to do is to charge the battery to or close to 4.2v. You can monitor this yourself using any battery monitoring program. I was using spare parts.
What I saw was, the battery would charge to what the Evo thought was 100 or close to 100 for the stock 1500 battery, the green light came on and the reporting stats of charge/voltage stopped there. The phone was reporting a constant charge of 100 and the voltage froze at 3.9v despite the fact that the battery was actually charged to around 60-65%. These numbers froze there for a long period of time. The 100/green light never went away and the freeze in voltage reporting lasted about 1+ hours. The freeze at 3.9v was basically the OS reporting the 3.9v in error because it still was thinking that the stock battery was in the phone. The actual battery charge level was neither 100 nor 3.9 volts. Like I said, the voltage stayed at 3.9 for a while, lets say an hour+, and then it started charging up again to 4.2. I saw all of this happen in spare parts. The highest I saw the voltage get was 4207. It took around 5 hours to get to this point. Once it was close enough to 4.2, I rebooted into recovery and wiped my battery stats using Clockwork. On reboot, the battery was actually around 95%. Now I could have plugged the phone back in and repeated they process above but, as this point I basically gave up knowing that I couldn't really go through this type of process ever again because I never have time to sit there and watch a battery charge.
So back to point of this post, we need someone to find a way to have the Evo report true battery stats for extended batteries and not continually have the phone think that it is charging the stock battery. I don't know if it can be done in an app, in a rom, or in a kernel but, however we can get this done, it would be more than amazing.

I have never had a problem with my 3500 Seidio Battery in terms of charging.
I have never had less than 90% charge when I leave for work. But as it has been pointed out multiple times, this phone charges till 100% and then works off the battery until it hits 90%. In essence, this phone will never be charged to 100% unless you do it while turned off or quite possibly with the battery out of the phone.
Next time you think you don't have a full charge, take it off the charger, turn it off and then back on. Then stick it back on the charger, you will see that the charge is down to say.... 93% then it should start charging again. But too be honest, on a 3500mAh Battery, I really don't see the need. If you really need 100%, the best way to achieve this is with the phone turned off.

there are people in evo forums across the net that would donate en masse for this once word spreads. if it needs to be unique to each battery, the four most used are stock, 1750, 3000 chinese (what I have), and 3500 seidio. I would definitely donate for a true fix

Brutal-Force said:
I have never had a problem with my 3500 Seidio Battery in terms of charging.
I have never had less than 90% charge when I leave for work. But as it has been pointed out multiple times, this phone charges till 100% and then works off the battery until it hits 90%. In essence, this phone will never be charged to 100% unless you do it while turned off or quite possibly with the battery out of the phone.
Next time you think you don't have a full charge, take it off the charger, turn it off and then back on. Then stick it back on the charger, you will see that the charge is down to say.... 93% then it should start charging again. But too be honest, on a 3500mAh Battery, I really don't see the need. If you really need 100%, the best way to achieve this is with the phone turned off.
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I assume that you keep your phone charging all night?
If so, this isn't really for people who do that. This is more for people looking to charger their phone to at or near 100 on the go, at work, etc.
Also, 10% on the extended battery is probably a difference of at least an hour more battery. I'd say even more. That's a lot of time to me personally.

cabbieBot said:
there are people in evo forums across the net that would donate en masse for this once word spreads. if it needs to be unique to each battery, the four most used are stock, 1750, 3000 chinese (what I have), and 3500 seidio. I would definitely donate for a true fix
Click to expand...
Click to collapse
Agreed. I'd rather donate money to a true fix than buy an external charger. I have funds to donate for this READY TO GO ASAP.

I think this is a firmware related issue.. I cannot count how many posts and different senarios (batteries, chargers, rom's) I have read, yet still this issue remains. The only things I have ran across that actually works is:
1. Charging the battery externally (wall charger, dock, or etc)
2. Charging phone while phone is turned off.
3. Bump charging (aka: battery conditioning, battery syncing, "plug/unplug method")
4. Clearing the battery stats

Best advice for sharging battery for first use out of box?

so what is the best thing to do?
is there any way of charging,dis charging ect to get the best battery life?
or should i just charg it to 100% and use it right away?
i did a charging squence with my nexus s. but duno about the Gn.

for me is to turn on the device and start working until the battery drops to 0-1%.
only then im charging it X2 then needed to go to 100%, you can make it Double if you want.

Well, this is going to be one of those threads where everyone has their own little way to care for a battery and others say their way is better, etc, etc the arguments breaking out which will result in people posting www.batteryuniversity.com in an effort to win said arguments.
Here's mine. On a brand new phone, I put the battery in, boot up, connect the charger, run it to 100%, disconnect charge, run battery all the way down, connect the charge, run to 100% and go about my life charging when I need to.
My two cents. Have no idea if it does any good, but my SGSII is going on 1 day 14 hrs on a single charge, so it must work somehow...

ericshmerick said:
Well, this is going to be one of those threads where everyone has their own little way to care for a battery and others say their way is better, etc, etc the arguments breaking out which will result in people posting www.batteryuniversity.com in an effort to win said arguments.
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Click to collapse
100% Agree. There will be a lot of different opinions.
ericshmerick said:
Here's mine. On a brand new phone, I put the battery in, boot up, connect the charger, run it to 100%, disconnect charge, run battery all the way down, connect the charge, run to 100% and go about my life charging when I need to.
My two cents. Have no idea if it does any good, but my SGSII is going on 1 day 14 hrs on a single charge, so it must work somehow...
Click to expand...
Click to collapse
My way,
Turn on phone, charge it to 100%, leave it plugged for an extra 20 min, and start using it normally.
The only time I discharge a battery is after a couple of months. Because we never charge it to 100% and they start creating memory and charging less and less every time. The purpose of discharging it completely is to erase its memory. That's why when it is new, I see no point on discharging it completely. Batteries suffer every time they are completely discharged and if they are left 100% for a long period of time, thats why new batteries always come charged about 50%, to extend battery life since they may be stored for a long period of time. (ref. aviation school)
Just my 2 cents.

sstang2006 said:
The only time I discharge a battery is after a couple of months. Because we never charge it to 100% and they start creating memory and charging less and less every time. The purpose of discharging it completely is to erase its memory. That's why when it is new, I see no point on discharging it completely. (ref. aviation school)
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That hasn't been true since NiCd's in the 1980s.
Modern Lithium-Ion and Lithium-Polymer batteries have no "memory" and are actively damaged if allowed to discharge fully.

HooloovooUK said:
That hasn't been true since NiCd's in the 1980s.
Modern Lithium-Ion and Lithium-Polymer batteries have no "memory" and are actively damaged if allowed to discharge fully.
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OK, I may be wrong I'm no expert.
Why do people keep discharging them to 0% if they have no memory? (I'm not been sarcastic)

sstang2006 said:
Why do people keep discharging them to 0% if they have no memory? (I'm not been sarcastic)
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Generally because they don't know any better and they don't realise battery technology has moved on.

Because batteries "back in the days" were quite sensitive to memory. That's why we were all raised by the complete-discharge-mantra, which sticks with you forever. The next generation won't have this problem and will feel free to charge their phones when they want to. ;-)

sstang2006 said:
OK, I may be wrong I'm no expert.
Why do people keep discharging them to 0% if they have no memory? (I'm not been sarcastic)
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Becouse android in itself keeps a battery log, it is from this log your device calculates the amount of battery you have left. To keep these values true (calibrated) you should do 2-3 cycles where you on purchase, discharge fully until device auto shut down, start it WITHOUT charge a couple of times and let it die to set the min value, charge up to 100%, use your device again till auto shut down... you dont have to worry about damaging your battery in this case since your device it programmed to shut down with good marginal of battery depletion. What you SHOULD NOT do is leave an empty battery uncharged for a long period of time.
Sent from my X10i using xda premium

Lithium batteries will be damaged if they are stored fully charged or fully discharged for extended periods of time. Thats why the battery is about half charged when its new. They have no memory effect, they just loose capacity.
Sent from my Nexus S using Tapatalk

Tjotte said:
Becouse android in itself keeps a battery log, it is from this log your device calculates the amount of battery you have left. To keep these values true (calibrated) you should do 2-3 cycles where you on purchase, discharge fully until device auto shut down, start it WITHOUT charge a couple of times and let it die to set the min value, charge up to 100%, use your device again till auto shut down... you dont have to worry about damaging your battery in this case since your device it programmed to shut down with good marginal of battery depletion. What you SHOULD NOT do is leave an empty battery uncharged for a long period of time.
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Good point. While it's important not to fully discharge the battery too often, there is also the issue of calibrating the battery meter.

ericshmerick said:
Well, this is going to be one of those threads where everyone has their own little way to care for a battery and others say their way is better, etc, etc the arguments breaking out which will result in people posting www.batteryuniversity.com in an effort to win said arguments.
Here's mine. On a brand new phone, I put the battery in, boot up, connect the charger, run it to 100%, disconnect charge, run battery all the way down, connect the charge, run to 100% and go about my life charging when I need to.
My two cents. Have no idea if it does any good, but my SGSII is going on 1 day 14 hrs on a single charge, so it must work somehow...
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That's exactly what I do, had 14 hours of moderate use today and still had 45% left. More than happy with that. It seems to be getting better each day at the moment.

Crin said:
That's exactly what I do, had 14 hours of moderate use today and still had 45% left. More than happy with that. It seems to be getting better each day at the moment.
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78% after 14 hours here, but that's light use.

sstang2006 said:
OK, I may be wrong I'm no expert.
Why do people keep discharging them to 0% if they have no memory? (I'm not been sarcastic)
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The whole "discharging the battery fully" thing doesn't really apply here - because nobody will ever fully discharge it. The Nexus uses a Lithium Ion cell - it's a single cell, with a nominal voltage of 3.6V. When fully charged, it peaks at 4.2V (at which point, the charging circuitry cuts off to avoid overcharging). However, when we "fully discharge" our phones, the cell only goes as low as 3.5V - and then the phone shuts off.
In reality, lithium cells can discharge to around 3.0V before any damage occurs. However, this would yield very little extra battery life. Stopping at 3.5V provides a wide safety margin (lithium cells are potentially dangerous if overcharged/discharged), whilst extending cell life.
In a nutshell - don't worry about running your phone down to 0% (unless you're putting it in storage, in which case leave it at about 60%). In fact, it's a good thing with a new phone, as cycling (charging and discharging a cell) helps to "wake" the cell up and reach it's max capacity more quickly.
Sent from my Galaxy Nexus using XDA App

i see some good ideas about charging and discharging.
but it is indeed a fact that 100% and 0%(real) isnt good for our new race of battery's.
but a few posts here already tell how and what.
and its not gonna be a thread of arguments and stuff,if we all keep it in our heads that we just want to share our tip's of how you think its the best way(and have some experience with it)
just to share some info. and not compete the info against each other.
i well know there are different ways. but its always nice to read what experience people have with it to make a choice for my own and any other wanting to know this.
and i posted here in the GN section,instead of the Android section because each phone handles battery different,and this narrows the options down to a single device :3

Just keep in mind it's not just about the battery itself it's about the software registering how much actual power the battery has at a certain time, so if the battery has in actuality 100% charge in it, and the software reads 80 then your phone will die out sooner. So charging and discharging is good because it calibrates the hardware with the software. Just remember to switch off the device then charge it so the software doesn't auto discharge when it thinks the battery reached 100%.

K i just skipped thru the posts, gonna throw in my input real quick.
Basically just run down the battery. Once it turns off, hold the power button to make sure all the juice is gone. Then charge it up to 100% and leave it there for a good hour. Now (root required) download https://market.android.com/details?...yLDEsImNvbS5uZW1hLmJhdHRlcnljYWxpYnJhdGlvbiJd and follow the instructions .. its not exactly necessary but a nice thing "just in case" .
thats my plan anyways.

Nutsonfire said:
Lithium batteries will be damaged if they are stored fully charged or fully discharged for extended periods of time. Thats why the battery is about half charged when its new. They have no memory effect, they just loose capacity.
Sent from my Nexus S using Tapatalk
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Where does the loosed capacity go? Can it be caught?

And what do you think about charging with the phone being switched on? Is it better to have it switched off?
Sent from my Galaxy Nexus using xda premium

juniorbattle said:
And what do you think about charging with the phone being switched on? Is it better to have it switched off?
Sent from my Galaxy Nexus using xda premium
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Won't make a difference.. Phones are designed to be left on anyway.

[Q] Sudden battery drop HTC One M8

Last weeks my phone time after time suddenly shuts off due to no battery left.
without even giving the usual warning popups.
Check the photo to see what happens.
Already did battery test, no unusual results.
also the factory reset didnt help.
How to solve this?

JWD1993 said:
Last weeks my phone time after time suddenly shuts off due to no battery left.
without even giving the usual warning popups.
Check the photo to see what happens.
Already did battery test, no unusual results.
also the factory reset didnt help.
How to solve this?
Click to expand...
Click to collapse
It could be due to calibration issue. Try using your phone's battery all the way to 0% and it'll shut down automatically and turn it off to charge all the way to full and use it. If the problem still persists, there could be some issues with the battery but if the issues doesn't exist anymore, it could be calibration issue.

more info
Check the photo's

I've seen this happen (either to me, or reports by others) on just about every recent Android device I've owned (4 different devices), not just HTC, but Samsung as well. The battery seems to tank instantaneously, losing 30 or 40% of its charge or more, and the device shuts down. Doesn't usually happen often, just rarely. And some folks will probably never see it happen.
As mentioned above, I can only assume its a metering glitch. Just recharge the device (recalibrate the meter, if you like), and move on.

JWD1993 said:
Check the photo's
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redpoint73 said:
I've seen this happen (either to me, or reports by others) on just about every recent Android device I've owned (4 different devices), not just HTC, but Samsung as well. The battery seems to tank instantaneously, losing 30 or 40% of its charge or more, and the device shuts down. Doesn't usually happen often, just rarely. And some folks will probably never see it happen.
As mentioned above, I can only assume its a metering glitch. Just recharge the device (recalibrate the meter, if you like), and move on.
Click to expand...
Click to collapse
found this somewhere a while ago ..it's worth a shot
Have you tried a hardware battery recalibration?
The battery calibration starts with the phone completely off. The steps are as follows: Charge the device for at least 10 minutes using the original charging cable in a wall outlet. With the device powered off while still plugged into the wall outlet, press and hold the volume up, volume down and power button for two full minutes. Use three fingers to hold these buttons and do not let go at any time. They will be held in at the same time for this to work. After two minutes, you can let go. At this point, the device should boot up and battery/charging logic will be re-calibrated.
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I have also charged the phone to 100% reboot to TWRP charge to 100% then shut down and charge to 100%
all three locations monitor the battery differently. In fact TWRP sometimes showed 93% when the OS said it was full.

I've never heard of button combos affecting the battery calibration, and it sounds like a placebo to me. I also think the trick of charging the phone while off was disproved as baloney, a long time ago.
All the meter needs to do is set "high" and "low" flags to corresponding voltages. I seriously doubt any button pushing will affect this. Let the phone charge to 100%, let it stay on the charge for a while to ensure any saturation charge. Then drain to close to empty. I don't personally advise to drain to shutdown. I understand its not zero voltage or anywhere close (more like 3V). But its also not good for the battery.

redpoint73 said:
I've never heard of button combos affecting the battery calibration, and it sounds like a placebo to me. I also think the trick of charging the phone while off was disproved as baloney, a long time ago.
All the meter needs to do is set "high" and "low" flags to corresponding voltages. I seriously doubt any button pushing will affect this. Let the phone charge to 100%, let it stay on the charge for a while to ensure any saturation charge. Then drain to close to empty. I don't personally advise to drain to shutdown. I understand its not zero voltage or anywhere close (more like 3V). But its also not good for the battery.
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Well the information come from the Android Forums ...it has worked for others
This is directly from HTC tech support. To recalibrate battery and HTC charger when battery rapidly or erratically discharges, this procedure clears all battery stats, coordinates and normalizes charging.
Turn off Fast Boot in settings. Power off phone.
Plug phone into HTC charger and charge for two minutes or more
While charging, hold down volume up+volume down+power button and continue holding
Phone will turn on and off repeatedly every 15 seconds or so while continuing to hold all three buttons
Keep this going for 2 minutes, then release buttons when phone is ON
Now, let phone charge fully normally (with phone either on or off--doesn't matter) and battery level reporting, charging and battery life should be normalized.
Do this every month or so to keep power system healthy--even if everything seems fine. Also, don't leave phone on charger overnight for best long term battery life (according to HTC tech support: "The first thing they tell us." This is true even though charging is supposed to turn off when battery is at 100%)
NOTE: Another potential fix for battery/charging abnormalities if this procedure fails (esp. after an OTA update when corrupted files can remain stuck in device cache partition)--clear cache partition using this method:
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clsA said:
Well the information come from the Android Forums ...it has worked for others
Click to expand...
Click to collapse
Citing the source and providing details makes it sound a little less hokey. Still, probably impossible to say whether it really "works", or just a placebo.
Not sure what "coordinates and normalizes charging" if anything. But battery stats was debunked some time ago as something even worth wiping (since its wiped every time you charge): http://www.xda-developers.com/android/google-engineer-debunks-myth-wiping-battery-stats-does-not-improve-battery-life/

redpoint73 said:
Citing the source and providing details makes it sound a little less hokey. Still, probably impossible to say whether it really "works", or just a placebo.
Not sure what "coordinates and normalizes charging" if anything. But battery stats was debunked some time ago as something even worth wiping (since its wiped every time you charge): http://www.xda-developers.com/android/google-engineer-debunks-myth-wiping-battery-stats-does-not-improve-battery-life/
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yeah maybe the OP @JWD1993 can test it and let us know

clsA said:
yeah maybe the OP @JWD1993 can test it and let us know
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Click to collapse
Agreed. And thanks for the additional info, in any case.

...
redpoint73 said:
Agreed. And thanks for the additional info, in any case.
Click to expand...
Click to collapse
Tested it a few times last days.
when the battery dropped from around 40% to 0% (and device went off).
i charged it for about 10 minutes.
then dit the trick with the three buttons.
i was surprised to see that after rebooting the battery level was 35%.
Before i did the trick the phone showed 5%
But sad enough the device went off after 15 minutes..
and the percentage was 0 again.
This doesn't happen rarely.. it happens every day

JWD1993 said:
Tested it a few times last days.
when the battery dropped from around 40% to 0% (and device went off).
i charged it for about 10 minutes.
then dit the trick with the three buttons.
i was surprised to see that after rebooting the battery level was 35%.
Before i did the trick the phone showed 5%
But sad enough the device went off after 15 minutes..
and the percentage was 0 again.
This doesn't happen rarely.. it happens every day
Click to expand...
Click to collapse
that's pretty crazy and at 10:10 at night ... do you work late or what happens at 10:10 PM

clsA said:
that's pretty crazy and at 10:10 at night ... do you work late or what happens at 10:10 PM
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Nope, most of the time im just checking social media.. or chatting at whatsapp

JWD1993 said:
Different timezone I think. It's 23.54 over here..
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I was referring to the time the battery dropped in the last graphic

clsA said:
I was referring to the time the battery dropped in the last graphic
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Yeah sorry, misunderstood.
Edited my post
And as you could see i barely used my device today..
so it should last a way longer than this after a half year of use