Develop Bugs

Correct way to recalibrate/wipe battery stats

Does anyone have a link for the thread that discussed the correct way to wipe battery stats when upgrading to a new Rom? I remember it went something like drain dead, charge to full, drain dead again then charge to full and wipe stats. I can't remember the complete process. Thanks for the help.
Sent from my PC36100 using XDA App

I've seen a couple different threads on that here, one saying discharge fully then charge while powered off, and the other saying to do a full charge "conditioning cycle". I did the latter and it seems to have made a difference.
Here's what I did:
Charge the phone fully with it powered on
When fully charged, disconnect cable
After green LED goes off, power the phone off
When phone is fully powered off, reconnect cable, amber charging light should be on
When LED goes green, disconnect cable
Repeat previous two steps 10 times
After 10th cycle, boot into recovery and wipe battery stats.
I am using Amon Ra recovery which has the wipe battery stats option under the Wipe option. I never did this when I had Clockwork recovery installed, so I don't know if the option is in the same place.
Being an electrical engineer, I find this business of battery conditioning interesting, along with the Ni-Cd "memory" vs. Li-Ion "no memory" issue. If anyone has found a decent physics-based explanation as to why these things do or do not have any basis in fact, I'd appreciate a link. Yes, I'm too lazy to Google it at the moment.

Hmm, I may have to look into this again. I charged my phone all night (powered off) and unplugged it this morning. I did nothing with it this morning but turn it on and look at it, then put it in standby (quick press of power button). It lost 16% of charge in less than 2 hours!
I'm running BS1.2 with the Baked1 (low voltage/best battery) kernel.
Damn, just installed System Panel and found that my CPU is at 100% constantly!

I'm trying this now. The longest I've pushed my battery was 22 hours... and that was with 39 minutes of screen on time, lol. In standby almost the entire 22 hours....

Ok, I believe my issue was related to a camcorder problem, my CPU usage has dropped back to normal levels after fixing that separate problem. After my battery recharges fully I will see what happens with the charge.

the other methods to do "calibrate your battery" (which isnt really calibrating the battery but the battery stats of the phone so it can accuratly judge when it stops and starts charging)
1) charge the phone to full
2) unplug and use phone till it shuts off from no battery (do not plug in until it shuts off)
3) charge phone to full again with out unplugging till 100% (check under about phone > battery it shoudl say full charge there)
this should reset the battery stats.
the last method is one from HTC
1)Charge the phone for 8 hours uninterupted with power on
2) turn off the phone and charge for an additional hour
3) turn ont he phone unplug it and let it sit for 2 minutes then plug it in for an additional hour.
all 3 methods listed should help. I personally dont like the x10 method because it has the potential and basically over charges the battery to make sure it is acctually at a full charge. It is much faster then the other 2 methods though so to each there own.

Dont waste your time on...
plug/unplug 10 times. It really doesn't recal the battery.
the unplug/plug 10 times.
1. Phone on...charge until green light comes on. Immediately unplug and turn phone off.
2. Plug phone back in until green light comes on again. Immediately boot into Recovery and wipe battery stats.
3. Use the phone on battery until dies.
4. recharge phone to 100%
You are good to go!

If I tether during the day (5+ hours) a lot, is it bad on my battery? Isn't that like a constant charge or does once the LED turn green it stops trying to charge?
Thanks.

fldash said:
If I tether during the day (5+ hours) a lot, is it bad on my battery? Isn't that like a constant charge or does once the LED turn green it stops trying to charge?
Thanks.
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the evo doesnt do a trickle charge so when the light turns green it stops, this is why you will almost always drop 1-5% battery rather quickly.

Are you sure? My light has been green for a while, and my phone battery status says 'Full'.

fldash said:
Are you sure? My light has been green for a while, and my phone battery status says 'Full'.
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Click to collapse
There's a lot of confusion over how the battery / charging circuit works and how it reports. My advice is to just charge until it's green and full, then unplug it. If you leave it plugged in all night, unplug it for 10 mins in the morning, then plug it back in to top off.

That doesn't really help me SilverZero, my question is only if leaving it tethered (which means connected to USB) is bad for my battery.

Well on mine i would check it every once in awhile and i would see that once it get downs to under 90% that it would charge again till it recognized that it was full again. So based on that i dont think you should have to worry about it. It seems to only draw the charge when needed. I also leave mine plugged in alot when im home so its good to go when i leave and havent noticed a loss of battery life at all.

You guys don't want the charger to trickle charge. Li-Ion does not accept overcharge, even 0.01C (15 mA on the stock Evo battery) will cause it to vent and probably combust.

So does "calibrating the battery" calibrate the phone or the actual battery?
I ask because I have 3 spare batteries, wondering if I have to do this for each of them??? They are all standard size, one of them OEM

[Q] What the latest on battery fix?

I have browsed the threads on the issue with the bump charge, but not a lot of people complaining about it so it made me think there was a fix. I cannot find the fix if it exists. The only issue I see people complain about is the length of time it takes to charge, but I'd rather just get a FULL charge with the phone on instead of having to charge it while its off....

I haven't heard much about it in a while, either, but did notice this with 2.2: Bump charging still works (as in, the LED turns red again when I turn off my phone and charge it) but the charge doesn't last as long as it did on 2.1...UNTIL I plug in my phone again. Then it takes a while to charge back up to 100, but then stays charged. It seems like bump charging now tells the phone that it can hold more charge, but it doesn't happen until you charge up the phone again while it's on.

I get a lot better life just charging the phone while it is off, at night.
Sent from my ADR6300 using XDA App

People at androidforums reported much better charging on the ruby 1.1.1 rom.

forum.xda-developers.com/showthread.php?t=714471&highlight=battery
thread title is Battery Recalibration
im trying those instructions. I hope that deleting the battery stats will force the phone to "bump" charge while still turned on rather than turning it off to get the extra juice

I've tried the battery recalibrate thing, didn't seem to do much for me...

...
Bump charge still works.
The kernel lets the battery charge only so far, and if you really really really think about the bump charge solution, it is simply "charging with the power off". Then the kernel is not so much in charge.
Ironically, if you charge with the power off, and then you turn it on but leave it plugged in, you will start expending the battery even though you never unplug it. It will ultimately settle at the level that a powered-on-not-bumped battery would settle at fully charge.

[Q] Instant discharge.

So, I'm on my Evo today, playing a game (Air Strike). My battery is at 93% when I picked the phone up to play, and the phone is plugged in. Suddenly, with no warning what-so-ever, my phone shuts off. Of course a mini-freak out and many "wtf's" ensue. No warning, no signs, even the led went off. I pulled the battery, put it back, then plugged the phone in again. After that it gave me the blinking light indicating the battery was too low to turn on. After a few minutes charging she came back on and battery was at 5%.
How the hell does a battery go from 93% to 0% in less than 5 minutes, and give no warning at all?? Anybody else ever have this problem?

Wow I've have never heard or that happening before. Maybe a glitch in the battery stash? Did it take awhile to charge up to 100%? Can you reproduce the issue again?
Sent from my EVO (CM 6.1.1) using XDA App

I had this problem with my older phone once. The battery itself may have a problem or your phone is not getting charged properly.
Try These :
1) Try charging the phone overnite from the Wall charger (Not through USB of your computer)
2) If the above does not work, and you have access to another evo battery, then try using that.(try using a friends battery and charger for a day. ) (Ofcourse needless to say the charger and battery must be for Evoonly )
In my case, my phone started working fine again after getting my battery & charger replaced.

Probably shouldn't worry about it too much just yet. Could be something as simple as your battery meter was mis-calibrated. The meter itself is software so it can easily be wrong/off. If it continues you may have a bad battery.

Sounds to me like something is wrong. Did you just get the phone or have you had it?

Idk... The phone had been plugged in for most of the day (hadn't gone anywhere. Lazy day lol) And like I said, the led went completely out as well.
Haven't had the problem again, so we'll see I guess....

Mark_Hardware said:
Idk... The phone had been plugged in for most of the day (hadn't gone anywhere. Lazy day lol) And like I said, the led went completely out as well.
Haven't had the problem again, so we'll see I guess....
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Click to collapse
I've seen some posts about the Evo battery shutting off the charge when its being used. Were you using your Evo while it was charging?
If the battery doesn't seem to be giving you percentages that are accurate, you might want to recalibrate your battery.
Common misconceptions sticky (Evo Q&A) said:
Battery recalibration (Thanks to Cyanogen for this and to fachadick for bringing it to my attention).
If you're experiencing higher than normal battery drain, try the following:
1. Charge the phone to full battery; let it keep charging until the battery says it is fully charged. Do not just wait until the light is green, it isn't always fully charged, causing a lot of inaccuracies. (You can check by going to: Settings -> About Phone -> Status -> Battery Level = Full.)
2. Boot to recovery and wipe battery stats.
(To have the most accurate of battery stats, reboot the phone immediately after wiping the battery stats and wait for your ROM to boot completely to the desktop. Once your entire boot is done and you have full access to the phone, go ahead and pull the charger and continue.)
3. Do not charge the phone until after draining the battery completely, resulting in it automatically shutting off. Take out the battery, and keep trying to turn on your phone until it will not turn back on at all.
4. Recharge the phone completely and then use as you normally would.
This is a method that has been proven to work, I am sure there are other ways. My battery lasts longer after doing this and the reading is much more accurate. It might be advisable to do this after every ROM install if you want the most battery life and most accurate battery reading by the phone's software.
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Click to collapse

Battery calibration - never finish charging in recovery?

Hey there,
I tried to calibrate my battery the last few days...
There where so different descriptions on how to do it right.
But well at some point they all said to charge the phone turned of ( well it automaticaly jumps into recovery, right?).
And it was said charge it till the led goes green.
But I think it never happens in my case.
In one case I fully chagred my phone powered on and then turned it off, plugged it in again. The red/orange led staied there even after 3 hours...
The other day I fully discharged the phone and wanted to charge it in recovery mode. So I plugged it in, the red/orange led began to flash, recovery booted and I went to bed. About 10 hours late I woke and the led was still flashing as before.
I had no patience and turned it on. With the system running it tells me, that its at 100%.
Turning it off again unplug and replug it will show the red/orange led again but not flashing.
Its a european desire z (germany)
On Virtuous 0.9
With clockwork 2.something
Any ideas? Should I have been even more patient to see the green light in recovery? How long could it take?
Thanks,
- coni
Sent from my HTC Vision using XDA App

It seems the question of how to charge the battery pops up at least once a week now, with the same misconceptions. There is no such thing as calibrating the battery. All you are doing is calibrating the battery meter (just a volt meter) on the phone. Li ion batteries cannot (and should not) be calibrated or conditioned. The best way to calibrate the meter is to charge the phone to 100%, drain to about 20%, repeat a couple times. You should not discharge the battery below 20%. I cover it a little more in depth on the following post:
http://forum.xda-developers.com/showpost.php?p=11026655&postcount=7
I don't see any advantage to charging the phone while its off (except that it will charge faster, of course). I always charge mine while its on (with screen off).
I don't know why your green light is not coming on. Mine comes on after the phone has been charging for about 2 hours or less. But I am on the stock ROM, so its possibly something to do with the ROM, so you might have some better response by searching or asking in the Virtuous thread.

Yeah I know that you just calibrate the voltage meter but its just easier to say battery calibration.
Well maye the misconceptions occur because there are plenty of different answers spread and its easy to become confused. I just avereged over these methods and the consensus was to change fully while turned off.
The only way I could think of loading in recovery is better, is that the software prevents loading when it thinks battery is full (but in fact it is not), but I relly dont know.
And you say even after deleting battery stats there is no need for discharging till shutdown (to show the limits or anything)? To reset on full battery is enought?
Thanks,
- coni
Sent from my HTC Vision using XDA App

does anybody know how to delete battery statistics of the Desire Z ?
I want to calibrate battery and delete old stats.
Thanks & Greets

Well, your problem first if that you said you had recovery 2.x and that if you turned it off it automatically jumps to recovery.. you seem to have the first recovery that the power off feature wasnt quite working well.. upgrade to a 3.x then like the above user said but drain the battery until it reaches %15.. thats when the Connect To A Charger popup shows up.. and charge to 100% and do couple cycles of these..
Sent from my T-Mobile G2 using XDA Premium App

Phone shuts down at 14%

So, I bought another battery. Will this sort it?
Also, what's the usual procedure?
Should I charge the battery to full in the phone (turned off) then boot, set up, then charge again and reset battery stats?

The problem is that the battery control chip doesn't take into account that the battery ages.
Resetting battery stats or charging while turned off will only clear the stats you see in the settings menu. This guide will make your battery drain to 0% again: http://forum.xda-developers.com/showthread.php?t=1534892
I don't know what a new battery will do though.

I gathered that, but as the phone is going to a new user (my stepson) we got him a new battery anyway
I just wondered what the correct procedure is. I know you need to do a first charge with a new battery, as with a new phone, however, this phone obviously has a working ROM already on it.
So, the phone is charging now, switched off. Should I turn it on, use a little, then use the battery calibration app to delete the stats and then drain to 0%?

Kryten2k35 said:
I know you need to do a first charge with a new battery, as with a new phone
Click to expand...
Click to collapse
Well, that assumption is probably inherited from the NiHM batteries in the past, because it's not needed with Li-Ion batteries. In fact charging to 80% is better than charging to 100% and keeping it plugged in.
You can read more about it here and here.
Kryten2k35 said:
So, the phone is charging now, switched off. Should I turn it on, use a little, then use the battery calibration app to delete the stats and then drain to 0%?
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Click to collapse
Just charge it and use it for a full cycle. If it shuts down at 15%, you can try the battery calibration from the thread I mentioned above. If it doesn't, you're battery capacity is the same as the one the battery chip has calculated, which is good.

So, why does the first charge take so long?
This thing is still charging and it's been on the charger for 3 hours, whereas usually it'd be charged fully by now.
Been like that for every Li-Ion battery I've ever had (including my S3, took around 6 hours to charge, usually takes 3).
EDIT:
Just to clarify, I don't intend on leaving it past the green light. As soon as it says it's full I'll be taking it off charge and not trying ot overcharge it. But I still have the orange charging light after 3-4 hours.

To be honest, I don't know. Maybe it's a safety to prevent overcharging. Coincidentally, I've got exactly the same issue now. I asked about it in the calibration thread. I suppose it's normal, but I'm not sure about that.

Kryten2k35 said:
So, why does the first charge take so long?
This thing is still charging and it's been on the charger for 3 hours, whereas usually it'd be charged fully by now.
Been like that for every Li-Ion battery I've ever had (including my S3, took around 6 hours to charge, usually takes 3).
EDIT:
Just to clarify, I don't intend on leaving it past the green light. As soon as it says it's full I'll be taking it off charge and not trying ot overcharge it. But I still have the orange charging light after 3-4 hours.
Click to expand...
Click to collapse
my battery took just over 6 hours to charge the other day from completly dead
Sent from my HTC Desire