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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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] real guide to calibrate battery

Hello to all people.
I read all guides in this forum about battery calibration but nothing same to be correct for me!
I have leeDroid 2.2e ROM Oc up 1156mhz and smarttass governator.
The problem is that my battery drain too fast!after a complete night charge I turn on my phone and after 5minutes my battery goes down to 99 98 97 until 89 in an hour!the very strange problem is that I can see 100% only for very few minutes.
I have downloaded from market battery booster and I have noticed that if my voltage is 4192mv under charge with green led, when I unplug the phone from charge the battery drains less quickly.also i have noticed that after a night of charge my led is green and when I turn on it after one minute if I plug to ac my led remains orange for a lot of time!!!!that is very strange!!!
Can anyone help me?
sent from the future

I saw another post in a German forum to this topic and I made it like this, 'cause my Battery went directly to 89% after plugging off the cable: Load your battery with the phone turned on until the green LED light is on. Then plug it off, turn the phone off, plug it in and let the battery load until the LED is green again. Then plug it off, turn the phone on and let it boot completely. After that, turn it off again, plug the cable in and let the battery load until the LED is green. Then plug the cable off, turn your phone on and use it. The problem shouldn't be there anymore. But you should do this everytime you flash a new Rom!

Ok thanks man!but I don't see in any steep how to restore the battery stats via recovery
sent from the future

I believe the reason for the battery going straight to 89% is because when the battery is at 100% and its still on charge, every now and then, the phone discharges itself down to 90% and then back up to 100%. This is because trickle charging is generally considered bad. If you dont believe me, download Juice Plotter from the market. charge your phone up to 100% and leave it on charge overnight. When you check juice plotter in the morning you will see that every so often it drops to 90% and back up to 100%. Chances are that somepeople are taking thier phone off charge when the phone is in the middle of one of these dips. I know i do it all the time.

mattiadj said:
Ok thanks man!but I don't see in any steep how to restore the battery stats via recovery
sent from the future
Click to expand...
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You don't restore battery stats from recovery. You wipe battery stats!

alex101uk said:
every now and then, the phone discharges itself down to 90% and then back up to 100%.
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Thanks for that info, I had been wondering about that myself.

StuMcBill said:
You don't restore battery stats from recovery. You wipe battery stats!
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Yes it is what i want mean, sorry for mistake...so i don't need to wipe battery stats?

You don't have to but you can. In AmonRA go to "Wipe" and choose "Wipe Battery Stats". In Clockwork it is in Advanced, I think...Or in the Section where you can mount the drives...The Tip that I wrote is the Battery Calibration how you can find it on HTC's Homepage. If your Desire is rooted, you can just wipe the stats if you want to.

Moved to Q&A as not development.

[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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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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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

[Q] Phone Charging Question

Problem:
I have been reading as many posts as possible but I haven't come across my exact situation. I apologize if this is posted elsewhere.
I am running a rooted Dinc using CyanogenMod 7.0.3. If I charge the phone while it's powered on, the amber led turns green as soon as the battery indicator hits 100%. However, recently I've noticed that if the battery is close to being full, say 90%, and i power it off to charge it, it actually takes longer for the amber led to turn green. It might take 20-30 minutes longer.
I've also noticed the amber light turn green when the indicator only showed 92%. In trying something different I also noticed that if I charge the phone while it's powered on, then turn the phone off, the led goes amber and takes another 20 minutes to turn green again (I might be accidentally bump charging in this example but I'm not sure).
Attempted Solution:
I've read that a battery recalibration might help. I tried one method that requires the battery to be pulled after a full charge, but my phone won't boot while plugged into the wall if there's no battery. Then I tried booting into recovery, where I found an option to reset the battery stats... which I just did about 5 minutes ago.
I'm going to see how things go tomorrow, but is this normal? Has anyone else experienced these things? Thanks.

Logan176 said:
Problem:
I have been reading as many posts as possible but I haven't come across my exact situation. I apologize if this is posted elsewhere.
I am running a rooted Dinc using CyanogenMod 7.0.3. If I charge the phone while it's powered on, the amber led turns green as soon as the battery indicator hits 100%. However, recently I've noticed that if the battery is close to being full, say 90%, and i power it off to charge it, it actually takes longer for the amber led to turn green. It might take 20-30 minutes longer.
I've also noticed the amber light turn green when the indicator only showed 92%. In trying something different I also noticed that if I charge the phone while it's powered on, then turn the phone off, the led goes amber and takes another 20 minutes to turn green again (I might be accidentally bump charging in this example but I'm not sure).
Attempted Solution:
I've read that a battery recalibration might help. I tried one method that requires the battery to be pulled after a full charge, but my phone won't boot while plugged into the wall if there's no battery. Then I tried booting into recovery, where I found an option to reset the battery stats... which I just did about 5 minutes ago.
I'm going to see how things go tomorrow, but is this normal? Has anyone else experienced these things? Thanks.
Click to expand...
Click to collapse
The kernel and the hardware charge it in different ways. That's why there are differences. DInc is famous for ending charging before the battery reads full. There's already a thread on that. there's not much point in getting hung up on how that thing charges. Be glad yours isn't like mine; a battery that discharges faster than it charges. Seriously.

loonatik78 said:
The kernel and the hardware charge it in different ways. That's why there are differences. DInc is famous for ending charging before the battery reads full. There's already a thread on that. there's not much point in getting hung up on how that thing charges. Be glad yours isn't like mine; a battery that discharges faster than it charges. Seriously.
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Before I had a fast charge kernel (thanks Chad!) Using GPS with the stock VZW car charger, my battery would go down while it was on the charger!
Sent from my ADR6300 using XDA App

On AOSP roms, the LED will turn green at 90% and charge slower from 90%-100%. Perfectly normal, and I think on any rom it will charge slowly from 90%-100% to protect the battery.
The battery will charge further when you turn the phone off, what you described is what's known as bump charging. If you do this, you should notice a slower drop from 100%-90% than usual, because the battery is charged to a "true" 100%. When the phone is on and charging (above 90%), it simply keeps the battery above 90% even if it says it's fully charged, and this is why the inc is notorious for the quick 100%-90% drop.

If you do a bump charge and then clear the battery stats and use the battery calibration app will you need to bump charge again or will it know what the true 100% capacity is and keep the droid lasting longer. Not noticing much of a diffrence when i went from 1300 battery to a 1500. May get a bigger batter that'll fit the stock battery door cause I'm trying to get the best battery life i can get.

Thanks guys, I appreciate the help. I think something else that has thrown me off is that before I rooted the phone I wasn't able to see the actual battery percentage in numbers... all I could see was the battery icon. Things are now making more sense.
After recalibrating my battery I bump charged the other day and I was able to get almost 2 days out of my phone on light usage. Without bumping, I was able to end my day yesterday at 50% under my normal usage. Which is a noticeable improvement. Normally I end the day with about 10-20%. The big test will be once I go back to work next week. The cell reception is real spotty in my classroom, which I know makes the cell radio work harder.
Thanks again.

I found a lot of answers I was having about battery charging in this thread:
Your battery gauge is lying to you (and it's not such a bad thing)