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
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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] Charing problem

So I recently flash CM7 RC1, and I tried to charge my battery for the first time with the ROM, it doesn't charge.... I plugged in my USB to PC and started transferring and pushed some files in. Then I noticed that it my phone wasn't charging, and then I tried using the AC charger and it shows its charging for like a couple of minutes then states your battery is low and stuff. I then go into settings and checked out the status of my battery. It shows "Discharging" any ideas what this means and why its not charging?

Chinam4n said:
So I recently flash CM7 RC1, and I tried to charge my battery for the first time with the ROM, it doesn't charge.... I plugged in my USB to PC and started transferring and pushed some files in. Then I noticed that it my phone wasn't charging, and then I tried using the AC charger and it shows its charging for like a couple of minutes then states your battery is low and stuff. I then go into settings and checked out the status of my battery. It shows "Discharging" any ideas what this means and why its not charging?
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Does it charge when the phone is off? If it does go into CWM and wipe battery stats under advanced and see if it fixes it for you
Sent from my HTC Vision with Habanero FAST 1.1.0

I tried that, left it for the whole night, nothing. I can't even power up the phone with the battery. I believe I have a dead battery . I guess those 3500mAH batteries on ebay is cheap for a reason....

[Q] Please help! Phone shutdown at 12% battery remaining

I have tried to calibrate and wipe batt stats.
What can i possibly do?
Should a calibration have fixed this or not?

Charge phone 100%....then complete wipe; dalvik, battery, etc....reflash ROM...then another battery wipe and a reboot...should do the trick
Sent from my HTC Vision using XDA Premium App

Also when you charge the phone to 100% turn it off and charge again until light goes green.

Edwg318 said:
Charge phone 100%....then complete wipe; dalvik, battery, etc....reflash ROM...then another battery wipe and a reboot...should do the trick
Sent from my HTC Vision using XDA Premium App
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Has anyone else tried what this user says?
Also when you charge the phone to 100% turn it off and charge again until light goes green.
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It does not matter. When i turn it off and put in the charger it goes to green straight away!

Once you have taken it to 100% take it off the charger use it for 5 mins turn it off then put back on charge while phone is off. Or just check out the link yourself

turnerpctech said:
Once you have taken it to 100% take it off the charger use it for 5 mins turn it off then put back on charge while phone is off. Or just check out the link yourself
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It does not mentioning using it for 5 mins?
Also i already mentioned that I HAD calibrated the battery.
Does anyone know how one can test and see if the battery has been calibrated succesfullt?

Using AOSP Gingerbread ROM? Many users reported their phone shutting down at 10+%.
I'm still on froyo an phone shuts down at 1-2%.

Yes exactly! Using Oxygen 2.0.3
Actually I haven't found posts about other users with shutoff probs around 10%!
---- edit
But actually i also had the problem before rooting and changing rom on stock desire 2.2.
But there it turned off at around 7-8%

I actually came across a lot of posts/threads with this same issue.
Anyways, you should try the following:
1. drain you battery until the phone turns off.
2. switch on phone (it should now say 0%) and drain it, till it shuts down again.
3. charge it to full while swithced off (then take out charger).
4. turn on, let it boot fully and after 5 mins put on charger till it is fully charged.
5. reboot and and in the custom recovery wipe battery stats.
Also this method is depending on the kernel.
TBH, I don't know which isthe best kernel for Oxygen, but stock should do it.
The original version:
This has been taken from the thread on XDA by vidler.
The following steps should significantly extend the battery life on your phone.
Please connect the phone to the charger with the phone powered on, and allow the phone to charge until the notification LED is green, indicating the device is fully charged.
Disconnect the phone from the charger, and power it off.
Reconnect the phone to the charger with the phone powered off, and allow the phone to charge until the notification LED is green.
Disconnect the phone from the charger and power it on. Once the phone is powered completely on, power it off again and reconnect it to the charger until the notification LED is green.
Disconnect the phone, power it on (OPTIONAL: Enter Recovery at this point and Wipe Battery Stats (from Advanced menu), and use it. You need to use this sequence only once.
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I've had the same problem on stock unrooted 2.2. Did a full wipe, root, S-OFF and installed InsertCoinHD yesterday - same issue, hibernation at around 12%-13% battery left.

Phone charging LED green

I have just switched to MIUI RoM and am not sure this has happened on other RoMs, but my phone charge LED has turned green at 91% and is still charging?
This cant be good for the battery can it?
Anyone know why this is happening, all help welcome.

I'm pretty sure that's just how the MIUI rom works, when you get to the 90 percent it just turns the led green. it won't continute to try to charge after it reaches 100%. At least that's the experience I had with it.

Some roms have that setting, that the led is green above 90 percent. Do not think it matters really more than cosmetic.

Thanks guys, yes I left it to charge till 100% and it then said Full charged

It continues to charge at 90% but it reduces the milliamps going in to the battery to make sure it doesn't overcharge the battery
Sent from my HTC Desire using XDA App

shankly1985 said:
I have just switched to MIUI RoM and am not sure this has happened on other RoMs, but my phone charge LED has turned green at 91% and is still charging?
This cant be good for the battery can it?
Anyone know why this is happening, all help welcome.
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All the other replies have valid points and I don't disagree with them, but if it really bugs you, you can try reset the battery stats...
Charge the phone to full capacity (I'd say when every battery status shows full; light, 'About', widgets, etc.).
While still pluged into charger, restart into recovery and wipe battery stats (I think it's under 'Advanced' if you have ClockWorkMod recovery).
Restart normally and unplug charger.
Run device without charging until it turns itself off.
Reconnect charger and turn it on again.
If the ROM is reporting the battery incorrectly, this should sort it out. Otherwise, maybe that's just how it's meant to report battery status...

ZaLiTH said:
All the other replies have valid points and I don't disagree with them, but if it really bugs you, you can try reset the battery stats...
Charge the phone to full capacity (I'd say when every battery status shows full; light, 'About', widgets, etc.).
While still pluged into charger, restart into recovery and wipe battery stats (I think it's under 'Advanced' if you have ClockWorkMod recovery).
Restart normally and unplug charger.
Run device without charging until it turns itself off.
Reconnect charger and turn it on again.
If the ROM is reporting the battery incorrectly, this should sort it out. Otherwise, maybe that's just how it's meant to report battery status...
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Thanks I think its all Ok I never watch phone changing at 90+% till other day, and from what I have read this is ok.
Battery seems really good, getting a day out of it.