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

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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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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deonjahy said:
i think he is talking about this: http://forum.xda-developers.com/showthread.php?t=712990
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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
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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.

[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.
Click to expand...
Click to collapse

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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Click to collapse
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.

[Q][NOOB]battery charging takes a long time

Charging on my stock rom bootloader unlocked htc wildfire s takes about 5hrs from 10p to 100p. I used a wall charger. Is it normal or should i do something,
Cant find the answer after searching
Guide this NOOB please

subinho said:
Charging on my stock rom bootloader unlocked htc wildfire s takes about 5hrs from 10p to 100p. I used a wall charger. Is it normal or should i do something,
Cant find the answer after searching
Guide this NOOB please
Click to expand...
Click to collapse
I've noticed that on my phone it will charge to about 90% and no further sometimes even if charging for 3 days.. But when I reboot it it gives me the actual percentage battery life. Try rebooting after charging it for an hour or 2, and see if the percentage suddenly jumps up. If not then you just need to get a new charger.

Try this and see if it helps.
>Drain the battery completely, till the point it shuts off.
>Take out battery.
>Charge the phone till 100% while it's switched off.
>Boot into recovery. Wipe the battery stats.
>Unplug the charger and boot.
I read somewhere that it's advisable to charge the phone when it reaches below 20% and continuously till 100% (without disconnection). Each disconnection means a new cycle of the battery which degrades the life.

99Aaron99 said:
I've noticed that on my phone it will charge to about 90% and no further sometimes even if charging for 3 days.. But when I reboot it it gives me the actual percentage battery life. Try rebooting after charging it for an hour or 2, and see if the percentage suddenly jumps up. If not then you just need to get a new charger.
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Click to collapse
Yup, exactly. when i restart the phone at 70 or 80% suddenly jumps up to 100p fully charged

sukhjit321 said:
Try this and see if it helps.
>Drain the battery completely, till the point it shuts off.
>Take out battery.
>Charge the phone till 100% while it's switched off.
>Boot into recovery. Wipe the battery stats.
>Unplug the charger and boot.
I read somewhere that it's advisable to charge the phone when it reaches below 20% and continuously till 100% (without disconnection). Each disconnection means a new cycle of the battery which degrades the life.
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Click to collapse
@sukhjit yup me too read the same and i recharge my phone below 20p
And will give a try to your first method, but could you suggest me a recovery - any custom recovery possible in an s-on bootloader unlocked, rooted wildfire s.
Thank you in advance

sukhjit321 said:
Try this and see if it helps.
>Drain the battery completely, till the point it shuts off.
>Take out battery.
>Charge the phone till 100% while it's switched off.
>Boot into recovery. Wipe the battery stats.
>Unplug the charger and boot.
I read somewhere that it's advisable to charge the phone when it reaches below 20% and continuously till 100% (without disconnection). Each disconnection means a new cycle of the battery which degrades the life.
Click to expand...
Click to collapse
And as you told, i have turned off autosync, disabled automatic brightness, animation, wifi, gprs

subinho said:
@sukhjit yup me too read the same and i recharge my phone below 20p
And will give a try to your first method, but could you suggest me a recovery - any custom recovery possible in an s-on bootloader unlocked, rooted wildfire s.
Thank you in advance
Click to expand...
Click to collapse
I Use CWM 5.0.2.8...

sukhjit321 said:
Try this and see if it helps.
>Drain the battery completely, till the point it shuts off.
>Take out battery.
>Charge the phone till 100% while it's switched off.
>Boot into recovery. Wipe the battery stats.
>Unplug the charger and boot.
I read somewhere that it's advisable to charge the phone when it reaches below 20% and continuously till 100% (without disconnection). Each disconnection means a new cycle of the battery which degrades the life.
Click to expand...
Click to collapse
@sukhjit, Did the same... No difference
I checked the battery information while charging. Jumps to 4228mv then charges slowly. If I disconnect the charger and reconnect then the voltage drops to a value, and again jumps to 4220mv after a 2-3pc rise in battery charge.. then charges slowly taking about 5 hrs for full charge. What should I do??

subinho said:
@sukhjit, Did the same... No difference
I checked the battery information while charging. Jumps to 4228mv then charges slowly. If I disconnect the charger and reconnect then the voltage drops to a value, and again jumps to 4220mv after a 2-3pc rise in battery charge.. then charges slowly taking about 5 hrs for full charge. What should I do??
Click to expand...
Click to collapse
You could try replacing the battery! If this doesn't help most probably the battery is at fault. If any friend or family has a htc phone with same battery, you can ask for a one day exchange and find out if it's the battery or phone.
---------- Post added at 05:27 PM ---------- Previous post was at 05:26 PM ----------
Also Are you using original htc charger? Charging from PC takes a lot longer as PC supplies less voltage to the phone.