Develop Bugs

[HOW TO] Calibrate Desire Battery

Found this on another forum, I have done this a few times myself (do it whenever i flash a new rom because i always clear battery stats, can't hurt). Have found that it does top it up a fair bit. Before doing this i find my desire will drop to +-93% straight off the charger, however this keeps it 100% longer and i actually get to see the numbers 99-94%
Worth a go in my opinion because it only takes 5 mins of your time and can't hurt the phone... So any minor gain from this process is a win...
Hi *******, I understand your concern regarding battery life on your Nexus One device. 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, and use it. You need to use this sequence only once. If the issue of battery life on our phone persists, I recommend you contact our HTC accessory department directly.
Mod Edit: There have been a few reports of damaged batteries by people on this thread. There is a chance that this MAY damage your battery. Please bear this in mind if you choose to follow the instructions above.

supportyou and the app!
Sent from my HTC Desire using XDA App

Thanks for that. At what point do you wipe battery stats? After the process is complete?

desire888 said:
Thanks for that. At what point do you wipe battery stats? After the process is complete?
Click to expand...
Click to collapse
Also wondering about this

You should wipe battery stats after its fully green (when powered off) then boot the phone back up.
You only need to do this once
I.e.
Charge till full when powered on
power off
charge till full again
boot into recovery wipe stats
boot and continue to use as normal

It works!!!
That's fantastic!
I read this topic this morning and tried immediately. Since this morning i only lost 4% until now. That's great news!
Thx a lot, man!
Sent from my HTC Desire using XDA App

thanks!!!!
battery usage is much better now!

how do you wipe batt stats?

kmetek said:
how do you wipe batt stats?
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Click to collapse
Via ClockWorkMod recovery

kmetek said:
how do you wipe batt stats?
Click to expand...
Click to collapse
Clockworkmod recovery -> advanced -> wipe battery stats.
Sent from my HTC Desire using XDA App

do i have to repeat that in future again?

vidler said:
You need to use this sequence only once.
Click to expand...
Click to collapse
first post

takes a long time to charge my Desire, but then i'll test this one!
Hope this will make battery life better. I have the same problem as described in first post (drops immediatly from 99% down to 93% )

Can someone suggest me how should I go about doing this if I use multiple batteries?
I'd imagine the phone can only be calibrated to 1 battery. But if I were to use another battery, would I screw up the calibration to the original batteries?
Right now as it is with moderate usage I need 3 batteries to last me through the day. :S

xNavyblue said:
Can someone suggest me how should I go about doing this if I use multiple batteries?
I'd imagine the phone can only be calibrated to 1 battery. But if I were to use another battery, would I screw up the calibration to the original batteries?
Right now as it is with moderate usage I need 3 batteries to last me through the day. :S
Click to expand...
Click to collapse
3 batteries?!
What rom are you using and how exactly are you using your phone?
I have just one battery and it lasts about 2 days with moderate use.

I am using this ROM: (sorry can't post link)
[ROM] Rooted Official HTC Android 2.2 (FroYo) ROM [Market issue fixed]
With my typical usage, I unplugged the phone in the morning from the charger, by the time I knock off from work, I would have left about may be 20%. With stock ROM and a single battery, there is no way that I could last 2 days with one single charge. My main use is web browsing, RSS, Facebook and IM. My estimation of my solid screen time is about 2-3 hours.
So I bought more battery just in case, and played with custom ROMs. I ended up using up a whole battery in 4 hours or so. Definitely something is wrong here. My gut feel is that both the ROM and batteries are suspects. Being a newbie I really need enlightenment.

Is it really needed to wipe the stats? I think I've accidently done this once already... cause the battery life is much better.

since this procedure, my battery stays at 100% since nearly 2 and a half hours now and i did 2 text messeges in between and recently checked the bat about 4 times
this couldnt be possible..
i mean the battery is almost doubled in comparison to how long it lasts before
is this possible??

yes it is possible

Dany0 said:
yes it is possible
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Click to collapse
but how?
i mean in this time the battery would have been dropped to arround 97
and now its still full?
i mean these are stats how are they increasing battery life? the batterylife is given from the cell itself?

Creepy battery drain: 100 to 0 in 1 hour!

Hey people. I am having the wiriest problem. So, i get a refurb evo, and it seems to be running great, so I root it. I flash myns 4, and then the ziggy kernel meant for that rom. I also flash a couple of the visual mods. Then, all of a sudden, i start having incredible battery drain. I am dropping more than 1 percent a minute! There is obviously something wrong here. I have data and 4g on, but controlled by ultimate juice. Other than that, nothing. I really want to be able to use my phone again, and this is pretty debilitating. Anybody have any ideas? Thanks.
Btw, my battery info has android systems and cell standby at the highest, even though I have had my phone mostly on idle. This is not normal, or even wird. This is plain old creepy. Where is all that power going? And more importantly, is it possibly causing permanent damage?

I don't suppose you flashed the rom with a full battery did you?
you have to have a full battery when you flash roms.
Sent from my PC36100 using XDA App

Sounds to me you got a crap refurbished phone. That kind of drain shouldn't happen under any circumstances.

Wow quick replys. I think I flashed the rom with pretty low battery. Could this be the problem? Can I just recharge to full and then wipe battery stats? Is it even truly full? I agree with the possibility of a crap refurb. My meter said 56 like 20 minutes ago. Now I have 4. Not good.

dkdude36 said:
Wow quick replys. I think I flashed the rom with pretty low battery. Could this be the problem? Can I just recharge to full and then wipe battery stats? Is it even truly full? I agree with the possibility of a crap refurb. My meter said 56 like 20 minutes ago. Now I have 4. Not good.
Click to expand...
Click to collapse
I would definitely try charging then wiping battery stats first, but the battery drain issue could be the reason it was refurbished in the first place.

Just what I was thinking. The only problem is, how will I fill up the battery all the way? I know the kernel puts charging in a loop after a certain point, so isn't it impossible to go past my present 100 percent? Confusing stuff. Will send email to sprint and htc asking about it.

Ok before you flashed this ROM did you do a full wipe(cache, and Dalvik)? Even before you flashed did you make a nandbackup? Was the phone getting hot?
What I would do is if you have a nandbackup then do a factory reset/wipe cache, then wipe Dalvik then flash your old ROM. See if the probelm goes away. If it does then either the ROM you flashed, or the other stuff you installed fouled up something in the phone.

dkdude36 said:
Wow quick replys. I think I flashed the rom with pretty low battery. Could this be the problem? Can I just recharge to full and then wipe battery stats? Is it even truly full? I agree with the possibility of a crap refurb. My meter said 56 like 20 minutes ago. Now I have 4. Not good.
Click to expand...
Click to collapse
turn the phone off then charge it til the light turns green. then unplug it and plug it back in. then wait til it turns green again. do that a few times to make sure it is full. then wipe your battery stats. then wait til your battery dies and the phone turns off. then while it's still off charge it til the light turns green. turn it back on and you're good to go. it takes a while but it's totally worth it
Sent from my PC36100 using XDA App

Jdog I have tried unplug and replug (not with wiping, I will try that) and charge for 8hours, unplug, turn off, charge for 1, unplug, turn on, wait 2 minutes, turn off, charge for snot her hour, both without success. I will do the wiping thing though. Kmf i did wipe well with Amon and make a backup. Will try a fresh rom install, wipe, restore, and even an unroot if I have to. Any more suggestions?

you gotta wipe battery stats. that's the important part
Sent from my PC36100 using XDA App

[Q] Seriously? Cyanogen ROM kills battery like this?

I have done a bunch of reading since my first flash to Cyanogen's 6.1 but not finding really satisfactory answers.
With the old rooted stock deodexed...I was getting about 14-15hrs of moderate-high use. So basically I pulled the cord at around 7am and plugged back in around 6pm with about 40%.
Was fine.
Flashed 6.1 last night and now I am two hours off charge and sitting at 58%!! I have all syncs turned off and I have no wifi/gps/4g running. The ONLY widget at the moment is weather and it only updates when I hit refresh.
My search has shown something called battery calibration...but that doesn't make sense to me. I have done the long charge, power off charge, power on charge etc... But since I have a wall battery charger I have just moved away from that and occasionally swap out my batteries for a full charge in that thing.
Does that 6.1 REALLY need another voodoo approach to battery life? Also the threads I have found seem to be for the nexus one or the HTC Magic(?).
Anyone else suffering HORRIBLE battery life after flashing 6.1?
Anyone got a link to a fix for the EVO and maybe something that I can get through the day with (do not have my charger at work)?

When I flashed CM7 to my wife's phone the battery was horrible (Less than 2 hours). I recalibrated the battery and the next charge lasted 2 days. Give this a try:
Battery recalibration
If you're experiencing higher than normal battery drain, try the following:
Charge the device 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 device -> Status -> Battery Level = Full.)
Boot to recovery mode and delete the battery stats
NOTE: To have the most accurate of battery stats, reboot the device immediately after wiping the battery stats and wait for CyanogenMod to boot completely to the desktop. Once your entire boot is done and you have full access to the device, go ahead and pull the charger and continue with this troubleshooter.
Do not charge the device until after draining the battery completely, resulting in it automatically shutting off.
Recharge the device completely and then use as you normally would.
Also, CM6.1 or CM7 should get decent battery life. If it still doesn't try flashing a different kernal. I found that savaged zen bfs sbc kernal extended my life considerably.

sablesurfer said:
I have done a bunch of reading since my first flash to Cyanogen's 6.1 but not finding really satisfactory answers.
With the old rooted stock deodexed...I was getting about 14-15hrs of moderate-high use. So basically I pulled the cord at around 7am and plugged back in around 6pm with about 40%.
Was fine.
Flashed 6.1 last night and now I am two hours off charge and sitting at 58%!! I have all syncs turned off and I have no wifi/gps/4g running. The ONLY widget at the moment is weather and it only updates when I hit refresh.
My search has shown something called battery calibration...but that doesn't make sense to me. I have done the long charge, power off charge, power on charge etc... But since I have a wall battery charger I have just moved away from that and occasionally swap out my batteries for a full charge in that thing.
Does that 6.1 REALLY need another voodoo approach to battery life? Also the threads I have found seem to be for the nexus one or the HTC Magic(?).
Anyone else suffering HORRIBLE battery life after flashing 6.1?
Anyone got a link to a fix for the EVO and maybe something that I can get through the day with (do not have my charger at work)?
Click to expand...
Click to collapse
Thats a old cm, cm is now cm 7... maybe try that one..
Sent from my PC36100 using XDA Premium App

Yea Cm6 is dated. But that shouldn't matter.. I actually had fantactic battery when I was on cm6, much better than what I get on cm7.
First, check spare parts for wakelocks and make sure you don't have any. After that, follow Fazulkas advice to reset battery stats, follow it correctly tho. I never thought wiping stats would make a difference, but it surely does.

Ok, I'll try that process when I get home tonight. (Guess I can survive w/o a phone for a few hours?!?! :^O) Haven't set up more than just the google account on this ROM as I wanted to test it first. So maybe tomorrow it will win me over.

DATED?!?! LOL! It was only just a final release a few months back...;^) It has all the important stuff working where as 7 doesn't and it is still a RC.
:^P
(Have you seen my sig? Old dogs only try the proven tricks thank you very much. :^)

CM6 is not dated. In fact CM 6.1.3 is the most current stable-release version of CM available!
Sent from my PC36100 using XDA App

Its not the ROM. Anytime you flash a ROM, you need to calibrate your battery. By calibrate it isn't the plug in over and over method.
You charge to 100%, discharge it fully. Charge back to 100% then wipe battery stats in recovery. Then use your phone.

Flashed 6.1 last night
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Click to collapse
There is your problem. Anytime you flash a new rom, you need to give it at least a day or two to fully calibrate everything in the rom.

sekigah84 said:
Its not the ROM. Anytime you flash a ROM, you need to calibrate your battery. By calibrate it isn't the plug in over and over method.
You charge to 100%, discharge it fully. Charge back to 100% then wipe battery stats in recovery. Then use your phone.
Click to expand...
Click to collapse
HUH...this is my fourth ROM flash, first one away from stock rooted and I have never had this issue. Maybe the stock ROMs do not have this issue?

[Q] Need help with battery

hi all , i used my htc wildfire for 8 month and at first my battery displays 100% when its full but since 3 month till now it always display around ~ 40 - 60 % and can't increase more . So someone can help me . Thx for read and sorry for my bad english

Are you using custom ROM or the stock ROM that comes out of the box(Froyo v2.2) ?
If, you are on custom rom, then you may try deleting the batterystats.bin present in /data/system. But first charge your wildfire, and if your removing your wildy from the charger after it gets the green led indicator, then wait till it reaches the 100%. In my case my wildy gets the green indicator in 90% but I wait till it reaches the 100%.
So, when you get to 100 reboot into recovery and select the option "delete the batterystats.bin" in wipe section. and then use the phone till it reaches 20% and then connect to charger but this time make sure you do not use the phone till it reaches the 100%(you may charge it when its switched-off.).
Note: charging through USB connected to PC gives a better battery life than the adapter provided for charging.
If, you are not getting 100% as previously mentioned, then also you can try deleting the file using recovery. You can download an app from market which will also do the same "Battery Calibration".

I have same problem too. My battery charge till 75 % and then stopped, i charged it on turned off and then turned on. I tried to install Battery calibration but this app doesnt let to calibrate battery till is not on 100 %. Also I tried to unroot the phone, some say that it will helo but still useless.
Sent from my Wildfire using XDA

@Justin5 : "Also I tried to unroot the phone" if you haven't unrooted it then you can try to delete the batterystats.bin file from recovery(explained in the previous post). If you have unrooted your phone, then you will have the stock Sense ROM v2.2. In that case also, your battery backup will decrease.
So, better stick to any custom rom. I am now using SplashMOD v1.6. Its fast, stable and backup is also good with some customization. You can try CM-7,RemPuzzle also(try searching in CM7 post for the stable ROM, you can read reviews to get a better idea).
Note: You haven't told of the ROM you are using.

Batterystats.bin contains information about what uses the battery doesn't it? I don't think it tells it how much charge to hold + it gets deleted everytime you wipe and flash so I don't see how deleting that file can help.
Sent from my Wildfire using xda premium

I was reading an article on this the other day in the android forums,and I believe it was saying that wiping the battery stats does absolutely nothing even in regards to calibration. I might have read wrong but I'm sure that's what it was insinuating.
one minute it works,the next it doesn't......yes that's right its the crappy xda update.

slymobi said:
I was reading an article on this the other day in the android forums,and I believe it was saying that wiping the battery stats does absolutely nothing even in regards to calibration. I might have read wrong but I'm sure that's what it was insinuating.
one minute it works,the next it doesn't......yes that's right its the crappy xda update.
Click to expand...
Click to collapse
Battery calibration does work (at least it did for me, when my battery discharged in 1 hour on my and worked normally after calibration on my tablet)

Don't shoot the messenger lol.the article (not me) was saying that just a good old discharge and recharge is enough and wiping stats is pointless. If I can find it I will link it.
one minute it works,the next it doesn't......yes that's right its the crappy xda update.

deteling the battery status can work but if the battery has some damage will stay that way, i hate the battery for the wildfire, it does not last very long...

www.xda-developers.com/android/goog...-battery-stats-does-not-improve-battery-life/
Nuff said!!

slymobi said:
I was reading an article on this the other day in the android forums,and I believe it was saying that wiping the battery stats does absolutely nothing even in regards to calibration. I might have read wrong but I'm sure that's what it was insinuating.
one minute it works,the next it doesn't......yes that's right its the crappy xda update.
Click to expand...
Click to collapse
I also noticed the difference before and after wiping the batterystats.bin when I was in SplashMOD v1.0. The backup also get increased if the battery is charged through USB till it gets 100%.
But, If the phone has been continuously used without the complete charge cycle, then the battery life will get decreased.

rajumack07 said:
I also noticed the difference before and after wiping the batterystats.bin when I was in SplashMOD v1.0. The backup also get increased if the battery is charged through USB till it gets 100%.
But, If the phone has been continuously used without the complete charge cycle, then the battery life will get decreased.
Click to expand...
Click to collapse
I'll say it again for the hard of hearing, Its not possible for batterystats.bin to affect battery life in any way.
When you go to settings/battery where it tells you what %of the battery has been used by what, that is the only information stored in batterystats.bin and nothing else, it also resets itself every single time you fully charge the phone so no need to wipe it as chances are you already have not long ago.
Yes discharging the battery fully and then recharging fully will prolong battery life, but its not always practical to do so and even if you do, all batteries will come to the end of there life sooner or later.
Sent from my Wildfire using xda premium

[Q] HTC G2 Wrong Battery % Reading after custom rom flash

i recently flashed an ics rom to my htc g2, after flashing it all worked perfect but the phone was reading the battery incorrectly.
do any of you have the same problem? if so do u know of a way to fix this??

wipes battery stats in recovery, charge fully (let is sit overnight to be safe) wipe battery stats again in am. let it drain to around 15% let it charge full (again overnight if possible) then see if you good, i have ocd so id probably wipe stats again just for safe measure.
if this wont help more info will be needed to trouble shot your problem

demkantor said:
wipes battery stats in recovery, charge fully (let is sit overnight to be safe) wipe battery stats again in am. let it drain to around 15% let it charge full (again overnight if possible) then see if you good, i have ocd so id probably wipe stats again just for safe measure.
if this wont help more info will be needed to trouble shot your problem
Click to expand...
Click to collapse
thanks for the reply.. im doing what u said now. will post tomorrow to let u know what happend okay.

demkantor said:
wipes battery stats in recovery, charge fully (let is sit overnight to be safe) wipe battery stats again in am. let it drain to around 15% let it charge full (again overnight if possible) then see if you good, i have ocd so id probably wipe stats again just for safe measure.
if this wont help more info will be needed to trouble shot your problem
Click to expand...
Click to collapse
As far as I know, battery stats are wiped every time you unplug from power with a full charge.
Also, battery stats have nothing to do with the battery % indicator.
Please read this and this.

shared_ptr said:
As far as I know, battery stats are wiped every time you unplug from power with a full charge.
Also, battery stats have nothing to do with the battery % indicator.
Please read this and this.
Click to expand...
Click to collapse
yes I've read similar articles to those before, thing is I don't belive it wil give you more battery life, that's just silly. for the occasional time my battery indicator has been off, and rebooting alone doesn't work, wiping the bat stats does. now maybe this has just been a coincidence but it has never failed me. if it happens again ill just plug and unplug my phone to see if it helps... or ill just stick with wiping the stats and won't complain if it doesn't work
Sent from my HTC Vision using xda premium

hey guys... ive done the battery status wipe but no luck my phone reads the wrong battery percentage. idk what to do now. last thing im thinking is reverting back to stock froyo, were battery stats were being read correctly. also i found a gb rom called PantsRom, its based on the stock gb update for the HTC Vision, with all bloat gone and rooted with stock Vision kernel. im going to try that rom out today after i get off of school and see what happens. will post back then. again THANKS SO MUCH FOR THE ADVICE AND THE HELP!

just flashed PantsRom (Android 2.3.3) left stock with all bloat removed. (no overclock) will post back to c if battery is correct. Hopefully itll be okay :good:

battery still wont read correctly. last thing i have left to do is to go all the wayy back to froyo and loose root.. well c what happens then
EDIT - Even after reverting VERYTHING back to stop the battery did not seem to be reading correctly... UUGGHHH!!! PLEASE HELP!

Have u tried running the battery down to nothing?
Run till the phone simply wont stay on and try to charge it to full from there (like over night)
then maybe wipe battery stats again
however i do believe battery stats are wiped every time a full charged is achieved like mentioned above.

bob232149 said:
Have u tried running the battery down to nothing?
Run till the phone simply wont stay on and try to charge it to full from there (like over night)
then maybe wipe battery stats again
however i do believe battery stats are wiped every time a full charged is achieved like mentioned above.
Click to expand...
Click to collapse
done that several times.. right now im running the phone with the wrong battery % STILL hahahaha, i jst carry my charger everywhere just incase.. FML ik ik, have any of you got any diff suggestion, or gone through the same problem im going through? if so, have yall found a fix for it.. i have searched all over the net..