Database Users

Proper way of calibrating battery?

Hi folks, I'm running CM6 8/26 nightly with Snap v7.4 kernel with SetCPU set to conservative on 998mhz max and 245mhz min. I'm getting horrid battery life and I think I'm doing something wrong: I wiped battery stats in Clockwork and now my battery SUCKS. -.-
Question is, what its the proper way of calibrating an Evo battery? I've seen the official HTC response but I don't think it's going to make a difference. Isn't there another method that requires you to drain the battery? Any info will be appreciated I've been looking at forums all day.
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letshaveDEX said:
Hi folks, I'm running CM6 8/26 nightly with Snap v7.4 kernel with SetCPU set to conservative on 998mhz max and 245mhz min. I'm getting horrid battery life and I think I'm doing something wrong: I wiped battery stats in Clockwork and now my battery SUCKS. -.-
Question is, what its the proper way of calibrating an Evo battery? I've seen the official HTC response but I don't think it's going to make a difference. Isn't there another method that requires you to drain the battery? Any info will be appreciated I've been looking at forums all day.
Sent from my PC36100 using XDA App
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You can't just wipe battery stats - there's a process to go through. What you're referring to is Cyanogen's battery recalibration method found here. Read through fully before wiping anything.

Thank u very much, I wiped the stats by mistake
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fachadick said:
You can't just wipe battery stats - there's a process to go through. What you're referring to is Cyanogen's battery recalibration method found here. Read through fully before wiping anything.
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Actually it is almost as simple as wiping battery stats. That command he gives is what the wipe battery stats command in the recoveries do.
1. Charge battery to full (where it's actually 100% not green light.
2. Boot into recovery wipe battery stats.
3. Fully boot into os then unplug charger.
4. Leave unplugged until the phone shuts itself off.
At that point you should be calibrated.

On a related topic, the Battery Graph app available in the market also has an option to wipe battery stats from within the OS, doesn't it? Might save having to reboot into recovery once you're charged up.

It's a lithium battery. You can't condition it. Just use it as normal and ignore all these placebo effect steps.
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daving313 said:
It's a lithium battery. You can't condition it. Just use it as normal and ignore all these placebo effect steps.
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This is all about calibrating the software (battery stats).

daving313 said:
It's a lithium battery. You can't condition it. Just use it as normal and ignore all these placebo effect steps.
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They're not calibrating the battery. they're calibrating the phone to know when the battery is really fully charged which, until you do this, is not the case when the charge light turns green.

Regardless, none of this worked. I've quit all services, no sync, auto brightness and wifi and I'm still getting horrible battery life. SetCPU is set to conservative. It's BULL**** my display is on for thirty minutes and the battery dies 20%. I played a game on my friend's iPhone 4 for twenty minutes and his battery barely died 3%. This is really unacceptable and I'm probably going to return my Evo or sell it if the battery life doesn't get better soon from these methods I'm seeing online
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Crazy man, maybe something happened cause that is pretty bad.
Have a backup to go back to, prior to this happening, to see if it reverts back to normal?

Naw nothing happened to my phone...... All of us Evo owners should be able to use this beautiful phone with all of the features at max without the battery going to ****. My phone has behaved this way since unboxing. I'm not a big fan of the iPhone 4 but I will give it props on battery life. I have yet to try the longer HTC method but it seems kind of pointless.....
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If it has always been like that then you may have a bad battery, if it started after you wiped the battery data then it is just showing you bad readings.
You should be able to get a good calibration if you reset your battery data again, maybe try through your recovery if possible, and then fully charge it with your phone turned off. Once it is charged you can either use it normally till it dies or you can tether, use gps, watch youtube, etc, and drain the battery down. Just make sure you go from a full charge to the phone shutting itself off without plugging it in to anything. Do that charging with it off and using it till it dies two or three times and your battery stats will be calibrated.
When I did this to mine it showed my battery at 0% for at least half an hour before it finally died, and that was with me listening to pandora and browsing the web.
Edit: FYI, the Evo's talk time is usually between 6.5 to 7.5 hrs, the iPhone 4 is around 7 hours also. If your battery is not lasting that long you need to take it in to sprint and have them give you a new battery.

letshaveDEX said:
......I have yet to try the longer HTC method but it seems kind of pointless.....
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Click to collapse
HTC's method worked wonders for me. i'm a heavy heavy HEAVY user (no, not fat) and I get a good 10 hours with everything besides 4g on plus surfing, gaming and tethering for SEVERAL hours. For all that I do on my EVO 10 hours is HUGE. If I have a moderate day of usage (maybe a little more than moderate for the average user) I get around 19 hours.

Btw none of this will help if you are getting near 100% awake time. If that's the case you need to find the software causing that first.
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Try this, it helped me. I did not come up with this btw.
With phone on, charge until green.
Unplug and turn phone completely off.
Charge phone until green once again.
Unplugand turn on. Once phone had turned completely on turn the phone back off again.
Charge until green one more time then unplug and turn on and you're done!
Sent from my Htc Evo 4g

Battery Charging

I noticed something recently. My epic used to SUCK with battery life and took really long to charge. I've flashed a few roms over with ext4 etc, but I am now on stock dk28, (rooted+cwm2.5). Now what I noticed is that my battery charges really fast now even with wifi. BUT i m kinda thinking that maybe the battery statistics are not right? The batery seems to stay charged for a good time now too. Now, I am wondering why this could be. Three things I'm thinking:
1. I remember switching batteries with a vibrant before but I thought I switched them back. I don't know maybe I didn't now that I think about it?
2.flashing roms at random times/ when the battery was low. BUT I did odin back to stock 2.1 after all this..
3.Battery conditioning?
Thanks guys for any feedback.
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What's really funny I just odined back today and I'm noticing really great battery life.
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when u flash to a new rom that significantly different than the previous rom you had you need to get your phone fully charged, power off and wait for it to complete charging again then boot into clockwork,unplug,wipe batt stats, boot and dont plug in untill the batt dies and phone powers off. This will let android gauge your batt....i've notice that flashing a new rom with a low charge seems to really throw off the bat stats

BopChie said:
when u flash to a new rom that significantly different than the previous rom you had you need to get your phone fully charged, power off and wait for it to complete charging again then boot into clockwork,unplug,wipe batt stats, boot and dont plug in untill the batt dies and phone powers off. This will let android gauge your batt....i've notice that flashing a new rom with a low charge seems to really throw off the bat stats
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That's not entirely accurate. Android gauges it on a full battery CYCLE. you don't have to go from full to dead. You should always start full though. You can run from full, to 50%, plug it in, back down to 50%. That would complete one full cycle. Theres a thread with all the info on it. I'd link it but I'm on my phone.
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JBakey said:
That's not entirely accurate. Android gauges it on a full battery CYCLE. you don't have to go from full to dead. You should always start full though. You can run from full, to 50%, plug it in, back down to 50%. That would complete one full cycle. Theres a thread with all the info on it. I'd link it but I'm on my phone.
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Gauges a full cycle, beeing the FULL cycle of the battery... i.e fully charged to fully drained... then it knows the capacity

That is all completely unnecessary. Just charge it to full, power off, boot into clockwork, wipe battery stats, restart. No other steps are required to calibrate your battery.

Or just simply use the phone normally and it will balance itself out naturally in a couple days. Charging is always quick for me "if" I'm not doing data and resource heavy tasks.
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I do bump charging or quick charging or whatever its called.
The hero would charge to like 35% in 10minutes. The epic only charges to like 5% in 10minutes lol
I hate the epic battery. But when its fully charged, it lasts the day for me.
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My epic battery used to be terrible, 4hours. But with little no changes im getting at least 12 hours or moderate use wifi, GPS, auto bright, and 3 or 4 widgets. i can only think that the battery has been conditioned.
Also i flashed the EB13 from here this morning with setCPU and i'm getting at least 4 more hours. Also charging is faster 30% in 60 minutes.

[TIP] Battery Life and Calibration

Hey guys,
I'm sure most of you know about the Battery Calibration app on the market.
For most of you, calibrating at 100% charge should significantly increase battery life.
After playing around, it seems that the phone can't seem to "keep" a sustained "track record" in battery life over the days and repeated charging.
Once calibrated the first time, battery life seems to be exceptional. Allowing the phone to die and charging again without calibration seems to degrade the battery life yet again. It's definitely something with the batterystats file.
Also, once calibrated, if your phone is charged (lets say from 25%) to give yourself some extra juice, and you do not hit 100%, remaining battery life seems to suffer.
I've repeated this multiple times as well. Last night, I charged from 25% to 54% and my phone couldn't keep a good charge and dropped to 19% with light usage in about 2 hours.
The Point: Calibrate your battery every time you hit a 100% charge. (For me, each morning). By doing this, I've went from 6-8hrs of total battery time to about 22-30hrs.
I've even managed to squeeze out 2.5hrs of display time as well.
Maybe the dev of the app should add an automated scheduling feature, or one that calibrates every time the device hits 100%.
Hope this helps!

Im going to try this, charge is at 80% so i'll throw it on charger, and then calibrate at 100. I hate how the battery in this phone is so sporadic, i've only gotten 30 hours out of it once. and never again.

Do u sure it affects a lot?
Swyped from MB860

alistair3149 said:
Do u sure it affects a lot?
Swyped from MB860
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Made a huge difference for me, give it a shot.

charged to 100% and then calibrated the battery, i will update you on how it fairs, and what kind of usage i do. I usually am pretty low on battery by the time im on my way home in about 6 hours.

alistair3149 said:
Do u sure it affects a lot?
Swyped from MB860
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It varies for everyone; hence "calibration". This gives people the battery life they should be getting.

This usually only makes a (or I should say the most) difference with freshly factory reset phones, or right after flashing a custom rom.

binary110 said:
charged to 100% and then calibrated the battery, i will update you on how it fairs, and what kind of usage i do. I usually am pretty low on battery by the time im on my way home in about 6 hours.
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Nice, let us know how it goes.
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1 hr 50 minutes unplugged so far,
15m 7s display @ 26%
3m 9s Voice calls @ 18%
idle @ 15%
wifi 9%
SYStem 8%
standby is 7%
com.motorola.service.main 4%
launcherpro 4%
android OS 3%
Email 2%
Only down 10% battery. normally im down roughly 10%/hr when ive so much as used voice/email.

I agree with the OP... This seems like a much safer way to keep the battery accurate, etc. I was told a while ago that the Battery calibration app doesn't work right on the atrix, so I was told to manually wipe the stats in CWM, then let the phone die and then recharge to 100%...BAD idea. Battery seemed completely fried after this, only about 1/4 as long as it did before.
I think the app does work, and it's much safer. I don't really recommend ever letting the phone die though, after what happened to me. Could have been a freak accident, but not taking that risk again!

28h 30m, 46% battery left.
2h display
30m talking
30m plants vs zombies
All I've ever done is charge phone to 100% first charge, let it completely die, and then only charge to 100% at night, with occasional car charger use.
I wouldn't suggest completely decharging battery regularly, it deteriorates lithium ion batteries faster
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I never let mine die completely either. Ill usually put it up to charge at night once it hits about 20% or so. Calibrating once in the morning seems to get me through the day pretty well.
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80% battery remaining. 5hr 2m 5s since unplugging.
32% - Display 53m 0s (rare for an even number)
14% voice calls 7m 2s
13% idle - 4h 9m 7s
8% wifi - 4h 52m 5s
7% android system.
6% cell standby
5% swype
3% android os
3% maps
2% com.motorola.service.main
2% LauncherPro
This is definitely better than usual. 2 hours in, i was at 80%. now after 5 hours, im at 80%...
On a side note, The phone hasnt gotten hot in my pocket like it usually does today as well.

silentecho13 said:
I never let mine die completely either. Ill usually put it up to charge at night once it hits about 20% or so. Calibrating once in the morning seems to get me through the day pretty well.
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How long have you had your phone? Mine really didn't start performing well until I had had it for 3 weeks or so. I did a flash to the 1.83 SBF (at 100% battery - equal to a recalibration) and haven't shut it off in like 10 days. No recalibration and I can get at least 18 hours of use (with like 4-5 hours of screen time).
tl;dr - I don't think you need to recalibrate all the time

How do you figure the 100%, since the battery goes from 90 to 100.
Do you just let the battery calibration app beep when it measures 100%?
Thanks.

Which battery calibration app did you download?
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I used this app:
http://market.android.com/details?id=com.nema.batterycalibration
As for my phone, I've had it since launch day on at&t.
Another thing to mention: add a screen-off profile using setcpu as well, definitely helps.
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charlyee said:
How do you figure the 100%, since the battery goes from 90 to 100.
Do you just let the battery calibration app beep when it measures 100%?
Thanks.
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Click to collapse
Yes, the app will notify you when your phone is at 100%, as well as the text reading "charged" on the lockscreen.
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Funny, i was just about to post in an older battery thread about similar issues as the op. Ill give this a shot
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BBock9 said:
Funny, i was just about to post in an older battery thread about similar issues as the op. Ill give this a shot
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Let us know how it goes!
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Phone won't charge past 95%

OK so I'm having a issue with the 2.3.4 rom I'm on the latest cherry blurr on the stock radio also stock kernel and my phone won't charge past 95% I'm using transfer recovery to install the rom and also I use fastboot to wipe the phone before any rom install, can anyone tell me why im having this issue and I have wiped battery stats before
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You have to keep it charging even at 95.it does take some time to charge beyond 95%.

When it hits 95% the charging status shows the phone is unplugged but the phone is plugged in
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Did you try running CWM and resetting your battery stats? Do that once you've reached 95. Then let it drain completely. Then charge it to F. Then reset the battery stats again. I did that when mine wouldn't go beyond 99.

My ATRIX does the same thing, just leave it in until it reaches 100%. it will take a little while but it'll work.

rdubyah said:
My ATRIX does the same thing, just leave it in until it reaches 100%. it will take a little while but it'll work.
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I've left mine on overnight and it stops at 98.. gonna drain and recalibrate
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Mine gets All the way to where it says phone fully charged. But as soon as I unplug it, it says 99%. Did a battery wipe then giving to let drain and recharge and will, wipe battery status again. Will report back.
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The phone will charge upto 100% and then stop till it hits around 95% again(not exactly 95% but example). This is a safety feature to protect the battery from charging continuesly.

Alright ill let it charge some more now and report back
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phro321 said:
Mine gets All the way to where it says phone fully charged. But as soon as I unplug it, it says 99%. Did a battery wipe then giving to let drain and recharge and will, wipe battery status again. Will report back.
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let us know how you get on as i have the same exact problem
Wiped and recalibrated and it's still the same. The second i unplug it goes down to 99 and pretty much downhill for the rest of the day
I think there is a general issue with the battery and GB and i don't think there is a concrete fix yet.

Thanks guys phone charged to 100% gave it some extra time
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If this happens, there is no need to drain the battery.
Boot into CWM and clear the battery stats.
Download Battery Calibration from the Market.
Start Battery Calibration, (and leave running).
Put your phone on charge with the AC charger. The phone will take a while to get to 100%, especially the last couple %.
You will hear a chime when the battery is fully charged. Leave charging for another 15 minutes, (sometimes if you unplug it right after it hits 100% it drops to 99% straight away).
Calibrate with Battery Calibration.
Enjoy.

Thanks for the tip!

Mine's been stopping at 98. It gets to 95 at a normal pace that I'm used to seeing with this phone, then takes probably 8-10 hours to get up to 98 and then just stops there and won't charge any more, no matter how long I leave it in. The OP said he just gave his extra time and it eventually got back up to 100...but how much extra time should I be giving it? No amount of calibration has helped me yet.
Any thoughts?

what I have done is when the phone is close to charged but not fully is to wipe the battery cache, then connect it to charge. for the first few charges it will stay at 100% for some time before it starts to drop, an it will drop faster then it should and be out of power before it hits 1% but on the 3rd charge it always seems to calibrate itself. I do not drain it fully just till it is pretty low. To put in hard number fully charged it is about 4200mV and so I wipe the battery stats close to 4150 and charge when it gets around 3700
do this a few times and for me at least the battery seem to be pretty well calibrated.

thebeardedchild said:
Mine's been stopping at 98. It gets to 95 at a normal pace that I'm used to seeing with this phone, then takes probably 8-10 hours to get up to 98 and then just stops there and won't charge any more, no matter how long I leave it in. The OP said he just gave his extra time and it eventually got back up to 100...but how much extra time should I be giving it? No amount of calibration has helped me yet.
Any thoughts?
Click to expand...
Click to collapse
Have you tried what I suggested in post #12?

Tao_Man said:
what I have done is when the phone is close to charged but not fully is to wipe the battery cache, then connect it to charge. for the first few charges it will stay at 100% for some time before it starts to drop, an it will drop faster then it should and be out of power before it hits 1% but on the 3rd charge it always seems to calibrate itself. I do not drain it fully just till it is pretty low. To put in hard number fully charged it is about 4200mV and so I wipe the battery stats close to 4150 and charge when it gets around 3700
do this a few times and for me at least the battery seem to be pretty well calibrated.
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Click to collapse
Phon shouldn't be going all the way to 1% I believe. Battery internal safety should shut it off at around 5% to prevent a complete drain which will ruin the battery. If you are seeing 1%, that would lead me to think you are not calibrated properly.

CaelanT said:
Have you tried what I suggested in post #12?
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More or less.. for one, though, the battery calibration app should be doing the same thing as wiping the stats in cwm. And even still, my battery will never get to 100 no matter what, so I can't really wait til then to calibrate.. I've tried forcing earlier calibrations but to no avail
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Try charging with the phone off overnight, turning it on while still charging then calibrate. Hope this helps.
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BBock9 said:
Try charging with the phone off overnight, turning it on while still charging then calibrate. Hope this helps.
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Thanks, I'll try doing that. I think I'm gonna let it discharge almost all the way, then turn off and charge while that little battery icon is the only thing on the screen. I'll try wiping again at the end, and let you guys know.

Crazy battery reading

My battery was at 9%. I plugged it in, rebooted to recovery and it read 70%. I thought it was just a misread but when I rebooted it was still at 70%. Has anyone seen this before?
I'm running HB 0927, fast charge is off.
sent from the depths of helly bean

Mine acts that way, but usually just the opposite. Then over time it slowly goes up.

yeah im having a similar problem my phone battery will be at 88% then it will me at 60 in under 20 minutes which is very unusual

blizzardproof said:
yeah im having a similar problem my phone battery will be at 88% then it will me at 60 in under 20 minutes which is very unusual
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I've noticed that while in use the batt percent will drop a lot but then rise a few percent when you turn screen off.
sent from the depths of helly bean

Mine has done the opposite where it read 70 and dropped to 3% when I got into recovery. What's also odd about mine is that every time it says Charged, when I unplug it, it's never higher than 96%. But if I talk on the phone while it's plugged in, it will go as high as 99%.

That used to happen to me. I just plugged my phone in when it was dead, then I rebooted and I had 70%. Its actually very convenient. When I have to go somewhere, I just plug it in for a minute and my battery is all good to go.
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Lol it doesn't work that way, the phone might not read the battery percentage correctly, doesn't mean it can fully charge the battery in a few minutes. After you flash a rom or factory reset, it might take a bit of using the phone to get a precise battery reading.
Although some rom have the feature to enable fast charge, but it only improve charging by a bit.
Also its okay to not charge lithium ion batteries to 100% all the time, its actually better for the life of the battery to only charge up to high 90s, some roms have the feature to limit the charging percentage.

It's because now-a-days people don't know too much about the incorrect battery stats and how to fix them.
I've had the same problems, but it's quite weird, it goes up sometimes and down most of the time.
Charge to 100% - or as high as your phone gets - then wipe battery stats. Reboot a few times and charge again to 100% and then do it again.
There's a much better method laying around here, but i'm just too lazy to search right now.

Mine,does that also. I pull the battery out and it recorrects it
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Charging it solves the prob, but rebooting without just screws it up, especially when I had a camping retreat I couldnt call anyone causr of incorrect stats.
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