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.
Sent from my PC36100 using XDA App

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
Sent from my PC36100 using XDA App

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.
Sent from my PC36100 using XDA App
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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
Sent from my PC36100 using XDA App

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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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.
Sent from my PC36100 using Tapatalk

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

Serious Battery Issues

I have a dft desire nand running with magldr. Im having serious battery drainage. I let it die. Charged it. Let it die again and then charged it again. Even then the battery life is only around 3 hours and its down to 5%. I use it but the only things I use is facebook, xda and aim.
Any suggestions?
Sent from my HTC HD2 using XDA App

eyeisdasteve said:
I have a dft desire nand running with magldr. Im having serious battery drainage. I let it die. Charged it. Let it die again and then charged it again. Even then the battery life is only around 3 hours and its down to 5%. I use it but the only things I use is facebook, xda and aim.
Any suggestions?
Sent from my HTC HD2 using XDA App
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Click to collapse
1. Try other builds.
2. How old odd your battery? Genuine?
3. Search and read up on this topic.

I decided to try setcpu. Which I downloaded here. Its helping some. Its been about an hour and its gone down like 5%. So thats atleast a little better. Im gonna mess with the settings and find something I like. Im do some more research too.
Sent from my HTC HD2 using XDA App

Have you tried turning off
Settings>Display>Auto-Rotate,Autobrightness
Settings>Location&Security>Use Wireless Network and Use GPS satellites
Settings>Accounts&Sync settings>Background Data and Auto-Sync
Settings>Mobile Networks> Data Enabled and instead of having 3G on set it for 2G
When I do this I can get a whole days use out of my phone and only turn them on when needed. Try that out and see if it helps bro

I didnt realize some of those were still on. I was pretty sure I shut almost all of those off but your post made me go check. Haha. Guess not. Thanks man.
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eyeisdasteve said:
I didnt realize some of those were still on. I was pretty sure I shut almost all of those off but your post made me go check. Haha. Guess not. Thanks man.
Sent from my HTC HD2 using XDA App
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Try other builds or you can also install Current Widget from market and view your mA useage, enable log and then you can keep an eye on it and see what the minimum useage is. It should be around 1-5 in standby, if not then you have something running that is eating up battery.
If it is at 1-5 mA and you still have battery drain then it could be your battery on the fritz.
Problem is that allot of people tend to stick them on charge before they are drained properly or also do not let it charge fully. Some battery type's have a sort of memory and if you dont charge/discharge properly it can affrect overall battery life.
There is MANY thrteads on battery issues but really this shouldnt be an issue anymore as majority of ropms have great battery life. Also remember that Android is a battery hog even on native devices.
So check out some threads and try some solutions.

eyeisdasteve said:
I have a dft desire nand running with magldr. Im having serious battery drainage. I let it die. Charged it. Let it die again and then charged it again. Even then the battery life is only around 3 hours and its down to 5%. I use it but the only things I use is facebook, xda and aim.
Any suggestions?
Sent from my HTC HD2 using XDA App
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Click to collapse
Please don't let your battery discharge completely. If it does you will ruin the battery.

dkl_uk said:
Please don't let your battery discharge completely. If it does you will ruin the battery.
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this is not true mate not true at all, ive let my battery discharge completely a few times and it's still in perfect condition.

jonny68 said:
this is not true mate not true at all, ive let my battery discharge completely a few times and it's still in perfect condition.
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I don't doubt that at all after a 'few times'.
However, since I can't be arsed typing out my own explanation, how about I paste you one from the experts.
"Avoid completely discharging lithium-ion batteries
If a lithium-ion battery is discharged below 2.5 volts per cell, a safety circuit built into the battery opens and the battery appears to be dead. The original charger will be of no use. Only battery analyzers with the boost function have a chance of recharging the battery.
Also, for safety reasons, do not recharge deeply discharged lithium-ion batteries if they have been stored in that condition for several months."
Also:
"Unlike NiCad batteries, lithium-ion batteries do not have a charge memory. That means deep-discharge cycles are not required. In fact, it’s better for the battery to use partial-discharge cycles.
There is one exception. Battery experts suggest that after 30 charges, you should allow lithium-ion batteries to almost completely discharge. Continuous partial discharges create a condition called digital memory, decreasing the accuracy of the device’s power gauge. So let the battery discharge to the cut-off point and then recharge. The power gauge will be recalibrated."
So as long as you were hitting the 30-charge-and-dump schedule, you'll be ok.

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.
Sent from my SPH-D700 using XDA App

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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Click to collapse
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.
Sent from my SPH-D700 using XDA App

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.
Sent from my SPH-D700 using XDA App
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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.
Sent from my SPH-D700 using Tapatalk

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.
Sent from my SPH-D700 using XDA App

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.

[HELP] Big battery drain. 1 hour battery life

Ok I lied, it's not one hour backup, it's 50 min battery backup. I charged my phone to 100% 4163mv and played about 2 songs, battery dropped to 47 and then suddenly 0%. It all happened in less than 50 min. Just when I was thinking, it can't be more worse. I charged and battery was 99% :O. Another time, phone shut down at 40%, when charged moved up to 70% and number started increasing every 3 seconds. I did calibrated it many times so that's out of question. I bought this phone in May so I will be surprised if battery is defective. I'm confused. Please help!!
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friend863 said:
Ok I lied, it's not one hour backup, it's 50 min battery backup. I charged my phone to 100% 4163mv and played about 2 songs, battery dropped to 47 and then suddenly 0%. It all happened in less than 50 min. Just when I was thinking, it can't be more worse. I charged and battery was 99% :O. Another time, phone shut down at 40%, when charged moved up to 70% and number started increasing every 3 seconds. I did calibrated it many times so that's out of question. I bought this phone in May so I will be surprised if battery is defective. I'm confused. Please help!!
Sent from my GT-I5800 using xda premium
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Click to collapse
charge till you get"unplug your charger " message

I did, many times too.
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friend863 said:
I did, many times too.
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Time for a new battery bro...
Same thing happened with me....
On a side note : Does the back cover of your phone fit?
Cause when I had this problem my battery had literally expanded in size.... :X
Due to which the back cover did not fit perfectly.......

Yeah, it fits perfectly..
Sent from my GT-I5800 using xda premium

Download from market app called Battery Calibration.
Open it and connect your phone to the charger. When you have 100% status, and ~4200mV click Calibrate and unplug your charger.
Then set the LCD Brightness to max, set timeout to never sleep or just use your phone to fast discharge it(that doesn't need to be fast and doesn't need to be slow it just need drop to 0%).
Let it automatically die because of low power, and then charge it to 100%(you can use battery calibration app to see the voltage, around 4.2V it's max).
After that your phone should have a much better battery life.

JoHnNy08PL said:
Download from market app called Battery Calibration.
Open it and connect your phone to the charger. When you have 100% status, and ~4200mV click Calibrate and unplug your charger.
Then set the LCD Brightness to max, set timeout to never sleep or just use your phone to fast discharge it(that doesn't need to be fast and doesn't need to be slow it just need drop to 0%).
Let it automatically die because of low power, and then charge it to 100%(you can use battery calibration app to see the voltage, around 4.2V it's max).
After that your phone should have a much better battery life.
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Click to collapse
He already said, he did calibrate the battery....
I 100% think you need a new battery Mate....

Try installing any stock rom before. Maybe that can help. I was getting ultra fast battery drains when I flashed indroid 5.0
Sent from my GT-I5800 using xda premium

Yes u need a change of batt. I had not even up to half an hour of wifi surfing. After changing i could use the phone for 30+hrs
Sent from my i9003 powered by Poseidon's Rom + UC kernel

Change the Battery.. I had the same problem.. then found out my battery got swollen big time..

[Q] Will the Defy finally work with 3500mAh batteries?

With new kernels and Android 4.3, is the Defy finally correctly recognizing bigger batteries with their real mAh? I want to buy a 3500mAh one, but need to know if it works upfront

It is theoretically able to recognise higher capacities thanks to a patch by quarx. But often such batteries are not as advertised.
Sent from my MB526 using xda app-developers app

Is this patch integrated in his CM10 (or CM10.2)?

Is it? If not, where do I find it?

It is integrated in all his 2ndboot ROMs.
Sent from my MB526 using xda app-developers app

I have a 3700mAh battery now, but it doesnt charge above 89%. I am on CM10 18/9.
Do I have to reset my battery stats?

I have a 3700mAh battery now, but it doesnt charge above 89%. I am on CM10 18/9.
Do I have to reset my battery stats?

Quza said:
I have a 3700mAh battery now, but it doesnt charge above 89%. I am on CM10 18/9.
Do I have to reset my battery stats?
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Click to collapse
No, try calibrating it. If it still doesn't work, then i guess your battery is not as advertised.

The battery is on 1% for over 2,5hours now. With active display. wtf 3560mV according to battery monitor widget.
/edit: 5hours 15minutes. display brightness 100%, stability test for the last 1,5 hours. The 1percent is holding position.