Develop Bugs

Correct way to recalibrate/wipe battery stats

Does anyone have a link for the thread that discussed the correct way to wipe battery stats when upgrading to a new Rom? I remember it went something like drain dead, charge to full, drain dead again then charge to full and wipe stats. I can't remember the complete process. Thanks for the help.
Sent from my PC36100 using XDA App

I've seen a couple different threads on that here, one saying discharge fully then charge while powered off, and the other saying to do a full charge "conditioning cycle". I did the latter and it seems to have made a difference.
Here's what I did:
Charge the phone fully with it powered on
When fully charged, disconnect cable
After green LED goes off, power the phone off
When phone is fully powered off, reconnect cable, amber charging light should be on
When LED goes green, disconnect cable
Repeat previous two steps 10 times
After 10th cycle, boot into recovery and wipe battery stats.
I am using Amon Ra recovery which has the wipe battery stats option under the Wipe option. I never did this when I had Clockwork recovery installed, so I don't know if the option is in the same place.
Being an electrical engineer, I find this business of battery conditioning interesting, along with the Ni-Cd "memory" vs. Li-Ion "no memory" issue. If anyone has found a decent physics-based explanation as to why these things do or do not have any basis in fact, I'd appreciate a link. Yes, I'm too lazy to Google it at the moment.

Hmm, I may have to look into this again. I charged my phone all night (powered off) and unplugged it this morning. I did nothing with it this morning but turn it on and look at it, then put it in standby (quick press of power button). It lost 16% of charge in less than 2 hours!
I'm running BS1.2 with the Baked1 (low voltage/best battery) kernel.
Damn, just installed System Panel and found that my CPU is at 100% constantly!

I'm trying this now. The longest I've pushed my battery was 22 hours... and that was with 39 minutes of screen on time, lol. In standby almost the entire 22 hours....

Ok, I believe my issue was related to a camcorder problem, my CPU usage has dropped back to normal levels after fixing that separate problem. After my battery recharges fully I will see what happens with the charge.

the other methods to do "calibrate your battery" (which isnt really calibrating the battery but the battery stats of the phone so it can accuratly judge when it stops and starts charging)
1) charge the phone to full
2) unplug and use phone till it shuts off from no battery (do not plug in until it shuts off)
3) charge phone to full again with out unplugging till 100% (check under about phone > battery it shoudl say full charge there)
this should reset the battery stats.
the last method is one from HTC
1)Charge the phone for 8 hours uninterupted with power on
2) turn off the phone and charge for an additional hour
3) turn ont he phone unplug it and let it sit for 2 minutes then plug it in for an additional hour.
all 3 methods listed should help. I personally dont like the x10 method because it has the potential and basically over charges the battery to make sure it is acctually at a full charge. It is much faster then the other 2 methods though so to each there own.

Dont waste your time on...
plug/unplug 10 times. It really doesn't recal the battery.
the unplug/plug 10 times.
1. Phone on...charge until green light comes on. Immediately unplug and turn phone off.
2. Plug phone back in until green light comes on again. Immediately boot into Recovery and wipe battery stats.
3. Use the phone on battery until dies.
4. recharge phone to 100%
You are good to go!

If I tether during the day (5+ hours) a lot, is it bad on my battery? Isn't that like a constant charge or does once the LED turn green it stops trying to charge?
Thanks.

fldash said:
If I tether during the day (5+ hours) a lot, is it bad on my battery? Isn't that like a constant charge or does once the LED turn green it stops trying to charge?
Thanks.
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the evo doesnt do a trickle charge so when the light turns green it stops, this is why you will almost always drop 1-5% battery rather quickly.

Are you sure? My light has been green for a while, and my phone battery status says 'Full'.

fldash said:
Are you sure? My light has been green for a while, and my phone battery status says 'Full'.
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There's a lot of confusion over how the battery / charging circuit works and how it reports. My advice is to just charge until it's green and full, then unplug it. If you leave it plugged in all night, unplug it for 10 mins in the morning, then plug it back in to top off.

That doesn't really help me SilverZero, my question is only if leaving it tethered (which means connected to USB) is bad for my battery.

Well on mine i would check it every once in awhile and i would see that once it get downs to under 90% that it would charge again till it recognized that it was full again. So based on that i dont think you should have to worry about it. It seems to only draw the charge when needed. I also leave mine plugged in alot when im home so its good to go when i leave and havent noticed a loss of battery life at all.

You guys don't want the charger to trickle charge. Li-Ion does not accept overcharge, even 0.01C (15 mA on the stock Evo battery) will cause it to vent and probably combust.

So does "calibrating the battery" calibrate the phone or the actual battery?
I ask because I have 3 spare batteries, wondering if I have to do this for each of them??? They are all standard size, one of them OEM

[Q] real guide to calibrate battery

Hello to all people.
I read all guides in this forum about battery calibration but nothing same to be correct for me!
I have leeDroid 2.2e ROM Oc up 1156mhz and smarttass governator.
The problem is that my battery drain too fast!after a complete night charge I turn on my phone and after 5minutes my battery goes down to 99 98 97 until 89 in an hour!the very strange problem is that I can see 100% only for very few minutes.
I have downloaded from market battery booster and I have noticed that if my voltage is 4192mv under charge with green led, when I unplug the phone from charge the battery drains less quickly.also i have noticed that after a night of charge my led is green and when I turn on it after one minute if I plug to ac my led remains orange for a lot of time!!!!that is very strange!!!
Can anyone help me?
sent from the future

I saw another post in a German forum to this topic and I made it like this, 'cause my Battery went directly to 89% after plugging off the cable: Load your battery with the phone turned on until the green LED light is on. Then plug it off, turn the phone off, plug it in and let the battery load until the LED is green again. Then plug it off, turn the phone on and let it boot completely. After that, turn it off again, plug the cable in and let the battery load until the LED is green. Then plug the cable off, turn your phone on and use it. The problem shouldn't be there anymore. But you should do this everytime you flash a new Rom!

Ok thanks man!but I don't see in any steep how to restore the battery stats via recovery
sent from the future

I believe the reason for the battery going straight to 89% is because when the battery is at 100% and its still on charge, every now and then, the phone discharges itself down to 90% and then back up to 100%. This is because trickle charging is generally considered bad. If you dont believe me, download Juice Plotter from the market. charge your phone up to 100% and leave it on charge overnight. When you check juice plotter in the morning you will see that every so often it drops to 90% and back up to 100%. Chances are that somepeople are taking thier phone off charge when the phone is in the middle of one of these dips. I know i do it all the time.

mattiadj said:
Ok thanks man!but I don't see in any steep how to restore the battery stats via recovery
sent from the future
Click to expand...
Click to collapse
You don't restore battery stats from recovery. You wipe battery stats!

alex101uk said:
every now and then, the phone discharges itself down to 90% and then back up to 100%.
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Click to collapse
Thanks for that info, I had been wondering about that myself.

StuMcBill said:
You don't restore battery stats from recovery. You wipe battery stats!
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Click to collapse
Yes it is what i want mean, sorry for mistake...so i don't need to wipe battery stats?

You don't have to but you can. In AmonRA go to "Wipe" and choose "Wipe Battery Stats". In Clockwork it is in Advanced, I think...Or in the Section where you can mount the drives...The Tip that I wrote is the Battery Calibration how you can find it on HTC's Homepage. If your Desire is rooted, you can just wipe the stats if you want to.

Moved to Q&A as not development.

Proper battery calibration?

At 90 percent my dhd turns green no matter how many times I wipe the battery stats it doesn't help also the mv of my battery stays at 4189 even when fully charged , anyone help ?
Sent from my Desire HD using XDA App

djamorpheus said:
At 90 percent my dhd turns green no matter how many times I wipe the battery stats
Click to expand...
Click to collapse
That's normal (with a lot of ROMs). It doesn't mean it's stopped charging, it should still charge to 100% it's just that 90% is the trigger. Nope, no idea why but rest assured there's nothing wrong.

Batteries don't last forever, they lose charge over time.
To calibrate charge up to max then go into CWM and delete battery info or delete the proper file and that's it.
If you want to make sure the calibration is done correctly then let the battery discharge fully and charge up to max again without a break.
Anyway that's what I have always done and works great for me.

I've never relied on the percentage of battery. I just used the Current Widget and stop charging when it shows 0mA. From my observation, that usually take about 1.5 hour after the led first change color.

ErOR22 said:
Batteries don't last forever, they lose charge over time.
To calibrate charge up to max then go into CWM and delete battery info or delete the proper file and that's it.
If you want to make sure the calibration is done correctly then let the battery discharge fully and charge up to max again without a break.
Anyway that's what I have always done and works great for me.
Click to expand...
Click to collapse
The more often recommended method is (via HTC & copied from sticky)
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
Now you can boot into recovery and wipe the stats.
I only suggest this as you have been woping the battery stats a lot and want to make sure all is ok. Although it is also good the first time you get the DHD.

I've done all the steps that everyone has mentioned I was just wondering about the led light going green at 90%
Sent from my Desire HD using XDA App

djamorpheus said:
I've done all the steps that everyone has mentioned I was just wondering about the led light going green at 90%
Sent from my Desire HD using XDA App
Click to expand...
Click to collapse
In case there's confusion, I wasn't offering advice to fix it, it's normal behaviour in this case, my advice was just to correct any possible bugs from all the battery resets you have done.

[Q] Desire turns off at 10%

Everytime my phone reaches 10%, the phone will shut down itself and it won't turn on again.
i have tried bump charging and calibrating the battery but still without success... anyone got any soulutions other then buying a new battery?
thanks.

Try this: fully charge the phone then let the battery drain completely, until the phone shuts down. Plug the phone into the wall charger, let it charge for a minute or so then turn the phone on while still plugged into the charger and let it charge completely. After a full (100%) charge, the battery indicator should be precise.
I've noticed that if i restart the phone of plug it in after charging, the battery indicator will show an extra 10%, so that's the main reason for the shutdown at or a little below 10%.
This operation should be repeated once a month, just to keep the battery and the battery stats fresh.
Don't wipe battery stats and don't try any other calibration tweaks. They might damage the battery. There are some people here complaining about that.
If the phone still shuts down at 10% after the above-indicated trick, then your battery might be old and in need of replacing, but i wouldn't replace it just because of a 10% indicator error if it can still hold a proper charge.

I have the same problem. I also calibrated my batterie and everything but it still turns off at ~10%.
But since I know that, it's not really a problem

Its always turned off at ~15% for me. I accepted that this was normal. I've seen a lot of posts around but no one seems to of found a proper solution. I actually doubt that there is a proper solution to this.
Punched in..

snq's kernel? I take it is normal with it as none of the GB sense rom managed to come even near the 1-2%. A bug with the kernel probably.
Flashed Oxygen last week - bam, phone turns off at 1%. No calibration was needed even .

Every time this happens to me I charge it 100% then I reset battery stats. Then let it discharge threw normal use then give it a proper charge, plugged into wall charger, not PC.....! And once its 100% ignore green light check it says 100% on the top bar then I unplug. Its normally always sorted then. But I have had to repeat twice in the past.
I also agree about kernal, often after updates it goes bonkers, and I'm on miui, lots of updates
Sent from my HTC Desire using XDA App

Mine also used to turn off at ~14%. After using a battery calibrator, i could push it down to 7%. However, on the other "side" of the scale, it goes down qute quickly from 100% to ~92%. All this on GV2.8, and the unofficial ManU kernel 2.1.1.
Sent from my HTC Desire using XDA App

Just wipe battery stats in recovery after full discharge if you changed ROM, and then let it charge to 100%.

Used the battery calibrator app (for nexus one) with detailed instructions. Now batt lifeis awesome, turns off at 3%.
Sent from my customized HTC Desire using TTP

This works great for my Desire, and it turns of at 1%
http://forum.xda-developers.com/showthread.php?t=1240494
Hope it helps!

I had the same issue on my stock Telstra branded rom. Since changing to cyanogenmod it hasn't happened since.
Sent from my CM7.1 Desire using XDA Premium App

darwin567 said:
This works great for my Desire, and it turns of at 1%
http://forum.xda-developers.com/showthread.php?t=1240494
Hope it helps!
Click to expand...
Click to collapse
Did the thread move or die, or is the link just wrong?

[HELP] Battery question

My wife has my old S2 and the past day has noticed it only charges to 52%.. She tends to play on the phone doing miscellaneous stuff thru the day and when it gets low just plugs the charger in and continues to play.. I know on my S3 everynight I allow it to get down to about 2% then will plug it on until it reaches full charge 100%.. Should I allow hers to fully discharge til the phone shuts off and let it get a full charge cycle the next couple days iin hopes of "re-training" the battery cycles or is there something else I should do.
Sent from my SGH-T999 using xda app-developers app

Lithium battery's don't have a "memory" like nickel cadmium batteries. They would die quick doing what your describing over time. Lithium doesn't work that way.
In other words, I wouldn't worry about it.
Sent from my SGH-T989 using xda app-developers app

HoustonsBirdman said:
My wife has my old S2 and the past day has noticed it only charges to 52%.. She tends to play on the phone doing miscellaneous stuff thru the day and when it gets low just plugs the charger in and continues to play.. I know on my S3 everynight I allow it to get down to about 2% then will plug it on until it reaches full charge 100%.. Should I allow hers to fully discharge til the phone shuts off and let it get a full charge cycle the next couple days iin hopes of "re-training" the battery cycles or is there something else I should do.
Sent from my SGH-T999 using xda app-developers app
Click to expand...
Click to collapse
Method 1 – The Drain Way
Drain it down until fully dead.
Charge normally to full.
Reboot to Clockwork recovery and wipe battery stats (under advanced, on second page), reboot phone.
Turn everything on, flashlight, Bluetooth, Wi-Fi, Pandora, the whole nine, to quickly drain it completely dead.
Charge normally to full.
Method 2 – The Powered Off Charge way
Charge your phone 100% while it’s on.
Unplug it from the charger, power off, then charge it up to 100% with it in a powered off state.
Unplug charger from phone. Power it on, and then charge it to 100% while the phone is on.
Unplug the charger and then reboot into Clockwork, go to advanced and clear the battery stats.
Power on, charge to full, and then enjoy.
Method 3 :
Start with the phone powered on.
(Phone on) Charge battery until the LED turns blue
(Phone on) Unplug the phone from the charger, wait until the LED turns off
Power off the phone.
(Phone off) Plug the adapter into the phone, charge it up until the LED turns blue
(Phone off) Unplug, wait until the LED turns off
Power the phone on.
Wait until the phone is booted back up all the way, and then power it off again
(Phone off) Plug the adapter into the phone, charge it up until the LED turns blue.
Boot the phone into recovery mode
Go to Advanced, and then choose Wipe Battery Stats.
Power the phone on and use normally.
You really dont have to reboot into recovery and wipe battery stats as that doesn't really work but to get all your juice back its going to be a few cycles also this works pretty good as well https://play.google.com/store/apps/details?id=com.nema.batterycalibration&hl=en