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.
Click to expand...
Click to collapse
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'.
Click to expand...
Click to collapse
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] Phone will only charge with power off ?????

When the power is on the TP2 the red LED charge light is on. the icon in the task bar changes to show that it is plugged in. but after sitting for hours the battery only drains further. If i power the TP2 down plug it up the red LED comes on and the battery charges fully to 100% then goes to green. I have bought new battery and charger. any ideas? note it is allowed to charge via usb in the settings. thanks folks

This is NOT a issue. It's a feature.
Phone does charge to 100%, but later the electricity is cut off until it reaches ~95% (or something like that). It prevents the battery from overcharging and saves important battery lifetime cycles. If it would be charged constantly from 99% to 100% the battery would be dead in a month.

[Q] Almost new battery only charging up to 92%

I had my new HTC Desire 3 weeks ago. Those last days I plug my HTC to the charger overnight and when I take it back in the morning the battery is only up to 92-93% and the led is green, like it had a full charge. If I unplug-plug the device, it will resume charging, this time up to 100%.
Is this a normal behaviour for a battery 3 weeks old?
How can I fix this?

This is normal behavior of the phone. It charges up to 100% and then stops until the charge drops down to 90%, at that point it starts charging again up to 100%. This is what you have noticed, there is nothing wrong with your phone or the battery

This worked, even though I am no longer worried about it.
1) After green light unplug phone and wait 10 minutes
2) Shut phone off
3) Plug back in till light green
4) Turn back on
Poof, 100% but other than that the above post is correct, not a problem. I bought an extended battery for mine. 3,000 mAh and have no problems.

[Q] Phone Charging Question

Problem:
I have been reading as many posts as possible but I haven't come across my exact situation. I apologize if this is posted elsewhere.
I am running a rooted Dinc using CyanogenMod 7.0.3. If I charge the phone while it's powered on, the amber led turns green as soon as the battery indicator hits 100%. However, recently I've noticed that if the battery is close to being full, say 90%, and i power it off to charge it, it actually takes longer for the amber led to turn green. It might take 20-30 minutes longer.
I've also noticed the amber light turn green when the indicator only showed 92%. In trying something different I also noticed that if I charge the phone while it's powered on, then turn the phone off, the led goes amber and takes another 20 minutes to turn green again (I might be accidentally bump charging in this example but I'm not sure).
Attempted Solution:
I've read that a battery recalibration might help. I tried one method that requires the battery to be pulled after a full charge, but my phone won't boot while plugged into the wall if there's no battery. Then I tried booting into recovery, where I found an option to reset the battery stats... which I just did about 5 minutes ago.
I'm going to see how things go tomorrow, but is this normal? Has anyone else experienced these things? Thanks.

Logan176 said:
Problem:
I have been reading as many posts as possible but I haven't come across my exact situation. I apologize if this is posted elsewhere.
I am running a rooted Dinc using CyanogenMod 7.0.3. If I charge the phone while it's powered on, the amber led turns green as soon as the battery indicator hits 100%. However, recently I've noticed that if the battery is close to being full, say 90%, and i power it off to charge it, it actually takes longer for the amber led to turn green. It might take 20-30 minutes longer.
I've also noticed the amber light turn green when the indicator only showed 92%. In trying something different I also noticed that if I charge the phone while it's powered on, then turn the phone off, the led goes amber and takes another 20 minutes to turn green again (I might be accidentally bump charging in this example but I'm not sure).
Attempted Solution:
I've read that a battery recalibration might help. I tried one method that requires the battery to be pulled after a full charge, but my phone won't boot while plugged into the wall if there's no battery. Then I tried booting into recovery, where I found an option to reset the battery stats... which I just did about 5 minutes ago.
I'm going to see how things go tomorrow, but is this normal? Has anyone else experienced these things? Thanks.
Click to expand...
Click to collapse
The kernel and the hardware charge it in different ways. That's why there are differences. DInc is famous for ending charging before the battery reads full. There's already a thread on that. there's not much point in getting hung up on how that thing charges. Be glad yours isn't like mine; a battery that discharges faster than it charges. Seriously.

loonatik78 said:
The kernel and the hardware charge it in different ways. That's why there are differences. DInc is famous for ending charging before the battery reads full. There's already a thread on that. there's not much point in getting hung up on how that thing charges. Be glad yours isn't like mine; a battery that discharges faster than it charges. Seriously.
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Click to collapse
Before I had a fast charge kernel (thanks Chad!) Using GPS with the stock VZW car charger, my battery would go down while it was on the charger!
Sent from my ADR6300 using XDA App

On AOSP roms, the LED will turn green at 90% and charge slower from 90%-100%. Perfectly normal, and I think on any rom it will charge slowly from 90%-100% to protect the battery.
The battery will charge further when you turn the phone off, what you described is what's known as bump charging. If you do this, you should notice a slower drop from 100%-90% than usual, because the battery is charged to a "true" 100%. When the phone is on and charging (above 90%), it simply keeps the battery above 90% even if it says it's fully charged, and this is why the inc is notorious for the quick 100%-90% drop.

If you do a bump charge and then clear the battery stats and use the battery calibration app will you need to bump charge again or will it know what the true 100% capacity is and keep the droid lasting longer. Not noticing much of a diffrence when i went from 1300 battery to a 1500. May get a bigger batter that'll fit the stock battery door cause I'm trying to get the best battery life i can get.

Thanks guys, I appreciate the help. I think something else that has thrown me off is that before I rooted the phone I wasn't able to see the actual battery percentage in numbers... all I could see was the battery icon. Things are now making more sense.
After recalibrating my battery I bump charged the other day and I was able to get almost 2 days out of my phone on light usage. Without bumping, I was able to end my day yesterday at 50% under my normal usage. Which is a noticeable improvement. Normally I end the day with about 10-20%. The big test will be once I go back to work next week. The cell reception is real spotty in my classroom, which I know makes the cell radio work harder.
Thanks again.

I found a lot of answers I was having about battery charging in this thread:
Your battery gauge is lying to you (and it's not such a bad thing)

[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