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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
I noticed something about the battery meter.
If you power on your phone when the charger is plugged in, the battery meter shows a higher value.
If you power on your phone when no charger is connected, the battery meter shows a lower value.
And these values stay for as long as your phone is not rebooted. My guess is, the value without charger plugged in (lower value) is more accurate.
So, if you want to make your battery meter more accurate, try this:
- Disconnect your phone from the charger
- Power off the phone
- Power on the phone again (phone must be disconnected from charger)
- After phone has booted into Android, plug the phone into USB/charger to charge it again
If you could try this out and see if the observation is always true, then maybe we should make this procedure standard to get a more accurate battery meter reading.
So this may have caused the fact that my phone keeps telling me, while charging, the battery is fully charged however it says 95% as soons as its unplugged
Power off the phone and connect charger while it's off, wait for the 100% sign on the fully green battery, then unplug the cord and connect it again, you can do this a couple of times. And resetting the battery stats should also help in some way.
opica said:
Power off the phone and connect charger while it's off, wait for the 100% sign on the fully green battery, then unplug the cord and connect it again, you can do this a couple of times. And resetting the battery stats should also help in some way.
Click to expand...
Click to collapse
What I'm suggesting is a bit different.
Power off phone.
Power on phone again, without plugging anything in.
After phone has booted, plug in charger.
EDIT: I notice this difference in battery meter reading tends to happen only with the *real* charger, and not when connect to a USB port on a PC.
That is right hardcore. This also refers to post-flashing boot.
I always disconnect device as soon as flashing procedure completes.
hardcore said:
I noticed something about the battery meter.
If you power on your phone when the USB charger/cable is plugged in, the battery meter shows a higher value.
If you power on your phone when no USB charger/cable is connected, the battery meter shows a lower value.
And these values stay for as long as your phone is not rebooted. My guess is, the value without USB plugged in (lower value) is more accurate.
Click to expand...
Click to collapse
Hey,
Heres whats happening:
Lithium-ion batteries dont like it when you charge them while full. It wears them down. So to preserve batterylife it charges untill full, then stops charging completely. When it droppes down to far, it'll charge again for a bit. The phone will show full, in reality it'll be a little less. When you unplug it will drop down quickly to a more precise value. Bump-charging (disconnect, reconnect charger) works, however you are wearing the batterylife down. Could be you dont care, so it'll be youre own choice.
Older phones do not do this. They charge till full, then trickle power continuesly so it'll always be full when disconnected.
Hope this helps.
weirder said:
Hey,
Heres whats happening:
Lithium-ion batteries dont like it when you charge them while full. It wears them down. So to preserve batterylife it charges untill full, then stops charging completely. When it droppes down to far, it'll charge again for a bit. The phone will show full, in reality it'll be a little less. When you unplug it will drop down quickly to a more precise value. Bump-charging (disconnect, reconnect charger) works, however you are wearing the batterylife down. Could be you dont care, so it'll be youre own choice.
Older phones do not do this. They charge till full, then trickle power continuesly so it'll always be full when disconnected.
Hope this helps.
Click to expand...
Click to collapse
I'm not talking about the usual Li-ion full-charge effects. Also it may not be true that other phones don't do this. For sure, many laptops do this - after the battery charges to 100%, they won't charge the battery until it decreases to a certain level, say 95%.
I'm referring to the difference in battery meter reading if u boot the phone while connected to the wall charger, vs booting the phone when it's disconnected from the charger.
What you say is right, I am used to power OFF my phone & charge it at night, & when I get up, switch it ON while still plugged in. I must make it a point to remove the cable before I switch ON.
I noticed this many months ago and it persists even after flashing many different firmwares. It actually comes in handy some times. For instance when my battery is running low and i need to step out i simply plug in the charger, power off then power back on. Phone instantly jumps 30% or so. But generally i tend to power on without the charger attached so as not to stuff up the battery stats.
Sent from my GT-I9000 using XDA App
Anyway this behavior is not correct.
Samsung changed recently battery drivers in JPX sources and the problem is still persistent. I suspect it might be related to wrong battery voltage measuring point (hardware design flaw? although most problems with sgs are/were software related) or result misinterpretation.
Or their Q/A team is so clueless that they didnt notice that.
hardcore said:
EDIT: I notice this difference in battery meter reading tends to happen only with the *real* charger, and not when connect to a USB port on a PC.
Click to expand...
Click to collapse
I just tested this. 5% battery. Reboot with usb plugged in. 50%battery. The battery also seems to drain really fast after the reboot.
I am plugged in using original usb cable in a usb on the front panel of my pc...
Edit: im still plugged in and it's going down... i boot with usb at 50% leave it in and while charging the battery goes down... i left it in and now it's going 49...48...47 while charging... wtf lol
Sent from my GT-I9000 using XDA App
Lightarrow said:
I just tested this. 5% battery. Reboot with usb plugged in. 50%battery. The battery also seems to drain really fast after the reboot.
I am plugged in using original usb cable in a usb on the front panel of my pc...
Edit: im still plugged in and it's going down... i boot with usb at 50% leave it in and while charging the battery goes down... i left it in and now it's going 49...48...47 while charging... wtf lol
Sent from my GT-I9000 using XDA App
Click to expand...
Click to collapse
My guess is this is because the actual level of the battery is 5%, and 'cause it's plugged in it's saying 50% for some strange reason. So really you're charging from 5% up to 50% (and eventually more, but that aside), and I think the phone is averaging between your actual battery level and the 50% every time you go up 1%? Just my guess.
johanaikema said:
My guess is this is because the actual level of the battery is 5%, and cause it's plugged in it's saying 50% for some strange reason. So really you're charging from 5% up to 50% (and eventually more, but that aside), and I think the phone is averaging between you're actual battery level and the 50% every time you go up 1%? Just my guess.
Click to expand...
Click to collapse
Yeay that is what im thinking too weird stuff.
@hardcore : just tried your suggestion. I shut down with the cable plugged in. Remove it. Reboot. But my battery is still at 47... ill try to go into cwm to see if that triggers something. Or maybe remove the battery and insert it again...
Sent from my GT-I9000 using XDA App
Ok. I tried this : removed my battery, waited 5 seconds, reput my battery, reboot all with charger unplugged. Battery went from 47 to 52. So this had no effect.
Then i shut down the phone, used 3br to get into recovery (cwm) did nothing except select reboot phone now and the phone rebooted, now 12% battery.
Btw using all tweaks in your kernel except tun.
Weird stuff...
Sent from my GT-I9000 using XDA App
noticed this months back too but didnt think much about it.
i just figured the software is reading the higher voltage during charge and reporting it wrong during boot.
*could be wrong
EDIT: and the diff is quite big, increase of 20-30%
hardcore said:
What I'm suggesting is a bit different.
Power off phone.
Power on phone again, without plugging anything in.
After phone has booted, plug in charger.
EDIT: I notice this difference in battery meter reading tends to happen only with the *real* charger, and not when connect to a USB port on a PC.
Click to expand...
Click to collapse
what @weirder post is the true fact about the lithium ion charge process. your charging method is called bump charging. but that way of charging the juice wear off the battery life sooner than normal charging..
I've been checking out the battery meter source code, and I think the battery level is calculated *only* from the battery voltage. Which is quite inaccurate, compared to laptop batteries which keep track of the charge, etc.
hardcore said:
I've been checking out the battery meter source code, and I think the battery level is calculated *only* from the battery voltage. Which is quite inaccurate, compared to laptop batteries which keep track of the charge, etc.
Click to expand...
Click to collapse
This could be improved by using its temperature. Since the SoC is a function of temperature, charge history, and current evolution over the time.
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I tried the bump charging till the meter says 100% and right after unplugging from the charger the meter reads 98%. I let the battery drain up to 96% and connected my phone into a usb port of my PC and when the meter say its 100% charged, i disconnected the phone from the usb port and wallah...it stays at 100% charged and it has been at 100% even after 15 minutes...
I really don't recommend bump charging. You risk damaging your battery by overcharging. Or worse, making it blow up due to overcharging! I know it sounds paranoid but you never know...
ok so i got a problem with my battery
my battery on my phone just going out to fast
for example today
i connected it so it could reload and then
when i disconnected it was 100%
then after 2 hours only that i havnt use the phone i mean havnt touched it even once
i look again on battery life and here it says 36%
and it keep going every day
can some1 tell me why it keep happening???
WOW! That's a major drain in 2hours.
My 2 cents are on a defective battery - since the phone was on standby.
You can try some tutorials on adjusting the power saving settings (like screen brithgness what to turn off and not etc.)
Also you might try caibrate the battery.
there is a thing like u charge it to 100% ,unplug from the charger and turn the phone off ,then plug in again and charge to 100% again... there is a thread about it on this forum, do a lil search it might help u
Dial *#*#4636#*#* and go to battery and find partial wake usage, here the apps are listed that prevent the phone form sleeping and thus causing battery drain. Also check the % under Settings-about phone- battery usage to see what app or process consumed the most battery.
Does it get very hot? I mean - if the battery really contains 1500mAh (which I doubt in this case) and drains completely in 3 hours, that's 500mAh, so 3.5V*0,5A=1,75W continuesly.
You really should notice that while it's in your pocket...
no the phone isnt getting hot
i mean it can sit on my pocket for like 2-3 hours and then it suddenly 3x %
without even touching it
Try these steps:
1. 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.
2. Disconnect the phone from the charger, and power it off.
3. Reconnect the phone to the charger with the phone powered off, and allow the phone to charge until the notification LED is green.
4. 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.
5. Disconnect the phone, power it on (OPTIONAL: Enter Recovery at this point and Wipe Battery Stats (from Advanced menu), and use it. You need to use this sequence only once.
If that does not solve it you have a defective batterie.
ok i will try it
but can u tell me what the point???
i mean what does it do??
NoneSkillZ said:
ok i will try it
but can u tell me what the point???
i mean what does it do??
Click to expand...
Click to collapse
The point of that, is to make the battery life longer. And actually it works. I tried when i bought my phone an the increase was significant!
Edit: Just saw in another thread that some newer custom ROMs has some things messed up, and they eat the battery more than normal when the screen is off. You might take a look at it.
yea i did all the steps and its not working
the battery still going down rapidly
so i should buy new one??
Yeah.
BTW, are you on a stock rom?
srry
no idea what stock rom means
but im on miui rom
Hello, i have some troubles with battery, i think it is fault of battery stats got messed up and the tab thinks it's at 100% charge while it's not. When battery goes to about 20% i plug tab and it charge normally bul slow to 50~60% and then after couple of seconds it goes from 50~60% to 100% and stop charging, when i enter in recovery mode i see 20~30% battery and after reboot battery shows 50~60% again. When i plug it again it start charging normally but after it charge about 10~20% it again get some issue and shows 100% and i got to reboot tab and charge again. How to fix this issue?
Even after charging my One M8 all night when I unplug the charger, it will shut down within 10 seconds unless I connect my external battery pack in time. When I reconnect a charging supply (mains or battery pack) it will show the green battery charging image and usually around 95% charged. So it seems to recognise the charge, but the phone doesn't think it's enough to keep operating so shuts down.
Background:
I was on Sense but I flashed to GPE using the RUU.
In the last couple of months I'd had my battery pack connected a lot (Pokemon Go!) as the phone was shutting down at 20%, so I was keeping it connected to the battery pack a lot.
Is there anything I can do 'fix' the battery or would I be better off trying to install a new one?
Thanks
HTC M8 Shutting Down With 100% Battery SHowing
My phone does exactly the same thing. All the 'fixes' listed to date don't make a difference. I've noted a factory reset doesn't do it either. Has anyone found a reliable fix or is it time to trash this phone?