Related
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
Hey guys, I rooted and installed mikfroyo 4.2 on my evo. I read a bit and thought I had to use recovery to wipe battery data. I did this and since then I have noticed that the battery usage/percent is off.
Ex: 100-90% goes very quickly, then 80% takes much longer.
I just plugged it into my charger at 29% and about 5 mins later its saying 56%.
The battery lasts long enough so I figure the battery is good.
What should I do aside from wiping the battery data? Do I have to calibrate it somehow?
Thanks
Sent from my PC36100 using XDA App
100% - 90% drop off is normal. Should normalize after 80%. There are some battery tricks n tips to charging if you look around. Pretty much consists of charging to full then turning off and charging some more then turn on, turn off and charge some more.
There are hundreds, if not thousands, of posts on this subject. The issue is battery longevity. When the battery reaches 100%, it stops charging (to reduce heat and increase battery life span). It only starts charging again after the battery drops below 90%. So your 100% display is lying to you.
There is a custom kernel that continues to charge the battery at a lower rate once it reaches 100%. You can find it here...
http://forum.xda-developers.com/showthread.php?t=876590
I'm using it with the Evo-NonSense ROM and it's amazing how much better battery life is. I've had the battery meter read 100% for close to an hour after unplugging.
I suppose it's possible I may have to replace the battery sooner due to using this kernel, but that's a price I'm willing to pay.
BR
The 100% > 90% is due to the kernel not allowing a trickle charge. Meaning once your phone hits 100% it switches to battery. It doesn't start charging again till it hits 90% or so. So when you unplug your phone, even if it says 100%, it is actually at 90%.
There are kernels that enable trickle charge but there is a debate going around as to whether or not it damages the phone.
sekigah84 said:
The 100% > 90% is due to the kernel not allowing a trickle charge. Meaning once your phone hits 100% it switches to battery. It doesn't start charging again till it hits 90% or so. So when you unplug your phone, even if it says 100%, it is actually at 90%.
There are kernels that enable trickle charge but there is a debate going around as to whether or not it damages the phone.
Click to expand...
Click to collapse
It could be anywhere from 100% - 90% not definately gonna be 90%
A drop of Chuck Norris's semen was placed on the IPhone. We now have the Htc Evo.
Crossrocker said:
It could be anywhere from 100% - 90% not definately gonna be 90%
Click to expand...
Click to collapse
I've been really confused lately because the meter says 100% when plugged in but the moment I unplug it in the A.M. it cuts over to 92%-96%... this makes sense now.
Hi fellas..
Maybe you've noticed the messages I've sent to Unofficial BravoS thread of Coolexe's (http://forum.xda-developers.com/showthread.php?t=1200517&page=51) which is the ROM I use.
The issue is, the battery discharges rapidly. Actually, if you check mV values, it doesn't discharge rapidly, but if you look at percentages, there is a huge inconsistency. I used Battery Monitor Widget to log the battery performances last night, and saw these horrible results:
Code:
2011/09/19|04:59:49|-515mA|37%|3581mV|40.2ºC|1|0
2011/09/19|05:00:51|-465mA|36%|3576mV|40.2ºC|1|0
2011/09/19|05:01:49|-460mA|36%|3576mV|40.2ºC|1|0
2011/09/19|05:02:50|-462mA|35%|3517mV|40.2ºC|1|0
2011/09/19|05:03:49|-477mA|35%|3517mV|40.2ºC|1|0
2011/09/19|05:04:50|-471mA|34%|3449mV|40.3ºC|1|0
2011/09/19|05:06:06|-478mA|0%|3415mV|40.5ºC|1|0
2011/09/19|05:06:08|-478mA|0%|3415mV|40.5ºC|1|0
These are the last lines of the log, before the phone shuts down. As you can see, the phone gone to 0% from 34% in one minute! No low battery warnings or whatsoever..
Funny thing is, this doesn't happen in StarBurst ROM (which is a Froyo based one). Do you reckon this is a GingerBread issue or something? I saw some other people complaining about their phone shutting down at 20% as well.
So, what do you suggest?
when you look at the voltage there isnt that much drain, so its only a displaying problem
wipe battery stats and maybe recalibrate the battery
but first one should fix it
cheers
ps: i just checked, my desire is at 18% with 3.693mV, now you see the differance
crendot said:
when you look at the voltage there isnt that much drain, so its only a displaying problem
wipe battery stats and maybe recalibrate the battery
but first one should fix it
cheers
ps: i just checked, my desire is at 18% with 3.693mV, now you see the differance
Click to expand...
Click to collapse
This is what I've done so far:
Drained battery to 0% (log above) and charged it a little bit while powered off (like 20%). Turned on the phone, and obtained those logs (last lines only):
Code:
2011/09/19|14:41:25|-268mA|10%|3644mV|38.1ºC|1|0
2011/09/19|14:42:25|-267mA|10%|3644mV|38.1ºC|1|0
2011/09/19|14:43:25|-270mA|10%|3644mV|38.1ºC|1|0
2011/09/19|14:44:25|-269mA|9%|3644mV|38.1ºC|1|0
2011/09/19|14:45:25|-267mA|9%|3644mV|38.1ºC|1|0
2011/09/19|14:46:25|-268mA|9%|3644mV|38.1ºC|1|0
2011/09/19|14:47:25|-266mA|8%|3644mV|38.1ºC|1|0
2011/09/19|14:48:25|-267mA|8%|3644mV|38.1ºC|1|0
2011/09/19|14:49:25|-269mA|7%|3640mV|38.0ºC|1|0
2011/09/19|14:50:25|-267mA|7%|3640mV|38.0ºC|1|0
2011/09/19|14:51:25|-266mA|7%|3640mV|38.0ºC|1|0
2011/09/19|14:52:25|-267mA|7%|3640mV|38.0ºC|1|0
2011/09/19|14:53:25|-267mA|6%|3640mV|38.0ºC|1|0
2011/09/19|14:54:25|-267mA|6%|3640mV|38.0ºC|1|0
2011/09/19|14:55:25|-267mA|5%|3635mV|38.0ºC|1|0
2011/09/19|14:56:25|-266mA|5%|3635mV|38.0ºC|1|0
2011/09/19|14:57:25|-267mA|5%|3635mV|38.0ºC|1|0
2011/09/19|14:58:25|-268mA|5%|3635mV|38.0ºC|1|0
2011/09/19|14:59:25|-268mA|4%|3630mV|38.0ºC|1|0
2011/09/19|15:00:25|-319mA|4%|3630mV|38.0ºC|1|0
2011/09/19|15:01:25|-268mA|4%|3630mV|38.0ºC|1|0
2011/09/19|15:02:25|-270mA|3%|3610mV|38.1ºC|1|0
2011/09/19|15:03:25|-269mA|3%|3610mV|38.1ºC|1|0
2011/09/19|15:04:25|-270mA|2%|3586mV|38.1ºC|1|0
2011/09/19|15:05:25|-273mA|2%|3586mV|38.1ºC|1|0
2011/09/19|15:06:25|-273mA|2%|3586mV|38.1ºC|1|0
2011/09/19|15:07:25|-273mA|2%|3586mV|38.1ºC|1|0
2011/09/19|15:08:25|-289mA|1%|3513mV|38.3ºC|1|0
2011/09/19|15:09:25|-290mA|1%|3513mV|38.3ºC|1|0
2011/09/19|15:09:51|-290mA|0%|3464mV|38.3ºC|1|0
It seems more "smooth" discharge now. Right now, I'm charging my phone off; going to turn on phone once it reaches "green light" with charger on, and plug it off once phone booted. Maybe then, it can know what's maximum and minimum.
So far, I tried to charge my phone to full and erase batterystats.bin but, as you can see at the first post, it didn't work well.. On the other hand, the phone charged-discharged only once in this ROM, you think it could be better if I've given a "second chance"?
i dont know much about that "battery calibrating" and reseting stuff, you have to search in the forum
only thing i want to say is, dont do that deep drains!
recharge at least 5%! you kill your battery, lithium-ion batterys get serious damage from deep drains
crendot said:
i dont know much about that "battery calibrating" and reseting stuff, you have to search in the forum
only thing i want to say is, dont do that deep drains!
recharge at least 5%! you kill your battery, lithium-ion batterys get serious damage from deep drains
Click to expand...
Click to collapse
I know, but when phone thinks it's 30% and not warn me, how can I do it?
In order to calibrate the battery meter - FYI the battery itself cannot be calibrated, as Li-Ion batteries have a very low memory compared to old Ni-Cd etc. batteries - you have to go through the following procedure:
1) charge the battery to 100%;
2) let the battery discharge until the phone shuts itself down;
3) plug the wall charger into the phone, boot the phone up then charge the battery to 100% without interruptions.
If the above procedure does not yield the expected results, you can try fully charging the phone (LED showing green) with it completely turned off (after completely draining it). Again, the charging procedure should not be interrupted.
Source: personal experience - had to do this twice after installing new ROMs, as the phone was shutting down at ~14% (working like a charm now).
Regarding the matter of battery wear because of complete discharges, Li-Ion batteries do indeed have a lower cycle count than old-school batteries, but the standard charge/discharge number a Li-Ion battery can take is ~350, so you can't damage the battery pack by doing a full cycle per month (required to keep the battery meter accurate).
Good luck!
TVTV said:
In order to calibrate the battery meter - FYI the battery itself cannot be calibrated, as Li-Ion batteries have a very low memory compared to old Ni-Cd etc. batteries - you have to go through the following procedure:
1) charge the battery to 100%;
2) let the battery discharge until the phone shuts itself down;
3) plug the wall charger into the phone, boot the phone up then charge the battery to 100% without interruptions.
If the above procedure does not yield the expected results, you can try fully charging the phone (LED showing green) with it completely turned off (after completely draining it). Again, the charging procedure should not be interrupted.
Source: personal experience - had to do this twice after installing new ROMs, as the phone was shutting down at ~14% (working like a charm now).
Regarding the matter of battery wear because of complete discharges, Li-Ion batteries do indeed have a lower cycle count than old-school batteries, but the standard charge/discharge number a Li-Ion battery can take is ~350, so you can't damage the battery pack by doing a full cycle per month (required to keep the battery meter accurate).
Good luck!
Click to expand...
Click to collapse
Thanks for your answer...
Today I realized that it my concern was a quick one. Today, I discharged battery to 0 percent, plugged the AC charger while it's OFF and charged it for around 2h22m until Led-green-full; then turned on the phone with charger plugged and plugged it off just after the boot process. After that, I let the phone to discharge (I helped it a little )
I actually saw "Plug your charger" warning this time, and according to Bat. Mon. Widget, it gone down until 13%! If I do compare the mV values with the old ones, I can see that somehow the phone does learn which mV value correspond to which percentage better.
Even though it gone from 13% to 0% in two minutes, it's at least better than 30% to 0%.. Also, when I check the readings after I plugged in, I saw that percentage-voltage matching is slightly higher, showing that the phone now shows lower percentage for the same voltage - which shows that it learns percentage better.
After one or two charge-discharge cycle, I think it'll learn absolute 0
BTW; the battery says 3.4V 1400mAh and my maximum voltage is 4160mV (100%) and minimum is 3415mV (0%). Are these values normal, you think?
PS: What I'd recommend from anyone who loves flashing ROMs as much as I do is: AFTER YOU FLASHED A NEW ROM, CHARGE YOUR BATTERY TO FULL (100%) AND ERASE THE BATTERY STATS. AFTER THIS, NEVER, I SAY, NEVER ERASE YOUR BATTERY STATS FOR LONG TIME IN ORDER FOR YOUR PHONE TO LEARN STATS BETTER! Erase after long time, say 3 months for wear effects to be accounted, but well, I think you should be fine even after you don't do this
Maybe you did already know that, but, well, I learned it hard way
EDIT: Phone shutdown at 13% after this, but I think it'll do better in time..
Can't Calibrate the Widget
I am having a similar issue with my htc aria. Problem is that it gets to about 78% and then won't go any higher. It even shows (in Battery Monitor Widget)
"Discharging" and "AC plugged". I have let it sit plenty long enough to be fully charged and then completely discharged it (until it shut itself down, which was not 0%) and recharged until it reaches 78% again and stops charging. I'm guessing it is so far out of whack that it says I'm at 78% but I am really at 100%.
The widget says to charge to 100% and then drain completely to 0% to calibrate. I can't do either from what I can tell. So what to do?
theGanymedes said:
Today, I discharged battery to 0 percent, plugged the AC charger while it's OFF and charged it for around 2h22m until Led-green-full; then turned on the phone with charger plugged and plugged it off just after the boot process.
Click to expand...
Click to collapse
Quick tip - let the phone charge for another hour or so after the light goes green (when charging it while powered off). I've read that the light goes green at about 95%. It takes another hour for the phone to really charge to 100%. That's because Li-Ion batteries use two stages to charge: a fast one and a slow one. More details here.
Glad i could help.
P.S. - It also took me two complete charge/discharge cycles to fully calibrate my battery meter after switching from FroYo to Gingerbread.
@vkyjackie - Try fully charging the phone while powered off. If it still doesn't fully charge (LED green), then you might have an issue with either the battery pack or the wall charger.
I have now done three cycles now drained to 1% and put on charge over night when I unplug and check the phone it says 98% and drops 2-3% within 5 mins of use. But if I plug it back in it will then go back to 100%. Anyone else?
Martinp86 said:
I have now done three cycles now drained to 1% and put on charge over night when I unplug and check the phone it says 98% and drops 2-3% within 5 mins of use. But if I plug it back in it will then go back to 100%. Anyone else?
Click to expand...
Click to collapse
There have been threads about this already. Batteries, once charged fully, cannot 'keep charging', so they will stop charging until it is low enough to charge again.
This protects the battery from all sorts of nasty and evil things.
^ precisely. Batteries shouldn't be pegged at 100% and continue to be charged. The firmware lets it drain down then charge up again. You can just get 'unlucky' and unplug at a point where its discharging and at 98%.
I remember that happening with the Nexus S. I'm thinking it must be a Samsung thing. It's just one of those weird OEM things like, Motorola phones measuring the battery in 10% intervals.
All manufacturers charge their batteries this way but there are many ways to mask that process. People apparently want to see a fully charged phone when they plug it off the charger. They don't mind that their phone drops to something between 95% and 100% in a matter of minutes as long as it's "full" upon disconneting. Seems Google just displays the correct charge instead of pretending to be on 100%.
gokpog said:
All manufacturers charge their batteries this way but there are many ways to mask that process. People apparently want to see a fully charged phone when they plug it off the charger. They don't mind that their phone drops to something between 95% and 100% in a matter of minutes as long as it's "full" upon disconneting. Seems Google just displays the correct charge instead of pretending to be on 100%.
Click to expand...
Click to collapse
Pretty much. The G2 with stock firmware (and from what I remember with the Evo 4G w/ stock), HTC charges to 100%, discharges back to 90%, and charges back up again. etc.. The LED charge indicator turns green at 90% (so according to them, anything about 90% is a "full charge").
You can see this in regular use. There are days where my phone sits at 100% for hours, and others where it only takes an hour to tick down do 99%, even with the same usage. Just depends what "state" the battery is at when you pull it off charge in the morning.
Thanks guys im happy if its one of those oem quirks.
Martinp86 said:
Thanks guys im happy if its one of those oem quirks.
Click to expand...
Click to collapse
If by "quirks" you mean honesty then yes.
Martinp86 said:
Thanks guys im happy if its one of those oem quirks.
Click to expand...
Click to collapse
Its not a quirk, they're just trying to preserve your battery health.
I've seen a few post regarding the 4.3V at 100% thing, but they're too old and haven't really given me much information.
My main issue is that I'm experiencing unusually rapid battery drops after my phone reaches 12% charge, it'd drop to 0% in just a few seconds. I downloaded a few battery calibration apps thinking that it might be a calibration issue. In that process, I noticed that the voltage read by these apps (and even in the *#*#4636#*#* menu) when fully charge is 4,38 volts. It was my understanding that Li-Po batteries should be fully charged at 4.2 volts and that charging past that point is harmful for the battery.
I also noticed that if at this point (charged at 4.38 volts - 100%) I unplugg the charger, the battery indicator would show 100% for a while, until the voltage drops below 4.2V, at that point the porcentage would change to 99%, so it seems that the device is set recognize 4,2V as fully charge, but it continues charging after that point. Also, the green light turns on at 90%, is this normal?
I tried calibrating using this app but with no results. I'm trying the manual calibration now. What is going on here? Could this be a clibration issue or do I have a faulty battery?
I think it is not normal. My P6 drops even a little bit slower from 10%. current my P6 is on 6% and 3,627V. (Edit: Turn off: 3,55V / After charge 100%: 4,32V)
Next time i will charge, then i post the Voltage at 100% for you.
To calibrate the accu you don't need any app. Use P6 until it is automatic power off. Now turn it on so often until it will not start anymore, and only show a red accu on screen. Now charge to 100%, turn on, unplug charger. Now your accu is calibrated.
heross said:
I think it is not normal. My P6 drops even a little bit slower from 10%. current my P6 is on 6% and 3,627V. (Edit: Turn off: 3,55V / After charge 100%: 4,32V)
Next time i will charge, then i post the Voltage at 100% for you.
To calibrate the accu you don't need any app. Use P6 until it is automatic power off. Now turn it on so often until it will not start anymore, and only show a red accu on screen. Now charge to 100%, turn on, unplug charger. Now your accu is calibrated.
Click to expand...
Click to collapse
Thanks, heross. So apparently the >4.2V @ 100% is not so unusual. Does your phone remain at 100% for a relatively long time and drops to 99 after the voltage is below 4.2V? Mine does that, and it also turns the led green when it reaches 90%.
I'm sure the dropping from 12% o 0% in seconds cannot be normal, but I'm wondering if the above is a symptom that something is wrong or
if it's normal.
EDIT: Ok, the phone just turned off by itself, the quick drop hapenned as usual (12% to 0% in less than a minute) and the voltage fluctuated between 3,1 and 3,3 volts in the process, maybe even less than 3.1 V, but I'm not sure. I took a series of screen shots 2 seconds apart, I'll post them when I turn the phone on again, I'll let it charge as you suggested.
Yes LED green at 90% is normal. My P6 drops to 99% after 1-2minutes screen on or after a boot without charger.
12% to 0% in seconds is definitely not normal. Normal it goes down very slowly to 3% then it comes a Info and after 30sec it power off.
Hi
heross said:
Yes LED green at 90% is normal. My P6 drops to 99% after 1-2minutes screen on or after a boot without charger.
12% to 0% in seconds is definitely not normal. Normal it goes down very slowly to 3% then it comes a Info and after 30sec it power off.
Click to expand...
Click to collapse
Finished charging.
I've turned the phone on and it has been sitting at 100% for about 25 minutes at 4,348V with the screen on. (I even played a video with full brightess). After that it droped to 99% and 4,079V[/B]. That can't be normal.
I saw that the P6 battery is rated 4,35 volts, so i'm not too worried anymore abut that voltage and everyone else seems to have the same values, but this quick drop with 12% and the fact that it stays for so long at 100% does worries me.
The screenshots were taken 2 or 3 seconds apart. It doesn't give me a low battery warning at 15% like most phones, but at 8%
I'm still having this extremely annoying problem. The goddamn battery goes from 12-13% to 0% in a blink of an eye. I just plugged the charger at 8% and it show 0% right after and started charging from there. Voltages are strange too, it shows ~3,6 volts when it started dropping quickly. It has charged ~20% in less than ten minutes. Look at this behavior: sudden voltage drops, never went below 3,3V and dies at 3,6V (almost nominal voltage)
I've tried calibrating several with several methods a few times, I'd prefer to stop doing that since I know it stresses the battery.
Has anyone had this issue? Can someone please shed some light on WTH is wrong with this troublesome phone?
Saw this post now. I have the same problem but it is from 9% to 0% . I don't think it is the battery, i think it is how android reads your battery info. I managed to calibrate mine by charging it when off from 0% to 100%-didn't last for long, the problem appeared once again.
It stays to much at 100% after charging, so we have the same battery life. Might be the kernel, don't know. I home when emui 3.0 is relased comes with a new kernel as well.
mcgyani said:
Saw this post now. I have the same problem but it is from 9% to 0% . I don't think it is the battery, i think it is how android reads your battery info. I managed to calibrate mine by charging it when off from 0% to 100%-didn't last for long, the problem appeared once again.
It stays to much at 100% after charging, so we have the same battery life. Might be the kernel, don't know. I home when emui 3.0 is relased comes with a new kernel as well.
Click to expand...
Click to collapse
I also managed to fix it once, I don't remember exactly what I did (I've tried so many things) but it didn't last long either, it discharged normally one time, but the next time dropped from 12% to 0% again in seconds. When will EMUI 3.0 be released?
They said emui 3.0 will be released in the middle of november for p6 but they also said that it will be available for p7 since october -they kept their word and it is available but only for the chinese versions of p7. So i would expect emui 3.0 for p6 in december for the international version.
mcgyani said:
They said emui 3.0 will be released in the middle of november for p6 but they also said that it will be available for p7 since october -they kept their word and it is available but only for the chinese versions of p7. So i would expect emui 3.0 for p6 in december for the international version.
Click to expand...
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Ok, I think I managed to calibrate it, I'm not sure yet, I will update once the battery is drained so I can see how it behaves at low charge, but there are indications that it's working.
If you're experiencing the same problem as me, then you've probably noticed that after your phone drops quickly from 9% (in your case) to 0% and you plug the charger, the battery will charge up to 9% also very quickly. If this happens, then Android is not reading the battery info right and you'll get a 100% reading before it's actually fully charged, and will keep on charging past that point (which I believe is why it stays at 100% for such a long time). It'll obviously drain from 9% to 0% again once it's discharged - because it's not really at 9%, it's much lower.
So, if we can manage to get Android to display normal charging speeds at low charge, then the battery should be calibrated. This is what I've managed to do.
Here's how:
1. Get a Battery Monitoring App (I use Battery Monitor Widget) and set the update intervals to 1 minute
2. Let your battery drain and your phone turn irself off until you can't turn it on
3. Plug the charger and turn the phone on. Watch how the charge increases in this process, it'll most likely charge too quickly (See graph screenshot - blue arrow: a steep slope indicates quick, abnormal charging speed readings)
4. Wait 5 minutes or until it reaches 10-12%
5. Unplug the charger and let the battery drain again. Watch how it discharges, if it charged too quickly in step 3, it'll most likely discharge quickly too here (You can see in the graph screenshot that the discharging slope in this process is also very steep)
6. When it says it's going to turn itself off in 30 seconds, plug in the charger (don't let it turn off).
7. If the 'turning off' message appeared, say, at 2%, your phone will probably display 0% after you plug the charger (i know this makes no sense, but it happens like that)
8. Let it charge and watch how it's charging.
After doing this my battery charged at a normal rate (Graph screenshot - red arrow) and it behaved normally approaching full charge (current started decreasing approaching 100% - green arrow). It didn't stay for ages in 100% after unplugging the charger either, just 1 hour in deep sleep (2nd and 3rd screenshots), which I think is fine because I used to unplugg the charger at night and wake up to a 100% battery, so it seems Android is reading battery info correctly now.
I hope this works for you too, mate (And that it will last more than one charge cycle).
I'll update tonight with low charge behaviour, but I'm pretty sure it'll discharge normally.
EDIT: It didn't actually eliminate the problem, but it got a little better, it now drops from 7% to 4% (instead of 12-13%) and stays at 4 for a while.