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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.
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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
Wheres that one thread with the official email response to how to calibrate evo battery? Why isn't that thread stickied? I'm charging my phone right now and I forgot what to do..
If you mean the trick where you charge the phone to 100%, then turn it off, unplug, plug back in until green, unplug, plug back in till green, do that 5 more times, wave your hand over the phone while patting your belly, then unplug and plug in like 10 more times... well thats it
or if you mean battery stat calibration: charge to 100% boot into recovery, wipe battery stats, then reboot and do not plug in till your phone forces a shutdown
this is what your looking for...
elegantai said:
If you mean the trick where you charge the phone to 100%, then turn it off, unplug, plug back in until green, unplug, plug back in till green, do that 5 more times, wave your hand over the phone while patting your belly, then unplug and plug in like 10 more times... well thats it
or if you mean battery stat calibration: charge to 100% boot into recovery, wipe battery stats, then reboot and do not plug in till your phone forces a shutdown
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i think he is talking about this: http://forum.xda-developers.com/showthread.php?t=712990
elegantai said:
If you mean the trick where you charge the phone to 100%, then turn it off, unplug, plug back in until green, unplug, plug back in till green, do that 5 more times, wave your hand over the phone while patting your belly, then unplug and plug in like 10 more times... well thats it
or if you mean battery stat calibration: charge to 100% boot into recovery, wipe battery stats, then reboot and do not plug in till your phone forces a shutdown
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deonjahy said:
i think he is talking about this: http://forum.xda-developers.com/showthread.php?t=712990
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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
yes also have to try thebatterystatewipe too
How often should you need to calibrate using this method?
elegantai said:
If you mean the trick where you charge the phone to 100%, then turn it off, unplug, plug back in until green, unplug, plug back in till green, do that 5 more times, wave your hand over the phone while patting your belly, then unplug and plug in like 10 more times... well thats it
or if you mean battery stat calibration: charge to 100% boot into recovery, wipe battery stats, then reboot and do not plug in till your phone forces a shutdown
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I think patting my belly was what made my battery last longer
ElAguila said:
How often should you need to calibrate using this method?
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Honestly I wouldn't worry about doing any battery calibration. Battery calibration reminds me of breaking in a barrel on a new rifle. If you talk to 20 different people you will receive 20 different methods of doing the task. Generally if there isn't a single known method with proven results you can attribute the method to the placebo effect.
One thing I always wonder about these battery calibration methods is how the tests were performed. A lot of the time people will claim improved battery life but there is often another explanation for the increase in battery life, they rebooted the phone. If there was a process running amok it could very well have lowered their battery life and rebooting the phone simply killed the process thus improving battery life.
Personally I've never done anything special to calibrate the battery on any device I've owned and I've not have battery life problems. In fact when comparing the battery life of my devices vs. my friends who spent a lot of time calibrating we end up having almost identical time in which we can run on battery.
Just my two cents.
I don't really think it improves the battery so much as it makes it give you a proper reading. Mine can say the battery is down to 30% but it charges really fast. So I think it is an issue of reading the battery level properly.
doesn't charging like this deteriorate battery life? you keep pushing and pushing more volts into your battery. I think its better to do a full charge/discharge cycle a few times a week.
You only do it like this once and not every time. Also I have heard that with the lithium ion batteries you don't want to drain them completely or they may not charge up.
evo4gfan said:
doesn't charging like this deteriorate battery life? you keep pushing and pushing more volts into your battery. I think its better to do a full charge/discharge cycle a few times a week.
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Not with lithium ion. IN fact with li-ion/li-poly batteries, discharging them completely can kill them instantly.
ElAguila said:
I don't really think it improves the battery so much as it makes it give you a proper reading. Mine can say the battery is down to 30% but it charges really fast. So I think it is an issue of reading the battery level properly.
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Exactly. It is all about being able to read the battery at 100 percent when it is actually at 100% that way the meter goes down properly percentage wise and you don't lose 20 percent in the first 10 minutes after you unplug the damn phone lol. But the said method does in fact fix this problem. You should after doing the method listed on my website, or mentioned in the email from htc, see less of a drop after removing the charger.
skydeaner said:
Not with lithium ion. IN fact with li-ion/li-poly batteries, discharging them completely can kill them instantly.
Exactly. It is all about being able to read the battery at 100 percent when it is actually at 100% that way the meter goes down properly percentage wise and you don't lose 20 percent in the first 10 minutes after you unplug the damn phone lol. But the said method does in fact fix this problem. You should after doing the method listed on my website, or mentioned in the email from htc, see less of a drop after removing the charger.
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thanks for clarifying.
So, I'm on my Evo today, playing a game (Air Strike). My battery is at 93% when I picked the phone up to play, and the phone is plugged in. Suddenly, with no warning what-so-ever, my phone shuts off. Of course a mini-freak out and many "wtf's" ensue. No warning, no signs, even the led went off. I pulled the battery, put it back, then plugged the phone in again. After that it gave me the blinking light indicating the battery was too low to turn on. After a few minutes charging she came back on and battery was at 5%.
How the hell does a battery go from 93% to 0% in less than 5 minutes, and give no warning at all?? Anybody else ever have this problem?
Wow I've have never heard or that happening before. Maybe a glitch in the battery stash? Did it take awhile to charge up to 100%? Can you reproduce the issue again?
Sent from my EVO (CM 6.1.1) using XDA App
I had this problem with my older phone once. The battery itself may have a problem or your phone is not getting charged properly.
Try These :
1) Try charging the phone overnite from the Wall charger (Not through USB of your computer)
2) If the above does not work, and you have access to another evo battery, then try using that.(try using a friends battery and charger for a day. ) (Ofcourse needless to say the charger and battery must be for Evoonly )
In my case, my phone started working fine again after getting my battery & charger replaced.
Probably shouldn't worry about it too much just yet. Could be something as simple as your battery meter was mis-calibrated. The meter itself is software so it can easily be wrong/off. If it continues you may have a bad battery.
Sounds to me like something is wrong. Did you just get the phone or have you had it?
Idk... The phone had been plugged in for most of the day (hadn't gone anywhere. Lazy day lol) And like I said, the led went completely out as well.
Haven't had the problem again, so we'll see I guess....
Mark_Hardware said:
Idk... The phone had been plugged in for most of the day (hadn't gone anywhere. Lazy day lol) And like I said, the led went completely out as well.
Haven't had the problem again, so we'll see I guess....
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I've seen some posts about the Evo battery shutting off the charge when its being used. Were you using your Evo while it was charging?
If the battery doesn't seem to be giving you percentages that are accurate, you might want to recalibrate your battery.
Common misconceptions sticky (Evo Q&A) said:
Battery recalibration (Thanks to Cyanogen for this and to fachadick for bringing it to my attention).
If you're experiencing higher than normal battery drain, try the following:
1. Charge the phone to full battery; let it keep charging until the battery says it is fully charged. Do not just wait until the light is green, it isn't always fully charged, causing a lot of inaccuracies. (You can check by going to: Settings -> About Phone -> Status -> Battery Level = Full.)
2. Boot to recovery and wipe battery stats.
(To have the most accurate of battery stats, reboot the phone immediately after wiping the battery stats and wait for your ROM to boot completely to the desktop. Once your entire boot is done and you have full access to the phone, go ahead and pull the charger and continue.)
3. Do not charge the phone until after draining the battery completely, resulting in it automatically shutting off. Take out the battery, and keep trying to turn on your phone until it will not turn back on at all.
4. Recharge the phone completely and then use as you normally would.
This is a method that has been proven to work, I am sure there are other ways. My battery lasts longer after doing this and the reading is much more accurate. It might be advisable to do this after every ROM install if you want the most battery life and most accurate battery reading by the phone's software.
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My issue is that When I am using the phone, normally on dolphin or else a chan viewer, my phone will just turn off. Like the battery died. My phone would have somewhere between a 70-20% charge. Most the time it is above 50%. I will power the phone on and it will say I have 1-3% charge left then shut off normally after.
If I plug it into a charger after that and boot it up (or pull the battery then on a charger and boot it up) the phone will come up fine and say I have 70-20% left. Just depends on where it was at before it shutdown. I can look at my battery usage when it comes up and you can see it go from say 60% to 2% after reboot, then back to 60% once I get it back up. There will be gaps in the usage.
I am currently on Shooter with the freedom kernal. I was on chop suey. I have not reimaged my rom, but I have reinstalled the kernal. I have tried to calibrate my battery and wiped the battery info.
Also my phone charges really slow now too. It can take 20-30 mins to go 5% at times.
I think I just need a new battery.
I think you're right
I just wiped battery stats. I let it drain fully, charged it fully. Unplugged for 5 secs and plugged back in light still charging for at least 30. I've on my third time. Just wondering if things are different with the incredible 2 battery. It didn't take this long with my eris. Basically, my phone has turned to fully charged within in 30 seconds or sooner. Wondering if i'm doing something wrong.
sjpritch25 said:
I just wiped battery stats. I let it drain fully, charged it fully. Unplugged for 5 secs and plugged back in light still charging for at least 30. I've on my third time. Just wondering if things are different with the incredible 2 battery. It didn't take this long with my eris. Basically, my phone has turned to fully charged within in 30 seconds or sooner. Wondering if i'm doing something wrong.
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On the Inc1 I would do as follows...
- Charge phone fully with bump charge
- While phone was bump charged and charger still plugged in, boot into Recovery and wipe stats
- Reboot into ROM and unplug cable and use the phone until it was completely drained, not even able to boot.
- Plugged in charger and turned on phone.
Thats all you should need to do. To be honest I dont feel battery recalibration is important anymore because after constantly wiping stats I noticed that battery wear doubled. If you are changing from ROM to ROM then the stats should automatically wipe themselves over time.
Just my two cents and my battery life is fantastic - without wiping
Okay, i was wondering because i've flashed 5 roms in the last week. I wasn't haven't bad battery life, just thought i might need too. Thanks
Calibrating your battery doesn't improve battery in any way. It merely seeks to reset how the battery reports it's usage to the OS, since over time with normal charge/discharge cycles, the battery stats adapt to the user and reporting accuracy is degraded slightly. It's good to do on a periodic basis to correct this.