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.
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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%
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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.
Related
Hi all
Just after an opinion really, also see if anyone else is having a similar problem with there battery??
I've had my desire now since April, and recently been having issues with the battery. When charging it, the Orange LED charge light will turn green at around 94% charge and still climb to 100%. Then when its charged (for a whole night) I unplug it, battery states 100% charge for about a minute, then drops straight to 93%. I've tried it with a few roms now, standard Rom, froyo, now on pays bravesoul release, and they all do the same...
I've tried resetting battery charge status in recovery console too, but made no difference...
Surely the standard battery can't be on its way out already??
*edit*
Info in my Sig is a bit out of date, so ignore what it says lol! Running latest pays bravesoul release as mentioned, not done any tweaks to this Rom yet!
Install JuicePlotter and then monitor the usage
report back
it should show whats using the battery when it takes a huge decrease
AFAIK the charging stops after reaching 100% (probably as safety measure)
and there doesn't seem to be a trickle charge function to keep it at 100%. This is actually a good thing 'cause Li-ion and Li-poly batteries don't like to stay in the highest or lowest regions too long.
So...charging stops at 100% and after that you're running on battery. Try charging it and unplug the charger when 100% is reached (look at the actual %, not the LED. You will notice it'll go down at the same rate it always does and no jump to 93%.
I think it charges to 100%, then allows itself to drop back to 90% (the phone still shows 100% though) and when you unplug the phone from the wall, it will drop back to the "actual charge".
If you plug it back in, it should start to charge back to 100%.
This morning after I got ready I took my phone off the charger (it had been charging all night and was at 100%) and walked upstairs. About 10 minutes later I turned on the phone and it was at 67% and going down. I had flashed a new rom yesterday and as quick as I could I did during the drain I did a NAND restore. Could this have been actual battery drain or is there something wrong with my phone/stats. Could my phone have stopped charging at 50% and then just said it was 100%? What should I do? Is there anyway to avoid this from happening again?! I cant go to work with a battery at 50%! lol
-.- Searching is your friend.
The Evo has never trickle charged properly. Trickle charging is when you hit 100% battery while charging and the phone will continue to keep the battery charging and maintain this 100%. So 100% > 99% > 100%.
The problem is the Evo doesn't do this. Once it hits 100%, it switches to battery. It will run off the battery till it hits about 90% and then charge again. Some even say it will NEVER charge again after it hits 100%. So when you unplug it in the morning, you end up dropping extremely fast from 100% to 90%.
There are kernels in the development section that fix this issue but there are people who say it will break your phone or burn your battery out faster over time. When trickle charging, your phone will get hot as its constantly draining and charging. That can lead to a burned out battery as time goes on or a damaged phone. I personally have three batteries. I still tried to use this and noticed a drastic improvement but my phone was also pretty warm when I picked it up in the morning. Its up to you.
Also you might want to see if you have your 4G radio on. That is probably the only thing I can think of that would drain it that fast. Either that or your GPS is on and theres an app running thats using the GPS receiver.
i'd say a 30% drain in 10 minutes is unnatural. it wouldnt be myns rls4 that you flashed, would it? this is experianced by some as a "first day side effect". just fully drain and fully charge the battery a few times and you will be fine.
It could be that it just needs a couple drains and I don't want to quickly point the finger at an app that you are using. A lot of times if I actually charge my phone it will be on 92% when I wake up. 67% is a stretch unless that was 10 minutes of a game or YouTube..but still. Drain the battery a few times and see what happens.
i was thinking maybe its some kind of battery stats problem? Could that have caused it?
Hey what's up. I got this G2 with the latest cm7, which is build number 21 and the battery life is horrible. Like 8 hours with an hour of the display being on. I'm coming from the Epic which had pretty good battery life once calibrated.
So what's the proper way of calibrating the G2? I am using the stock kernel that comes with the Cm7 rom right now but I did try the pershoot kernel couple times and underclocked it but it still didn't help. I think all that kernel flashing messed up my battery life. So any ideas? Thanks!
Sent from my HTC Vision using Tapatalk
saywhat4118 said:
Hey what's up. I got this G2 with the latest cm7, which is build number 21 and the battery life is horrible. Like 8 hours with an hour of the display being on. I'm coming from the Epic which had pretty good battery life once calibrated.
So what's the proper way of calibrating the G2? I am using the stock kernel that comes with the Cm7 rom right now but I did try the pershoot kernel couple times and underclocked it but it still didn't help. I think all that kernel flashing messed up my battery life. So any ideas? Thanks!
Sent from my HTC Vision using Tapatalk
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Charge your phone all the way to 100% (not just until the LED turns green, which is around 90%), unplug and boot into recovery, wipe battery stats, boot back into Android and use your phone until the battery drains and your phone shuts off. Keep trying to power up until it won't any more.
Now, plug your phone in (into the wall, not a computer) and charge until full *without* turning it on. Remember, the LED turns green around 90% so you'll need to leave it another few hours after the LED changes. Once you're full, unplug and boot into Android and again use it until the battery is fully drained and you can't power up anymore and you're good to go.
Remember, after wiping stats, during the draining process *do not* plug it in to the charger or your computer as thiss will mess up the calibration.
Its a pain, and takes a day or so, but its worth it. To speed up the draining process, do some process intensive things (video watching, game playing, etc.)
Sent from my T-Mobile G2 using XDA App
OriginalGabriel said:
Charge your phone all the way to 100% (not just until the LED turns green, which is around 90%), unplug and boot into recovery, wipe battery stats, boot back into Android and use your phone until the battery drains and your phone shuts off. Keep trying to power up until it won't any more.
Now, plug your phone in (into the wall, not a computer) and charge until full *without* turning it on. Remember, the LED turns green around 90% so you'll need to leave it another few hours after the LED changes. Once you're full, unplug and boot into Android and again use it until the battery is fully drained and you can't power up anymore and you're good to go.
Remember, after wiping stats, during the draining process *do not* plug it in to the charger or your computer as thiss will mess up the calibration.
Its a pain, and takes a day or so, but its worth it. To speed up the draining process, do some process intensive things (video watching, game playing, etc.)
Sent from my T-Mobile G2 using XDA App
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Thanks for the tip. Now I have been doing some reading and saw some people recommended charging the phone while it is on when it is fully discharged the first time. You recommend while its off? Does it make a huge difference?
saywhat4118 said:
Thanks for the tip. Now I have been doing some reading and saw some people recommended charging the phone while it is on when it is fully discharged the first time. You recommend while its off? Does it make a huge difference?
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I don't think it would make that big of a difference; if you think about it though, you're dealing with the battery and battery only if the system is turned off.
Sent from my T-Mobile G2 using XDA App
True we are dealing with the battery but when we wipe the battery stats I think it only wipes the battery information the phone had in its system. So if we wiped the stats when it is full then let it discharge till completely empty, im assuming, you would have to charge it while its on so the phone can now learn what the battery level is and when its full and its capacity. I'm just guessing I could be wrong though. I'm just going to try both and see what happens.
Sent from my HTC Vision using Tapatalk
OriginalGabriel said:
Charge your phone all the way to 100% (not just until the LED turns green, which is around 90%), unplug and boot into recovery, wipe battery stats, boot back into Android and use your phone until the battery drains and your phone shuts off. Keep trying to power up until it won't any more.
Now, plug your phone in (into the wall, not a computer) and charge until full *without* turning it on. Remember, the LED turns green around 90% so you'll need to leave it another few hours after the LED changes. Once you're full, unplug and boot into Android and again use it until the battery is fully drained and you can't power up anymore and you're good to go.
Remember, after wiping stats, during the draining process *do not* plug it in to the charger or your computer as thiss will mess up the calibration.
Its a pain, and takes a day or so, but its worth it. To speed up the draining process, do some process intensive things (video watching, game playing, etc.)
Sent from my T-Mobile G2 using XDA App
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I have used this method to calibrate the battery and can say that it does have a pretty big impact on battery life. +/- 20% in my case. I also find that I need to re-calibrate roughly once every month or so.
To be clear, there is not such thing as "calibrating the battery", you are calibrating the battery meter (volt meter) on the phone. Maybe its just a semantic distinction, and that is what the OP and subsequent replies are talking about. But many people get this confused, due to the old process of "conditioning" NiCad batteries, which is not applicable to modern cell phone (Li ion) batteries.
In my understanging, you aren't going to increase battery life by doing any of the above, but only making the battery meter more correctly read how much power is left. For instance, if the meter is not properly calibrated, it may read lower than it should. So people think they are increasing their battery life.
I would discourage from discharging the battery to empty. Over discharge of Li ion batteries can possibly (not often, but in a small percentage of cases) prevent the battery from taking a charge. There is a safety circuit which is supposed to prevent over discharge, but it does not always work. Therefore, Li ion batteries should not be discharged lower then 20% whenever possible. Most of us do it from time to time on accident, but there is not reason to do it intentionally. Charge the battery to 100%, drain to 20%, and repeat a couple times. This will get your battery meter plenty accurate. Draining it to empty does not really gain you anything (the battery meter is not that accurate in the best of circumstances, anyway), and can harm the battery.
http://batteryuniversity.com/learn/article/do_and_dont_battery_table
Flashing a new ROM resets the battery meter. So until its properly calibrated, it will give you junk readings. This is one reason why people often jump the gun and think that a custom ROM is getting them poor battery life. Calibrate the meter, and use the ROM for a couple days, then you should get a real indication of what the battery life is like on that ROM.
redpoint73 said:
I would discourage from discharging the battery to empty. Over discharge of Li ion batteries can possibly (not often, but in a small percentage of cases) prevent the battery from taking a charge. There is a safety circuit which is supposed to prevent over discharge, but it does not always work. Therefore, Li ion batteries should not be discharged lower then 20% whenever possible. Most of us do it from time to time on accident, but there is not reason to do it intentionally. Charge the battery to 100%, drain to 20%, and repeat a couple times. This will get your battery meter plenty accurate. Draining it to empty does not really gain you anything (the battery meter is not that accurate in the best of circumstances, anyway), and can harm the battery.
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I was about to post this. Letting a LiIon discharge all the way is more harmful to the battery than recharging it mid drain cycle.
I'm having a bit of battery issues, I haven't flashed a ROM or calibrated my battery meter. So I charge my phone to full while still on, unplug it and drain it until it turns off (NOT until the battery is completely drained, which could potentially damage the battery), plug it up and let it charge while off, and I should be calibrated?
Do you need to have root to be able to reset battery stats?
Sent from my T-Mobile G2 using XDA App
I'm not sure if this has been posted yet, but when I unplug my phone after charging it overnight, it gets to 90% or so in around 30 minutes without use, and goes down at a fast rate throughout the day. If I charge it and unplug it exactly when it hits 100%, I can use the phone fairly regularly and it will take around 2 hours to get down to 90%, and depletes from there very slowly. What's the reason for this, and is there any way I can get the same battery life when leaving the phone overnight?
Running CM7 with incredikernel, although my phone has been this way with countless ROMs and kernels.
pickleman77 said:
I'm not sure if this has been posted yet, but when I unplug my phone after charging it overnight, it gets to 90% or so in around 30 minutes without use, and goes down at a fast rate throughout the day. If I charge it and unplug it exactly when it hits 100%, I can use the phone fairly regularly and it will take around 2 hours to get down to 90%, and depletes from there very slowly. What's the reason for this, and is there any way I can get the same battery life when leaving the phone overnight?
Running CM7 with incredikernel, although my phone has been this way with countless ROMs and kernels.
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Short answer: Yes, you will see better battery life, and no there is not really any foolproof way to make it work if you leave it on the charger after it hits 100%.
Long answer: The Incredible has a battery saver feature built in that prevents over charging by cutting off charge to the battery when it hits 100% (actually 96% according to the people who figured all this out and are way smarter than I am) and doesn't let it start to recharge until it hits 80%. The reason, when you take it off in the morning, it drops so fast is because it is no longer actually at 100%, but has dropped to a legitimate ~90% since having hit the "100%" threshold.
There are some kernels out there that do allow "trickle charging" meaning they keep the phone at a legit 100%, but I don't think many have seen much success using them with the Incredible.
I get around this by charging a bit at night (using anywhere between 80-100%), leaving it off the charger until morning (I usually drop only around 4-5% per 8 hour night) and plug it back in while I get ready and eat breakfast. This usually puts me around 95-100% depending how much I was able to charge the night before and seems to be a much more simple way to handle it than bump charging in my opinion.
search first. It has been asked multiple times.
unreal2k said:
search first. It has been asked multiple times.
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I've seen similar topics regarding the quick drop from 100 to 90%, but the battery life as a whole seems to be much longer when it's taken off the charger immediately after it hits 100%. There's so many topics on here, I can't find exactly what I'm talking about, so it's difficult to judge. I'll definitely try the tip in the second post though. Thanks!
It will charge it up to 100% but it won't stay there if you keep it in. It'll let the phone die down to 90% then it'll keep it at that level.
So yes if you unplug it when it first hits 100% you will have a full 100% battery. If you let it sit for much longer than it'll be at 90%
It's been said that leaving it on charger for a while after fully charged messes with the battery meter.
I always bump charge. Charge it full while on then power off and charge till green lights on. Def gets me more batt life. Im getting 24+ hours on a single charge under normal usage with UD 3.1.1.
sent from my Ultimate 2.33 Incredible
http://forum.xda-developers.com/showthread.php?t=871051&highlight=lying
That should help you out!
Hi, My battery used to stay at 100% for at least 20 min with minor use after taking it off the charger. Now, it drops fairly quickly to 97% with the same usage. Overall I think I am left with the same percentage at the end of the day, but I was wondering if anyone else experienced this.
How old is the battery, are you leaving it on the charger for long periods after it's fully charged. Their longevity wears down so it's going to happen. But you can take some steps to stretch it out to the max. Mine goes from 100% to 95-96% in about 30-45 minutes right now
Wicked Stock Rom w/ Stock Kernel. No tweaks
Saintfyre said:
How old is the battery, are you leaving it on the charger for long periods after it's fully charged. Their longevity wears down so it's going to happen. But you can take some steps to stretch it out to the max. Mine goes from 100% to 95-96% in about 30-45 minutes right now
Wicked Stock Rom w/ Stock Kernel. No tweaks
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Thanks, Its about a month old. It is on the charger for at least several hours after its fully charged. Also, I am completely stock.
Just curious, is your device idle in the 30 min that it takes it to go from 100% to 95%? If not are you doing intensive stuff to takes it to 95%?
mikea3000 said:
Thanks, Its about a month old. It is on the charger for at least several hours after its fully charged. Also, I am completely stock.
Just curious, is your device idle in the 30 min that it takes it to go from 100% to 95%? If not are you doing intensive stuff to takes it to 95%?
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Yeah mostly idle, just running back ground tasks and such. Very minimal use.
Also I think leaving it on the charger for long periods of time reduces the life span of the battery as well. That's why it notifies you to take it off when it's fully charged. And I believe I read that somewhere else also.
But also if you leave it charging all night the phone may say 100% however the phone to prevent it self from charging the battery to long it stops charging it and let's it drain from 90% to 100% and slowly charges it back up. So as not to damage the battery. It keeps following that loop to keep your battery running longer so the first 10% can sometimes be misleading but it's nothing to worry about
Sent from my SGH-M919G using Tapatalk 4 Beta
This was fairly common on the SGS2.
The common way to fix it on that device was to charge it to 100%, then unplug it and plug it back in and wait until it gets to 100% again. Do this 3-5 times and the problem should be gone. It is worth a shot on the SGS4
This can happen when flashing ROMs while your battery is not full, though this is not the only way for this to occur.
I like that last one. Gotta try it out.
The kernel stops charging at 100 percent and doesn't start again until it guys 95. What you're reading as your percentage level is not the exact levels
Say you unplug at what you think is 100 percent but in reality it's actually 98 percent, the software quickly relays this back to the user and adjusts the battery levels accordingly making you think it just drained 2 percent really quickly.
The whole reason it does this is to percent over charging the battery. That will greatly shorten it's life cycle or even worse blow up your battery
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