Database Develop

Battery Accuracy Problem

Hi everyone, well when i charge my battery all the way to 100% its fine, i use the device as an mp3 player as well which in my case brings down the battery 10%, but most of the time my battery meter is not accurate, for example it will say 54 percent but when i restart the phone it will shoot up to 75 or something, it always does that, is there any hardware problems or anything?

Battery Trouble
Hello MimoG3
This may or may not be related, but I remember after restoring from a backup a few months ago and removing the battery prior to this the device battery meter was very inaccurate. After the restore, the battery extremely low warning came up because it thought I had 0% battery. Long story short, after a while I noticed the battery was not seated properly. So I took out the battery, cleaned the contacts, and put it back in, and it worked fine again. Try cleaning all the battery contacts. Google "Clean battery contacts" or something similar if you do not know how to safely clean battery contacts.
Also, although I have not had this problem that your are describing, try posting your rom and rom version, radio, device information, battery s/n if possible, and other device info should it turn out there is a bad batch of batteries or devices.
-Dave

i have noticed when i restart the phone once in a while and when the battery is fully charged it will think its empty and shut off the phone, to fix that i take out the battery and it starts up again. also sometimes it freezes at startup until i take out the battery but that happens when i restart as well.

Leave your phone on playing music until it turns itself off because of low battery. Remove battery 10 seconds, put it back in and turn on again. Repeat until the battery is really empty and the phone turns off less than 5 mins after you turned it on. Plug charger, turn on, leave until fully charged. This should improve accuracy. Avoid removing the battery if not needed.

ive done something similar to that, i turned on the wifi, bluetooth and gps on so that it would drain the battery fast, then when it turned off i turned it on again with all those things off except the GSM Radio, then eventually it shut off once it stopped turning on i charged it all the way. it still didnt help

battery measuring is not really that much of an exact science
only way to tell the % is
when a batt being pulled current from the volts drop
the less juice left in the batt the more it drops
so the device measure the volts
and makes an educated guess how much juice is left
just after a reset the batt could very well perform a bit better
for a few mins voltWise

MimoG3 said:
when it turned off i turned it on again
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Did you remove the battery? The phone doesn't usually reset the meter if you leave it in.
@rudegar: No, most recent devices including HTC phones don't only use the battery voltage but count how much energy they use / charge to the battery. That usually allows more precise measurement, but can also sceww up if uncalibrated, and is really annoying as it doesn't want to use higher capacity batteries correctly.

Froyo FRF85B Battery Life Quirks

I don't know if I am the only one seeing this, but when I had Eclair, I had crap battery life, to the tune of 10 hours or so. (Granted this may not be crap for Nexus One but it is crap based off past phones I have had.) I installed FRF85B last night and discovered some weird glitches.
First off, when it was in my car dock, it wasn't charging yet the battery life kept dropping, I powered off the device, and powered it back on 10 minutes later (still in the dock) and no change stayed at 91%, still wouldn't charge. I then powered it off, took it out of the dock, plugged in the car charger cable directly and powered on my N1, when it turned on, it said I had 100% battery life. I then plugged it back into the car dock, and voila it started charging.
Secondly, originally when I had unplugged my N1 this morning I used it for about an hour at 5AM and it dropped 2% I plugged it back in to top it off expecting the same crap battery life from Eclair, yet so far, my phone has been fully topped off (from the car dock) for the past 40 minutes and I've made about 20 minutes of phone calls on it, yet it still is reporting 100%. So either Froyo can't properly report battery life, or it has the potential to have absurd battery life. Anyone else experiencing anything like this?

First off - you still didn't search this forum, so you're still thinking that an overcharging protection that doesn't allow you to charge unless you drop below 91%, is a quirk. It's not.
Second, wiping battery stats and making battery calibration procedure ONCE will give you a good starting point to measure something.

Jack_R1 said:
First off - you still didn't search this forum, so you're still thinking that an overcharging protection that doesn't allow you to charge unless you drop below 91%, is a quirk. It's not.
Second, wiping battery stats and making battery calibration procedure ONCE will give you a good starting point to measure something.
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Click to collapse
The quirk isn't that it wouldn't let me charge that way, the issue was, my battery reported 91% yet when I rebooted the device with the charger directly plugged into it, it immediately showed 100%. So pretty much over the course of 30 seconds I gained 9% battery life.
I wiped my device to factory settings before upgrading to Froyo, and after as well, since my device is not rooted, my understanding is I cannot wipe my battery calibration log.
I did drain my battery fully after upgrading to froyo last night and did a full charge as well.

What you're describing looks like the statistics of the battery is "lying" a bit. I believe it can be thrown a bit off by trying to charge it when it's in 91-100% range, but I don't know the exact way it works, so I can't say much about it.
Indeed, if you're not rooted, wiping battery stats is not an option. Several times of full charge and long discharge (you don't need to go below 20%, to prevent harming the battery) are helpful in correcting the statistics.
If you get a chance to try, please repeat this again (having the phone at >90%, turning it off, plugging it into the charger and turning it back on). If it shows "Charged" again - it might be a bug worth reporting.

Jack_R1 said:
What you're describing looks like the statistics of the battery is "lying" a bit. I believe it can be thrown a bit off by trying to charge it when it's in 91-100% range, but I don't know the exact way it works, so I can't say much about it.
Indeed, if you're not rooted, wiping battery stats is not an option. Several times of full charge and long discharge (you don't need to go below 20%, to prevent harming the battery) are helpful in correcting the statistics.
If you get a chance to try, please repeat this again (having the phone at >90%, turning it off, plugging it into the charger and turning it back on). If it shows "Charged" again - it might be a bug worth reporting.
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Click to collapse
I'll have to try it again tomorrow morning, first see if it happens under the same circumstances and go from there. One thing I do remember is the widget I was using "Battery Left" reported that at 91% I had 4100 mAh left in it, which was interesting, and when it went back to 100% it had 4120 mAh which makes me think the OS wasn't actually reading the voltage and thought it was just draining the battery instead.
EDIT: Just realised I had my wall charger with me, battery was at 90% figured I would try, real quick to attempt to replicate the problem, I was unable to, with a direct battery connection, but it could be due to a voltage issue or be related to why plugging it in directly to the car charger resolved the issue. My gut feeling is, it has to do with the dock itself and the pins it uses.

my battery often is charging and it hits 93% and immediately jumps right to 100%. it skips the last 7% or so. i think what is happening is you just finally experienced this issue, which many of us have already posted about in battery threads, but it just happens to coincide with froyo so you are thinking its new and related. the nexus ever once in a while battery meter just gets thrown off and will jump up to 100% because it really was full, just had to catch up the meter. you really should pay attention to the voltage more than percentage, using battery life widget. i know my battery is fully charged at 4.172 volts. and sometimes it hits that but still only shows 94%, so it adjusts itself in one fell swoop.

The issue is I did an extra full charge about an hour ago so I can make it till midnight and it went through all the numbers from 89-100 with no issue
Sent from my Nexus One using XDA App
Addendum: Also it seems to be voltage is not that good of a decider of how much my charge is. Before Froyo, until I dropped below 94% I was always above 4 Volts, now I drop below 4 Volts at 96%.

So this morning I was able to replicate the problem, only it was outside of the car dock, I was able to get this problem to reoccur with the wall charger. I unplugged it from power, used it a little bit and then topped it off for the day, it was at 96%. I saw the green light go on, and thought nothing of it, 20 minutes later I went back to it and it was still at 96% and showed that the battery was fully charged.
I checked the Battery Left widget and it was saying the battery was fully charged even though it said 96% left also. I did make a crappy video uploaded to youtube from my backflip to show as well what I am talking about.

AFAIK, The green LED will light when you're anywhere above 90%. It's not a function of charge being complete. Check it.
Also, if you plugged it in with 96% - this is the behavior to be expected, since the phone won't start charging unless it has below 90% to begin with, and it'll show "Charged" - because it's not charging (to prevent overcharge).
Again, fail to see any problem in what you're describing.

Jack_R1 said:
AFAIK, The green LED will light when you're anywhere above 90%. It's not a function of charge being complete. Check it.
Also, if you plugged it in with 96% - this is the behavior to be expected, since the phone won't start charging unless it has below 90% to begin with, and it'll show "Charged" - because it's not charging (to prevent overcharge).
Again, fail to see any problem in what you're describing.
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Yet my phone has always been able to charge when above 90% before froyo. This behavior is new to froyo for me at least.
Sent from my Nexus One using XDA App

It means that you've never paid attention to that until now. It's working this way since the phone was out (with stock Eclair) and if I'm not mistaken - it's not controlled by OS at all.

I did pay attention to such actually because of the fact that I had been getting piss poor battery life. This has never happened before. In the morning I would use the device a little then top it off because I noticed that works give better battery life.
Sent from my Nexus One using XDA App

Well, you had a buggy phone that has now corrected itself. Welcome to the way it was supposed to work from the beginning.
Topping off the battery at 90%+ contributes to battery degradation - heating from overcharging. So you were actually damaging your battery.

[Q] CM (and others?) battery meter complete screw-up

My battery never charges above ~76% when plugged in. After rebooting however, it is very much at 100% and lasts for a good amount of time. This is not necessarily a question, but I wonder if others are experiencing this too and if there is a fix? Read below.
I noticed that my battery life got very bad after installing custom roms. I also found out that this happened because I sometimes kept the phone plugged in while flashing, something that totally screws up the battery reading. So, I followed this guide to calibrate my battery and it worked.
Now, whenever the phone is plugged in it NEVER goes to 100% when charging. Maybe 80% if leaving it for a while (10 hours overnight). I'm worried about frying the battery. Is there a fix?

It is only a matter of presentation. It actually doesn't mean your batt is broken. Plug it and charge it overnight. Then discharge only for few percent and plug it back in. It should go to 100%.
Sent from my HTC Legend

Thanks, I'll give it a try.
What I'm concerned about is if the phone "thinks" the battery isn't recharged and keeps squeezing juice into it when in fact it is full (which a reboot will show)? That's not good for the battery. It should go into trickle charge after reaching 100%..

The process described in the desire forum is also known as formatting the battery. In fact most of battery manufacturers (lithium battery manufacturers) recommend doing this in a slightly different way:
Before first use:
1.) Before powering the device on, plug it in and let it charge until the LED is green (fully charged)
2.) Then take the battery out of the device and wait an hour (to make sure all the chemical processes in the battery are as idle as possible)
3.) Then plug it back in, while still off and let it charge untill green LED
4.) use the device....
You can practice this slightly modified with first step being:
Discharge the battery (by normal use)until only few percent are left (1 - 5 % are OK)
I've done these steps with my Mugen extended battery and I was getting around 4 - 5 days on Legend, now I'm getting 2 - 3 days on Desire S, but the ROM isn't very optimized yet, I believe it will be better in time...

Just one thing... Why is this in Development!?

No Idea.....
can mods move this?

BlaY0 said:
It is only a matter of presentation. It actually doesn't mean your batt is broken. Plug it and charge it overnight. Then discharge only for few percent and plug it back in. It should go to 100%.
Sent from my HTC Legend
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sz1a did this solve your problem? Have the same problem with every firmware i've tried....

peddalion said:
sz1a did this solve your problem? Have the same problem with every firmware i've tried....
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Definitely did not solve it but at least the battery performance is ok. It just stays at 78% for a few hours drops from there. Very weird but as long as the battery doesn't get broken I guess it's ok.

Do you have some 3rd party battery installed in your Legend? I have one 1,5 Ah in mine and it is acting the same way. It doesn't bother me too much coz it was cheap... it lasts 48 hrs with data always on and moderate usage. I noticed this that when I charge it overnight and it reaches 80%, unplugging it stays at 80% for several hrs and just after it starts dropping if I plug it again, meter reaches 100%. It's weird but as I said I can live with that

I've got exactly the same issue with stock 2.2 ROM. I've never rooted or CM my phone; I was wondering if CM would do it, but doesn't look like it.
android forums /htc-legend/265545-battery-doesnt-fully-charge.html
(sorry, I can't post links; maybe an admin can fix the link for me?
This seems to indicate it's a phone hardware fault and requires a new Legend to fix! My big worry is, as stated, that the charging light never goes green; therefore is pumping lots of power into a potentially full battery.

Battery failure or ics(topo v30a) bug?

Hi everybody,
Since few days my battery has a weird behavour: the percentuage falls instantly of 20% 30%, after few second it comes back at normal value, it can provoke a shutdown of the phone . In your opinion this is an ics bug or is it the battery?

I've had a similar issue. oddly sometimes when i restart the phone, the date is reset, and the battery % had been put below 0% i see on the battery status page the graph has been reset. and there is a red line right down the left side of the graph.
the fact that everything seemed reset, when normally a restart does not reset the battery status, is pretty odd. almost like the cmos battery on a pc is pulled, and the bios needs resetting.
but aye, my batteries have not dropped % at odd times. but randomly, if i was to manually restart, there is a chance my battery status gets reset. i know this is a different issues. but i believe they may be related. phone otherwise seems to work fine. if the phone is on from 100% right down to 6% i've not had a problem with regular running of the phone.

necrowakker said:
I've had a similar issue. oddly sometimes when i restart the phone, the date is reset, and the battery % had been put below 0% i see on the battery status page the graph has been reset. and there is a red line right down the left side of the graph.
the fact that everything seemed reset, when normally a restart does not reset the battery status, is pretty odd. almost like the cmos battery on a pc is pulled, and the bios needs resetting.
but aye, my batteries have not dropped % at odd times. but randomly, if i was to manually restart, there is a chance my battery status gets reset. i know this is a different issues. but i believe they may be related. phone otherwise seems to work fine. if the phone is on from 100% right down to 6% i've not had a problem with regular running of the phone.
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Click to collapse
however my battery has 1 year and now i wanna buy a new battery. For you this is a good battery? http://www.amazon.co.uk/Battpit-tra...8G/ref=sr_1_93?ie=UTF8&qid=1354948855&sr=8-93

disti84 said:
however my battery has 1 year and now i wanna buy a new battery. For you this is a good battery? http://www.amazon.co.uk/Battpit-tra...8G/ref=sr_1_93?ie=UTF8&qid=1354948855&sr=8-93
Click to expand...
Click to collapse
currently testing it, only became available from november, my initial tests gauged it at 1740mAh or so, did a few tests, still running my long term standby test to see how long on minimum use it can last.
but under medium to heavy use, i got a 10 or so hours on it. you can see my current report on it on the replacement battery thread. but so far, this battery has been pretty good.
the odd battery issue i've experienced has been with both batteries, so i dont believe there is anything wrong with the Battpit battery. but im still testing it ^.^

Battery

Hello,
for some time now i'm having problems with the battery.
the cel, it shuts down with 55 ~ 60% charge yet !!!
when restarting the device it goes from 60% to 1% ... and when loading it soon returns to the same 55 ~ 60%, until reaching 100%.
I tried to do battery calibration through specific apps but without success.
any suggestions to try to recover the battery ???

Punk77 said:
Hello,
for some time now i'm having problems with the battery.
the cel, it shuts down with 55 ~ 60% charge yet !!!
when restarting the device it goes from 60% to 1% ... and when loading it soon returns to the same 55 ~ 60%, until reaching 100%.
I tried to do battery calibration through specific apps but without success.
any suggestions to try to recover the battery ???
Click to expand...
Click to collapse
Calibration and battery recovery methods are useless. If your battery is as described, it is highly recommended to replace it.

raptorbrz said:
Calibration and battery recovery methods are useless. If your battery is as described, it is highly recommended to replace it.
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Click to collapse
maybe it's time to retire this tired old cell ...

Punk77 said:
Hello,
for some time now i'm having problems with the battery.
the cel, it shuts down with 55 ~ 60% charge yet !!!
when restarting the device it goes from 60% to 1% ... and when loading it soon returns to the same 55 ~ 60%, until reaching 100%.
I tried to do battery calibration through specific apps but without success.
any suggestions to try to recover the battery ???
Click to expand...
Click to collapse
Since the middle of last year I have been experiencing the same problem as you. The phone often restarts on its own and the power button does not match precisely.

I replaced the battery myself last year for about USD$30. It took me about an hour because I was extremely careful not to break anything. I followed this guide and it was very helpful.
The only issue I experienced was that the loudspeaker (not the earpiece, but the speaker which is activated when you select speakerphone) did not work after I put it back together. But I easily found a fix for that as well.
Just be sure that you buy the replacement battery kit with all of the tools, etc in one package. Cost like an extra USD$5 but it was totally worth it.
Now the battery charges and discharges normally and works like new.

jwhite5840 said:
I replaced the battery myself last year for about USD$30. It took me about an hour because I was extremely careful not to break anything. I followed this guide and it was very helpful.
The only issue I experienced was that the loudspeaker (not the earpiece, but the speaker which is activated when you select speakerphone) did not work after I put it back together. But I easily found a fix for that as well.
Just be sure that you buy the replacement battery kit with all of the tools, etc in one package. Cost like an extra USD$5 but it was totally worth it.
Now the battery charges and discharges normally and works like new.
Click to expand...
Click to collapse
I'm glad it worked. Unfortunately the dollar is very expensive here and any type of repair should not be cheap.

For me replacing the battery did not fix the +/-20% shutdown. Lasted longer than the old battery thoug.
Now i soldered a 3000mah battery directly to the battery jack on the pcb (not recomended, you may destroy the unit since you gota break plastics, avoid some screws to not crack the screen and you loose the original back cover that will not fit anymore).
Well it last really longer than before but stills shutdown earlier than the phone thinks it should. So bellow 25% it can shotdown at any time.