Database Users

got htc hd2 2days ago had to charge 4times

hi all i have had to charge this phone so much its kinda doin my head in, last night i charged it and took it off at 6pm fully done and my 11pm after taking approx 30pics + 4vids(4min long each) it was down to very low life.
so i chargeed the battery fully again, and this time from 8am ~ 10am today my battery is at 77% i have done sofar
*backlight set @ 30%
*hspda ON
*Weather, facebook download every 1 hour;
*1call, 5min
*3 SMS got, 5 SMS sent
*1hours playing with phone (general settings)
*took 10 photos
*took 1 vid 3min long
from 100% to 77%,

Simple, turn off 3G. On regular GSM my phone was at 37% after 12 hours with at least 30min talking, lots of browsing, emails, texting, and 30 minutes GPS.

Simple, turn off 3G. On regular GSM my phone was at 37% after 12 hours with at least 30min talking, lots of browsing, emails, texting, and 30 minutes GPS.
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did u run with 3g/hspda on before and did it improve alot or not, as i use net alot and really nead hspda

TBH I doubt you are fully charging in 2 hours. The iPhone is the same, fully charging is not till the meter says 100%, that is more likely 80%.
The battery meter may also need calibrating. Personally I would drain the battery dry by running videos etc, and then charge it back up and leave it charging overnight.

Gajet said:
TBH I doubt you are fully charging in 2 hours. The iPhone is the same, fully charging is not till the meter says 100%, that is more likely 80%.
The battery meter may also need calibrating. Personally I would drain the battery dry by running videos etc, and then charge it back up and leave it charging overnight.
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Click to collapse
i charge it alot longer till green light came on not two hours matey, it took two hours to lose that much life lol
ps. i will run a satnav a few hours should run life down and then recharge

My battery was draining fast too. I realised it was because it would stay connected to my data (mobile web for O2 in my case) and never disconnect. I only clicked on the notification bar and saw i was connected to my data for over 1 hour and half. That is a big battery drain. Don't switch to gsm mode - that would suck. What is the point of having such a high end phone and use it in gsm mode?
All I can suggest to you for the time being (until someone figures out how to have data connections auto disconnect after a couple of minutes) is to disable auto downloads for the following:
facebook, weather, mail, stocks, time sync, twitter etc.
You now have to check manually these items. Sucks i know but only way for me to not stay connected to data and drain my friggin battery

That happens to me too..I have everything set to update manually! No internet time no twitter,weather etc..And no other apps!!! And it still connecting by itself and stays this way for hours till i notice it!! Any ideas of what does it try to update??
(dont tell me the obvious ones!!)

My battery was draining fast too. I realised it was because it would stay connected to my data (mobile web for O2 in my case) and never disconnect. I only clicked on the notification bar and saw i was connected to my data for over 1 hour and half. That is a big battery drain. Don't switch to gsm mode - that would suck. What is the point of having such a high end phone and use it in gsm mode?
All I can suggest to you for the time being (until someone figures out how to have data connections auto disconnect after a couple of minutes) is to disable auto downloads for the following:
facebook, weather, mail, stocks, time sync, twitter etc.
You now have to check manually these items. Sucks i know but only way for me to not stay connected to data and drain my friggin battery
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Click to collapse
ok sounds like a good plan matey, im currently playing a video over and over to kill my battery 0% then im going to charge from no power while phones turned off, 5% life left lol....common...
i keep getting message battery low may lose data is this true will i lose data on my fone?

on the old PDA's if you drained the battery ( <1% or something like that ) your data can be gone, its like performing a hard-reset... don't know how it is now though... propably its safe, or it turns off before 0%

br3nt said:
on the old PDA's if you drained the battery ( <1% or something like that ) your data can be gone, its like performing a hard-reset... don't know how it is now though... propably its safe, or it turns off before 0%
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Click to collapse
You don't have to worry about that any more. A different type of memory is used. You can even take the battery out and leave it for days and all your programs and data are still there.

ok people i completely deaded the battery till it wouldnt turn on and started it charging at 15:43, its now 17:00 and still showing orange led light so i will keep checking every 15min to find out...
1) how long to charge from total flatnesss
2) how long battery last tomorrow on full charge from now to when it conks out again
will keep you updated

just for information: HD2 has a battery that needn't get totally depleted to get the full charging cycle like on older battery packs. On the contrary, the battery suffers when completely discharged. It is recommended not to leave it till the phone dies, this reduces the battery life. Charge it whenever possible. I have mine in active dock when driving in car, as well as when in office. I know the battery life could be better but well...

dusanko said:
just for information: HD2 has a battery that needn't get totally depleted to get the full charging cycle like on older battery packs. On the contrary, the battery suffers when completely discharged. It is recommended not to leave it till the phone dies, this reduces the battery life. Charge it whenever possible. I have mine in active dock when driving in car, as well as when in office. I know the battery life could be better but well...
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i dont mean to say ur lieing or anything but do u ave evidence of this, as so many have told me to totally deplete the battery every time, in a few forums around the net

DAMIEN123_666 said:
*took 1 vid 3min long
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I would imagine video recording puts quite a strain on the battery.
Also don't forget that gorgeously massive screen runs from a 1200mAh-ish battery. I have the Xperia X1, with a 1500mAh battery. When I get the HD2 I can't help but feel there just won't be enough juice to go around.
Lower battery capacity + bigger screen = ever-so-slight reduction in battery.
I wonder whether captive or resistive screens take more power?

I'm using wi-fi at home for all data and the battery is lasting forever!
Strongly recommend tying this - see if it works for you?

ok all i have the full charge time of the battery, from complete flaness 0% life to full charge 100% life time taken
start 15:43 ~ finish 18:12 = TOTAL 3:19min.
now i will take note of all i do on the device and post results tomorrow or the next day if im lucky and it last that long lol

DAMIEN123_666 said:
start 15:43 ~ finish 18:12 = TOTAL 3:19min
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Click to collapse
Also the way you charge your battery affects the charge time.
Example:
- Charging through phone using stock charger
- Charging through phone using third-party charger
- Charging using a short USB connection
- Charging using a long USB connection
- Charging through phone with phone off
- Charging through phone with phone on
- Charging through official external battery charger
- Charging through third-party external battery charger
Sometimes stock accessories are slower, others, not so. Some manufacturers refer to a "power charge", for example some Sony Walkmans. For that to work though the phone / device has to be off. Thats how they get those 3min = 3hr charge times.

DAMIEN123_666 said:
ok all i have the full charge time of the battery, from complete flaness 0% life to full charge 100% life time taken
start 15:43 ~ finish 18:12 = TOTAL 3:19min.
now i will take note of all i do on the device and post results tomorrow or the next day if im lucky and it last that long lol
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Erm that's not what I advised. The aim was to re-calibrate the battery meter. All you have done is wait till the batery meter says 100%, whether in reality it's 80%, 75% or whatever. A full overnight charge would have guaranteed that 100% = 100%.
I don't see what you've done other than continue to use it the same as you already were.
I said I doubt you can get 100% in 2 hours, 3:19 isn't much more.

DAMIEN123_666 said:
i dont mean to say ur lieing or anything but do u ave evidence of this, as so many have told me to totally deplete the battery every time, in a few forums around the net
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Click to collapse
No he's right, completely draining the battery isn't good and shouldn't be done too often. regularly topping the battery up is the way to go.

Gajet said:
Erm that's not what I advised. The aim was to re-calibrate the battery meter. All you have done is wait till the batery meter says 100%, whether in reality it's 80%, 75% or whatever. A full overnight charge would have guaranteed that 100% = 100%.
I don't see what you've done other than continue to use it the same as you already were.
I said I doubt you can get 100% in 2 hours, 3:19 isn't much more.
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hi i plan to monitor usage till battery drops dead and then tomorrow night or the net if im lucky i will redo the recharge test over night

Possible battery problem?

I have charged my Nexus One yesterday for the first time. I live in holland so i had to use my USB cable, and the power adapter that came with my HTC hero to plug my USB cable in.
After the phone was charged 100%, i disconnected it from the charger and only downloaded + added a widget to my home screen. After i did that the battery was already down tot 97% :O:O
Is it defective ?

i noticed having to complete a few charge cycles.. charge fully, use it till dead, charge again
now it seems to hold out much longer

Hmm ok i'll try that. But did yours also drain this fast?

what setting is your screen on? seriously though, im sure some other battery experts here would know, but i think they take a few cycles to get to maximum efficiency

malicious85 said:
what setting is your screen on? seriously though, im sure some other battery experts here would know, but i think they take a few cycles to get to maximum efficiency
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What do you mean with screen setting, and what should i put it on?
Sorry totally new to the phone hehe

I've noticed this too. However as soon as the battery reaches around 50% it takes a lot more to drain so it evens out in the end I guess

teihoata said:
I've noticed this too. However as soon as the battery reaches around 50% it takes a lot more to drain so it evens out in the end I guess
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Hmm ok so it also went that fast on your phone? i have been using it for about an hour now and its down to about ~90% =\, concerns me a bit.

Found out something else, concering the usage of the screen. When i look here:
Menu -> Settings -> About Phone -> Battery Use
The phone tells what uses the battery the most or something, but the strange thing is that it says:
Display 55%
Isn't that very high? Maybe that is causing my battery to drain so fast

Battery meters are not an exact science. Its using what it knows about the battery's state to guess of how much % is remaining. The battery meter will need to be calibrated once, and then overall battery should improve with your next normal 3-6 full charges.
Again, you do not need to and you shouldn't repeatedly drain the battery to 0, only once is this needed to set the phones battery meter, unless you clear it (possible within amon ra's bootloader).
As for your observation, yes that is completely normal, there is not a whole lot of definition within 3% of battery as far as displaying it. What the real picture? Enter in #*#*4363*#*# on your dial pad and then go to battery information, and you'll see the accurate voltage. (this is also accessible from "spare parts" if you have it)

Nipje said:
Found out something else, concering the usage of the screen. When i look here:
Menu -> Settings -> About Phone -> Battery Use
The phone tells what uses the battery the most or something, but the strange thing is that it says:
Display 55%
Isn't that very high? Maybe that is causing my battery to drain so fast
Click to expand...
Click to collapse
All %'s here are vs the amount of time on battery (shown at the top in h:m). If you just unplugged your phone and you go looking here, you'll see the display % VERY HIGH... because the screen has been on the entire time its been unplugged
Its a % after all of the usage since last unplugged.

i've noticed my battery life is much better since i got the desktop dock.. lots of people charge until the light turns green then immediately grab it and start using..
leave it for another hour or two and it seems to get much better.

dont know if anyone else has noticed this but the top corner indicator light turns green once the battery goes somewhere over 90%, leaving it charge longer will get you to 100

malicious85 said:
dont know if anyone else has noticed this but the top corner indicator light turns green once the battery goes somewhere over 90%, leaving it charge longer will get you to 100
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Click to collapse
Good point, I did notice this by accident a few times.

Nipje said:
What do you mean with screen setting, and what should i put it on?
Sorry totally new to the phone hehe
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Click to collapse
You probably found this by now, but one flick to the left and you should have a widget for WiFi, GPS, etc. The far right one toggles 3 levels of screen brightness. The brightest two settings really suck down battery.

just a tip, when you are draining it to recalibrate the battery, after you get to the point that the phone shuts off, boot into the bootloader and run that thing till it completely dies... i did this for my phone, sat it in bootloader with a bright ass screen for like 15 min before it finally finished off... get every last ounce of juice out of it before you start charging it back up

Hmm thanks for al the reactions guys. I'm going to recalibrate my battery now, and lets see if that helps a bit .
Then i have a other question, its not about my battery but since i already have a open topic i dont want to create another one .
Can anyone of you test the following:
When you are calling with someone, and your calling volume is on the maximum (so the volume of the speaker that you hold against your ear). Can anyone notice a little crack from the speaker when the other person talks a bit loud or make's a loud noise? I'm wondering if there is something wrong with mine. With several tones the ear speaker cracks a little bit, like the sound is to loud or something?

Nipje said:
Hmm ok so it also went that fast on your phone? i have been using it for about an hour now and its down to about ~90% =\, concerns me a bit.
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Yep sounds about the same on my phone, dont worry about it lol
The draining thing is from the old nickel days, the lithium batteries are made for daily use so just treat the phone as you would normally. The battery will get better as time goes by.
Also I am not having that problem with the speaker

Hmm, I have my device since last week (Netherlands) and the battery usage is frightening. Sucking it dry in about 24 hours. I haven't let it die out completely though: I thought lithium batteries were not supposed to be used that way. Ni-Cad batteries were used that way.
Ah, see here:
Guidelines for prolonging lithium-ion battery life
Lithium-ion batteries should never be depleted below their minimum voltage (2.4 to 2.8 V/cell, depending on chemistry). If a lithium-ion battery is stored with too low a charge, there is a risk that the charge will drop below the low-voltage threshold, resulting in an unrecoverable dead battery.[citation needed] Usually this does not instantly damage the battery itself but a charger or device which uses that battery will refuse to charge a dead battery. The battery appears to be dead or not existent because the protection circuit disables further discharging and there is zero voltage on the battery terminals.
Lithium-ion batteries should be kept cool. Ideally they are stored in a refrigerator.[citation needed]
Aging will take its toll much faster at high temperatures.[citation needed]
[edit] Prolonging life in multiple cells through cell balancing
Analog front ends that balance cells and eliminate mismatches of cells in series or parallel significantly improve battery efficiency and increase the overall pack capacity. As the number of cells and load currents increase, the potential for mismatch also increases. There are two kinds of mismatch in the pack: state-of-charge (SOC) and capacity/energy (C/E) mismatch. Though the SOC mismatch is more common, each problem limits the pack capacity (mA·h) to the capacity of the weakest cell.
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Click to collapse
So, if you want to brick your battery, by all means, suck out all the power.

i have a mytouch but i think the things i do can be used with all androids....first recalibrating is a good way to get a fresh battery...then the brightness also helps along with any wireless things u dont use like wifi gps etc.. they should be turned off an brightness should be low...i have downloaded a app lately called automatic task killer..i think this is better than any other task manager because other task managers dont kill apps wen phone is on standby ..apps r still running wen screen is off an automatic task killer kills them..i think u should download this and also have a task manager to kill apps wen u use the phone..another thing is charging the phone wen its completely off..wait until the the light turns green then leave it on for another hour or two then turn it back on....i have seen an increase in bettery life by doing all this...any one esle have any tips ..let me kno

[Battery Stats] I didn't bring my phone to work today

I had everything turned off. No email, no sync, no wifi, no gps, nothing. I fully charged the battery and unplugged it before I left. Display was never turned on. I wanted to see a completely isolated battery test. The only applications I had active according to my task manager was Launcher Pro.
Time on 10 hours 20 minutes
Battery life left 60%
Battery used 40%
Cell Standby - 40%
Phone Idle - 30%
Android System 20%
Calls (1 missed call) 5%
Display 3%
Maps 2% (Why does maps show up?)
Again this is with absolutely 0 use or syncing going on. Left phone at home, turned on and immediately checked stats when I got back from work.
According to this small test I can't even last a day on a full charge even if I left it completely alone.
Thoughts?

Running stock JI6

Holy stewart Gilligan Griffin.
Why does everyone need to make a thread for personalized information regarding their battery life?!?
I had a g1 n then mytouch n I've never seen such whining over battery life. If I see one more battery thread.......
Sent from my SGH-T959 using XDA App

at least your reply was helpful.

sj_martin said:
Running stock JI6
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Click to collapse
In 1.5 day of standby with every radio off and no sim, my phone only lost about 5% with stock JI6.

I think it is a cool idea. I find that 5% usage for one missed call is very bad. I have really suspected that voice calls kill this battery and that seems to add evidence. 5% for a missed call? That is messed up.

I think this is the aspect of battery life that doesn't get addressed enough: drain during standby. Of course everyone expects to lose some power while the display is on and syncing/other processes are running--but what about when the phone is left untouched? Here are 3 ideas:
3g is a notorious battery drain even when the phone is not being used--use 2g instead.
Freeze or uninstall media hub and other running processes that attempt to run/connect to servers in the background. I removed dmservice, media hub, and all drm processes and this seemed to be helpful.
Use a custom rom--these appear to hold power in standby better than stock roms do.

grennis said:
I think it is a cool idea. I find that 5% usage for one missed call is very bad. I have really suspected that voice calls kill this battery and that seems to add evidence. 5% for a missed call? That is messed up.
Click to expand...
Click to collapse
To add further detail usage time was 45 seconds for the missed call.

sj_martin said:
I had everything turned off. No email, no sync, no wifi, no gps, nothing. I fully charged the battery and unplugged it before I left. Display was never turned on. I wanted to see a completely isolated battery test. The only applications I had active according to my task manager was Launcher Pro.
Time on 10 hours 20 minutes
Battery life left 60%
Battery used 40%
Cell Standby - 40%
Phone Idle - 30%
Android System 20%
Calls (1 missed call) 5%
Display 3%
Maps 2% (Why does maps show up?)
Again this is with absolutely 0 use or syncing going on. Left phone at home, turned on and immediately checked stats when I got back from work.
According to this small test I can't even last a day on a full charge even if I left it completely alone.
Thoughts?
Click to expand...
Click to collapse
Cell Standby indicates that there is an activity that polls something from the network.
if you are so concerned about what it might be, you can see when and how much data is being used by going to your TMO account online and check for the data usage - one of the good features TMO put in place is actually tell you when your phone connected to get what amount of data over the data connection, does not tell you what it was doing though.

Yeah, something is going very wrong in your phone. When my phone is on standby with just 2G on it drains less than 1% per hour. I would definitely recommend getting rid of the drm service and media hub (and Daily Briefing). I also use Autostarts to keep all kinds of random programs from starting at inappropriate times (Really Slacker, does your app need to launch every time the time zone changes?)

Kubernetes said:
I would definitely recommend getting rid of the drm service
Click to expand...
Click to collapse
It is.... DrmUA.apk?

According to Samsung the phone should last 450 hours in standby mode...
Anyway, yeah, I'd be curious to see the same test done with 2g only.

ackattacker said:
According to Samsung the phone should last 450 hours in standby mode...
Anyway, yeah, I'd be curious to see the same test done with 2g only.
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Click to collapse
450 hours rofl.

Looks like i'm going to go off stock and try out some roms now. I assume bionix 1.9 is the new hotness out there? Going to flash and try the same test again and post results.

ackattacker said:
According to Samsung the phone should last 450 hours in standby mode...
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Click to collapse
I wonder if Samsung's definition of "standby mode" is what the rest of us call "off".

I've never had any kind of batt life with this phone...charge everday overnight...start work at 8, use here and there for navi (around 10 mins max, maybe 2x a day) about 30 min avg talk...and mp3 player...get home by 4 and always at 30% or (most often ) less...have had stock/ bionix roms, never changed, no matter what build....it's pathetic..called tmo, they said there are no known issues with batt on this phone...wow...do a google search on it..anyways, they are sending out a new batt..I hope I just got a bad one...seems very random tho, some ppl have all radios on ,screen all the way up and get 10+ hrs...if i left my screen on (say navi on) for more then an hour straight I'd be out of battery..very weird..praying new batt is better...

copied from team whiskey site:
Code:
Battery Conditioning
Does it seem like youre just not getting the battery life you should from your phone? Do all your other friends keep going while you slowly putter into a shutdown? Well pout no more! Simply follow these steps to clear your batter information from the phone and your phone will act better then new! :)
1. Charge phone completely, leave plugged into power
2. Boot into recovery
3. Wipe battery stats
4. Reboot to normal
5. Remove power cable
6. Drain that sucker all the way
7. Recharge fully
8. Rejoice!"

I turned my phone off today. Then I left the house. When I got back the battery was glad to see me. Seriously, I've read just about everyone and almost started my own battery disturbance thread. I've come up with a new thought at least for me. I don't care any more. I have electricity. I have a spare battery and a charger. If my phone wants to last a whole day. Yay! If I use it more because of some game with angry birds or cards or dice, great. I've reached that Mark Twain moment somewhat tweaked when he said,
“Age is an issue of mind over matter. If you don't mind, it doesn't matter.”
I'll tweak it with the last 27% of battery left in my feeble vibrant to:
"battery is an issue of mind over matter. If you don't mind, it won't matter".
Enough already I say! Lets spare the air. Batteries are meant to be used
Back to the regular reading of all the battery threads now.

I think I had the same issue as you. Cell standby was the biggest drain. When you tap on that, do you see 50% time without signal? If that's the case, this seems to be a bug in Android which was somehow introduced in JI6. The best solution I've found so far is after every boot to put your phone in flight mode for a few seconds and back. This fixes the radio glitch, your time without signal should go down way under 50%, and battery drain should stop. Hope that helps.

You should recondition your battery:
Fully charge
Reboot into recovery wipe battery information
Reboot into OS
Unplug power cable
Let battery FULLY drain (do not plug in until fully dead)
FULLY charge battery (do not unplug until fully charged)
This reconditioning should be done after every ROM flash.

[Q] Battery issues

Ye, my battery just went from 48% to 3% in about 3 minutes. Does anyone have any idea why this is?

Same problem here. From about 43 % down to 7 % while it started to charge the battery with the original charger. Afterwards the Tab didn´t charge at all. Battery drained and got very warm.
I Called Vodafone and was told i have to send the Tab in for fixing. I hate waiting for the tablet 3 weeks.
Update: After 2 hrs. of waiting the Tab cooled down and i was able to start it again. Did a factory reset and was able to charge again with the wall mount charger.

Just wanted to bump this as my battery life is miserable and it discharges really fast in standby...
My HTC desire has been on for 52 hours, used for a lot of stuff and is at 20% battery.
The Tab charges to 100%, I unplug it at night and in the morning it has lost approx 10%, I leave it a few more hours and it't down to around 60%. This is with no use and no apps running!
I've tried killing apps or leaving them in memory and it doesn't seem to make much difference. I also use setcpu and have a profile where the CPU speed decreases when in standby to conserve battery?!
If I charge to 100% and use it constantly, I get fair life out of it maybe 4-6 hours of light use - some streaming over wifi, web surfing, kindle, sudoku etc. If I use it occasionally or heavily though, it dies very quick and if I leave it at about 40% on the evening, it's generally dead in the morning.
Why does it discharge so fast in standby??

Check to see if it continually searching for a signal. I've noticed that mine loses a lot of power constantly searching for a signal, cellular and wifi. So, I used airplane mode to conserve power. Remember that it syncs to different services that require it to periodically download data. That may be your issue.
Sent from my SCH-I800 using XDA App

Thanks Chuck, I use it in airplane mode all the time and only use web over wifi (bought unconnected in the UK). Would it still be syncing for email etc? I didn't think it could turn on wifi and sync itself but only when I turn wifi on. I always turn wifi off when not in use. I had problems with widgetlocker asking for superuser permission quite often and that killed the battery quicker so I removed that until it's fixed and saw an improvement.
I'm not seeing the times that other people are though, losing at least 10% overnight and there's nothing really running.
I installed battery doctor and the times it quotes are high for different types of usage and nowhere near what I'm getting.
I'll make sure email and calendar are set to manual update, adjust brightness etc and see what happens. It seemed better when I first got it so perhaps an app is draining it? I installed system panel to monitor this but it's hard to see what is actually draining it, any recommendations anyone???
Quite disappointed at the moment, ipads barely drop 1% overnight and I'd rather not have to turn it off to conserve battery when it should maintain it in standby...

Check the task manager and see what application are running. Also you can go in settings- about device - battery use to see if a specific application is using your battery out of normal. Also , the display is generally the battery hog, you may have set it to a super high level. One last thing you may have the buggy 3d gallery app, and it will show in the battery usage.
P_

this is an interesting problem. its very similar to the Apple Macbook Air.
The Macbook Air was very thin - very nice looking - however it needed to depend on wifi to do most things.
the association i am trying to build here is this: the Tab needs a bluethooth headset so you dont get all your calls broad-casted over speakers and that could drain the battery a lot.
for me the battery drainage didnt seem so bad and its been on for the last 36 or so hours. the battery icon didnt look like it moved so much and i was impressed considering this thing had a gigantic battery. then i loaded up a utility that read the battery and said i had 59% so my jaw dropped. not only is the battery indicator wrong there maybe rogue processes casuing the battery drainage. and this is on 2.2 which is supposed to be somewhat battery efficient.
i dont know - frustration is what i am all about here with this thing. it seems that every time i buy a new android device i want to move to another android device. no one is getting the damn thing correctly setup.

Am at work right Now, Charged the tab overnight, just few minutes ago my battery said 60% left and now the tab is completely dead, wont turn on, I ll wait until i get home to charge, fingers crossed.

Change the battery...
Sent from my HTC HD2 using XDA App

shubh.27hd2 said:
Change the battery...
Sent from my HTC HD2 using XDA App
Click to expand...
Click to collapse
its been charging for 2 hours now and battery is not even warm to the touch plus no power yet... if charging is what you intended....

more than 3 hours of charging and counting and still no sign of life...This device is just 8 days old today from Brand new...

mudstuff said:
Just wanted to bump this as my battery life is miserable and it discharges really fast in standby...
My HTC desire has been on for 52 hours, used for a lot of stuff and is at 20% battery.
The Tab charges to 100%, I unplug it at night and in the morning it has lost approx 10%, I leave it a few more hours and it't down to around 60%. This is with no use and no apps running!
I've tried killing apps or leaving them in memory and it doesn't seem to make much difference. I also use setcpu and have a profile where the CPU speed decreases when in standby to conserve battery?!
If I charge to 100% and use it constantly, I get fair life out of it maybe 4-6 hours of light use - some streaming over wifi, web surfing, kindle, sudoku etc. If I use it occasionally or heavily though, it dies very quick and if I leave it at about 40% on the evening, it's generally dead in the morning.
Why does it discharge so fast in standby??
Click to expand...
Click to collapse
I am experiencing the same thing. Tab on flight mode and charged to 100% overnight. Unplugged at 9am, still on flight mode with no apps running, and it is 88% at 2pm.
12% drop in 5 hours with no usage whatsoever is way too much imo, comparing let say to my HD2, even not in flight mode. Wonder if they have a bad batch of battery for certain tabs........

Just wanna report back after my last post. When the percentage was dropped to 85%, I did a reboot. And guess what, now it displays 95% !!!!!!
5% drop from the morning til now in flight mode seems right and okay. Does it mean the tab is miscalculating the percent left?
PS.
I have been following the voltage in Spare parts this morning. All settings are the same (no apps opened, same screen brightness and in flight mode. Only turn on to record voltage)
94% - 4087mV
91% - 4081mV
88% - 4075mV
85% - 4067mV
But then after the reboot
95% - 4040mV
Man, I am not sure whats going on here........

shinji21 said:
Just wanna report back after my last post. When the percentage was dropped to 85%, I did a reboot. And guess what, now it displays 95% !!!!!!
5% drop from the morning til now in flight mode seems right and okay. Does it mean the tab is miscalculating the percent left?
PS.
I have been following the voltage in Spare parts this morning. All settings are the same (no apps opened, same screen brightness and in flight mode. Only turn on to record voltage)
94% - 4087mV
91% - 4081mV
88% - 4075mV
85% - 4067mV
But then after the reboot
95% - 4040mV
Man, I am not sure whats going on here........
Click to expand...
Click to collapse
let me jump in here again and share a similar deli-ma i had with my X10i.
while i was messing around with some custom roms i decided to stick to one that looked somewhat nice. well the funny thing is the battery indicator would always display 100% and for about 4 hours it would drop ever so slightly. then i removed the battery and put it back in -- the battery indicator showed 0% and i got a red light flashing ....
after screwing around with it for a bit i re-flashed the stock firmware from Sony-Ericsson and magically my battery meter and my battery worked fine.
so to sum up -- it maybe a software issue like the one i had on my SE X10i above?

[Q] How to preserve the battery life in a location with very poor signal

First to clarify my question: I'm not asking how to prevent the daily battery drain in a poor-signal area. It definitely happens unless the phone is switched to airplane mode. My question is how to avoid the shortening of the battery life in the long run if the phone has to be used in such condition.
My workplace is basically a signal black hole to any carrier. With T-mobile I got no service for most of the time but I can occasionally send/receive text messages/emails say every 15 minutes with flimsy connection. There is absolute no way to make a phone call, so I usually walk outside when needed. I don't have WiFi neither so I prefer to keep the phone on to stay on the grid. However my concern is doing so will shorten the battery life eventually due to the constant power draining and recharging, so I come up with some ways for such condition. Please suggest which you think will do the least harm to battery and allow me to receive email and text.
1. Use it normally. It usually consumes 60% of the battery just sitting on my desk throughout the day. I can actually live with it be cause the battery is large enough for me to waste this way. But it harms the battery life without a doubt.
2. Use it with a charger plugged on my desk for most of the time, so it will supply the power for signal searching. Usually if you keep a battery at full charge all the time, it dies soon due to "slacking." My laptop has this problem and its battery basically serves as a UPS now. I have less concern for a phone because it will still be recharged daily.
3. Use an NFC tag to tell the phone it's in the office, and then use some software to prevent the draining like Tasker/Juice Defender. That makes most sense but I haven't have figure out the profiles. I've used Tasker before (thought it's too complicated) and NFC is totally new to me. I would like to take some suggestions if you have done something similar.
Thanks!

wawacoffee said:
First to clarify my question: I'm not asking how to prevent the daily battery drain in a poor-signal area. It definitely happens unless the phone is switched to airplane mode. My question is how to avoid the shortening of the battery life in the long run if the phone has to be used in such condition.
My workplace is basically a signal black hole to any carrier. With T-mobile I got no service for most of the time but I can occasionally send/receive text messages/emails say every 15 minutes with flimsy connection. There is absolute no way to make a phone call, so I usually walk outside when needed. I don't have WiFi neither so I prefer to keep the phone on to stay on the grid. However my concern is doing so will shorten the battery life eventually due to the constant power draining and recharging, so I come up with some ways for such condition. Please suggest which you think will do the least harm to battery and allow me to receive email and text.
1. Use it normally. It usually consumes 60% of the battery just sitting on my desk throughout the day. I can actually live with it be cause the battery is large enough for me to waste this way. But it harms the battery life without a doubt.
2. Use it with a charger plugged on my desk for most of the time, so it will supply the power for signal searching. Usually if you keep a battery at full charge all the time, it dies soon due to "slacking." My laptop has this problem and its battery basically serves as a UPS now. I have less concern for a phone because it will still be recharged daily.
3. Use an NFC tag to tell the phone it's in the office, and then use some software to prevent the draining like Tasker/Juice Defender. That makes most sense but I haven't have figure out the profiles. I've used Tasker before (thought it's too complicated) and NFC is totally new to me. I would like to take some suggestions if you have done something similar.
Thanks!
Click to expand...
Click to collapse
Isn't the issue with batteries related to cycles? I'm not sure it matters that you end up with 40% of battery at the end of the day vs 15% when you charge it up. A cycle is a cycle, more or less I think.
If you don't believe the first point, I also don't think that research really shows that leaving a lithium ion battery plugged in "all" the time has major detrimental effects, and even if it did you would still be using the battery for a good deal of the day, at least the time you're not at work right?
I feel like you might be a little too worried about it.

kanetheninja said:
Isn't the issue with batteries related to cycles? I'm not sure it matters that you end up with 40% of battery at the end of the day vs 15% when you charge it up. A cycle is a cycle, more or less I think.
If you don't believe the first point, I also don't think that research really shows that leaving a lithium ion battery plugged in "all" the time has major detrimental effects, and even if it did you would still be using the battery for a good deal of the day, at least the time you're not at work right?
I feel like you might be a little too worried about it.
Click to expand...
Click to collapse
About the charging cycle, I read something here: http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries. Basically it shows deep charging cycles has more detrimental effects on the battery capacity. My point was if the battery is cycled deeply everyday, it is under much more stress compared to those working with good signals.
Maybe I worry too much but I feel really bad just to see my phone sitting there wasting a lot of battery.

I have had the same problem with you as my office is underground.
From my experience, it's best to turn off data. You can turn off the radio all together, but I guess you still want to have signal where you can.
This can be automated by Taker (haven't used) or Juice Defender. I don't know if Juice Defender Free can do this (it should), but Juice Defender Ultimate have an option to turn off wifi and data when the screen is off.
Having the charger next to your desk is also a viable option. But rather than plugging it all the time, you should charge when it is needed.
Edit: as discussed elsewhere, you should not try to do full charges (0-100%) as this would not work out well for you at office as well as it it will shorten battery life.
Edit 2: Juice Defender Ultimate
=> Enable Advance profile (Status Tab)
=> Go to Control Tab
=> Enable Mobile Data and Wifi control (first and third option)

wawacoffee said:
About the charging cycle, I read something here: http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries. Basically it shows deep charging cycles has more detrimental effects on the battery capacity. Mypoint was if the battery is cycled deeply everyday. it is under much more stress compared to those working with good signals.
Maybe I worry too much but I feel really bad just to see my phone sitting there wasting a lot of battery.
Click to expand...
Click to collapse
Can you try only charging your phone at work? From the options you've listed,leaving it plugged in seems like the best option at work seems like the best option. Assuming you currently only charge your phone once a day, it shouldn't make much difference to switch the charging time to during the work day.This way your peak energy usage will fall on a time when you have unlimited power available and you should have enough battery to go home and come back.

build.prop tweak
There is a build.prop tweak but I can't guarantee that it works.
You can try it out and tell us about it :fingers-crossed:
http://www.s3forums.com/forum/galaxy-s3-hacking-mods/474-list-some-build-prop-tweaks.html
#improve battery under no signal
ro.mot.eri.losalert.delay=1000
The number value is how often to re-connect to the tower. A phone in a poor connection area will
attempt to reconnect all the time, draining the battery. It's in milliseconds so 1000 = 1sec. I wouldn't
exceed 2sec but you already knew you are on your own with this one.

I have the exact problem at work.
My question is if I connect the phone to the charger at work, will the phone runs on the juice from the charger or from the battery? If it runs on the juice from the charger (like laptops), that should have minimum effect to the battery. If it uses the battery and the charger just charges the battery then the battery life will be cut in half (2 charge per day instead of 1 charge per day).

I have terrible signal at work and my Inspire has a small battery. My phone is in power save by lunch. I charge mine during lunch every day and leave it on the charger at night. I generally will not plug it in if I can't charge it all the way up. My original battery is now 18 months old and works as well as it did new. Other Inspire/DHD users have had to replace batteries in less than 12 months, so I don't think my charging cycle variations have harmed it too much.
It only has to last until after the holidays when I can order my N4. Even if I had to try to push it to 2 years, I think I wouldn't worry too much.
Also, by the time it is not under warranty, the batteries will be cheap and will always be easier to change than an iPhone.
Sent using the power of the dark side.

Thanks everyone. Based on the discussion I think I will just use it normally and charge whenever needed. The phone should be my slave not the other way around. I'm not planning to root it, at least not now, so I won't change the build.prop.
I did tried Juice Defender yesterday. It slowed down the battery drain but not very impressively, because it only turns off the data not the entire cellular radio. I installed the app during lunch so you can see the difference from the middle of the day. Google+ was a real ***** because it tried to upload my camera photos with such connection... I turned it off too so it also helped.

"Android OS" should not be this active.
It's possible that you have some background process draining the battery. Try disabling as many services as you can.
If you have Wifi at work try turning it ON. If not then turn your Mobile Data OFF like KyraOfFire suggested.

I get weak signal at my work as well. Thankfully, we have WiFi, so I usually force my phone to use 2g then connect to WiFi. :good:

-Mindroid- said:
"Android OS" should not be this active.
It's possible that you have some background process draining the battery. Try disabling as many services as you can.
If you have Wifi at work try turning it ON. If not then turn your Mobile Data OFF like KyraOfFire suggested.
Click to expand...
Click to collapse
I don't have Wifi unfortunately. I will look into Android OS later on.