Related
This started on suiller's ROM guide, but I feel it's really OT so I should take it outside.
I've had battery issue ever since I got the Diamond. With moderate use (maybe ~15-20min of call per day, email check every 30 min, moderate web browsing) the battery level can drop by ~ 15-20% per hour on average. This means the battery would only last 5-6 hours without charging, which is not good enough to last through a day.
I first looked at whether the phone has any serious battery drain application, and it doesn't. With BatteryStatus I see the battery drain is ~ 100-150mA with GSM on, BT on. When I'm downloading email, or browsing the web, it does go up to 200 ~ 300mA briefly, but that is only when it's transmitting / receiving data. In standby mode with screen off it drains less than 50mA. These numbers seem pretty typical from my experience.
And here's the weird thing - on a typical day, when I wake up, and take the phone off the charger, it can drop from 100% to 93% within 30 min. On the way to work, when I would browse the web lightly, it can easily drop from 93% to 80-85% within an hour. That's pretty bad battery life.
Yet there are instances when I've been browsing the web, or playing MP3, or using YouTube for a good 10-15 min, but the battery level would not drop.
I figure maybe the battery needs to be re-calibrated, so I decided to discharge the battery and recharge it. I know this doesn't help improve the battery life of LiIon batteries, but I was trying to recalibrate it.
What happened, when I was discharging the battery, was I found the battery drop was very quick from 100% down to ~ 50%. From that point on, the battery drop is much slower.
And from 50% to 25% the battery seems to last forever. The most interesting thing is with the battery down to 15%, I did a lot of 3G web browsing, listening to MP3's, turn wifi on, and that 15% of battery lasted a good 3.5 hrs with heavy use until it's so low the phone stopped working.
The whole discharging process ended up taking 10 hours, and that's with HEAVY use for the last 3-4 hours too. That's actually acceptable for battery life (not great, but at least it'll last me through a day outside with moderate use) and obviously doesn't jive with the 15-20% drop per hour when I'm operating in the 50-100% full range.
When I'm charging the battery, I also noticed the level went up from 0% to 70% very quickly ... pretty much over 40 min. BatteryStatus shows it's being charged at +600-700mA.
As the battery gets full, the charging is much slower ... BatteryStatus shows it is charging by ~ 100-200mA only.
With the battery level up to 99%, it took almost forever to finally get up to 100%. I think it took at least 20 min.
So after a full discharge - recharge, I used my phone as normal this morning to see if it's been calibrated, but nope. It still drops from 100 to 93% within minutes of doing virtually nothing, and easily drop to 80% after an hour ride to work.
Does your battery perform the same way? Should I replace my battery? Or is there a way to properly calibrate the battery?
btw location and reception has nothing to do with it. I have good to excellent reception throughout this test.
I'm having the same problem but not with every rom (don't know wich ones, tested almost every rom hero) So is this a piece of software wich shows the live that doesn't work ?? or is it the battery ? As i can see it it's depending on rom thus it's not hardware
But hey I'm n00b
i've noticed that a soft reset or power up will use 3-7% of battery depending on the weather (what else could it be )
don't have the ability to discharge but i agree that in many cases the battery usage drops drastically & there is no reasonable cause
hope someone can figure this out!
From 4pda.ru
http://4pda.ru/forum/index.php?showtopic=85754&st=100&p=2338080&#entry2338080
1. discharge the battery completely (by playing video, audio, etc.)
2. Remove the battery and wait about 1min then place it back (do not power on the phone)
3. Full Charge the phone, wait when LEDs stop blinking (do not power on the phone)
4. When fully charged - remove the battery (do not power on the phone)
5. Wait about 1min then place the battery to the phone and now you can power it on.
If battery is more or less OK it will re-calibrate.
I hope it will help!
STM123 said:
From 4pda.ru
http://4pda.ru/forum/index.php?showtopic=85754&st=100&p=2338080&#entry2338080
1. discharge the battery completely (by playing video, audio, etc.)
2. Remove the battery and wait about 1min then place it back (do not power on the phone)
3. Full Charge the phone, wait when LEDs stop blinking (do not power on the phone)
4. When fully charged - remove the battery (do not power on the phone)
5. Wait about 1min then place the battery to the phone and now you can power it on.
If battery is more or less OK it will re-calibrate.
I hope it will help!
Click to expand...
Click to collapse
Thanks. I tried those steps yesterday and my phone is pretty much behaving the exact same way after the battery cycle.
After all the steps, the battery shows it's 100%. I unplug it, and it drops to 97% within MINUTES literally. Now I plug it back in, and it takes forever to get from 97% back to 100% (> 1hour)
I think it may be a battery problem and not a calibration problem. The drain averages ~ 120-150mA when phone on, screen on, no data, and below 100mA with phone on in standby mode. That seems pretty typical? I'd think the battery should last longer than 8 hours (till it completely dies) in that case.
Where do you guys suggest I buy a new battery for the Diamond (other than HTC directly)? I bought one from DealExtreme but the battery runs ~ 10C hotter than normal all the times ... I don't think I want that as my primary battery.
If you get through a full day with moderate-heavy use on your battery, I say that is normal and good battery life on a Diamond. So, why bother that the percentage is not proportional? I would not get a new battery for this since the problem is only in the reported percentage, not the battery life itself.
I've had plenty of cars that went from full to half tank on the meter significantly faster than from half to almost empty. You know about it and adapt to it, simply.
Hello !
I'm understand you, i have a ELF (Touch P3450), and a Diamond, the same problem appear for the two phones!
Every Morning, when i disconnect from charge my diamond, my level battery go to 93% in 10mns without reasons (One sms, no 3G, no Wifi etc).
My battery go down to 50~70% around 14H (2H pm), and stays at this level for many hours (4-5hours ~), i think it's not a problem with our battery, but a dysfunction of the sensor battery, which shows wrong data =/
By the way, that problem doesn't appear every day, for example, today my battery has that level : 83% (15h43), so today it has a good level.
Since i have flash that ROM : http://forum.xda-developers.com/showthread.php?t=521941, with radio 1.13.25.24, i have less less issues with my battery, it's more stable!
That's all, hope that helps you.
Ok guys, I've made a few discoveries that I figure I could share with everybody. Maybe you'll find it useful.
Last week I went on a trip and turned off the data connection while I was out of the country. Instead of letting the roaming charges kill me, I was relying on wifi to check emails and browse the web.
I ended up checking emails just as often, because where I worked had wifi AP.
Now, I could usually get 8, maybe 9 hrs out of my battery with moderate use before it's completely empty previously. So I was very surprised to find that with a similar usage pattern, but using wifi instead of EDGE/GPRS I still had 30-50% battery left at the end of 8-9 hours day everyday during the trip. I know data uses a lot of battery, but I always thought wifi drains even more, so that's quite a stunning discovery.
Now, I don't think it was due to wifi draining less than GPRS/EDGE (can't be true), so it must be something else. In trying to figure out what made the difference, I did a bunch of tests after the trip, and this is what I find-
1. Data channel dis-connection / re-connection is BAD
I used to always set my phone to auto-disconnect data channel (EDGE/GPRS) after 5 min of inactivity, in an attempt to save battery. What I found, was keeping the data channel open does NOT actually drain more battery than leaving it off at all. Transmitting data drains battery, but not leaving the channel open. However, disconnecting it, and re-connecting it all the times actually drains quite a bit of battery. I set my phone to check email every 30 minutes, and then there's also the odd weather forecast that needs data channel. In a 9 hrs day, that means channel disconnection + reconnection of about 40 times.
The last couple days I have left my data connection ON all the times, and I actually get more hours out of my battery. My battery used to drop ~ 10-15% per hour with moderate use. By keeping the channel on all the times it's been kept to under 10% per hour!!! I've only tested it for a couple days. I'll report more on it once I get to test it for longer, but the idea that 'keeping data connection off when you're not using it to save battery" seems to be a complete myth. The opposite actually saves battery!!!! And as a bonus, I don't even have to wait for the data channel to connect when I need it!!
2. Recycling the radio is VERY BAD
Everybody knows 3G is a real battery killer. However, similar to EDGE/GPRS, keeping the 3G channel open does NOT drain any more battery than turning it off, or turning on EDGE/GPRS channel. When the data channel is idling, it doesn't matter whether it's on EDGE, GPRS, 3G, or even completely turned off, the battery drain is close to zero in all cases.
Now, you do see a 1.5 - 2 times battery drain with 3G compared to EDGE/GPRS, so I've always turned 3G on only for web browsing or watching YouTube, and use GPRS / EDGE for regular emails update. The thing is though, if you're not transmitting much data (which you won't for regular email update), the difference in battery drain is minimal. SWITCHING between 2G and 3G though, requires a radio power cycle (turn off then back on to switch frequency) and THAT drains a lot of battery!!!
So if you're often switching between 3G and 2G, and you only transmit little data in 2G mode, you might actually be better off keeping it in 3G all the times instead of forcing the radio to power-cycle all the times.
I've tried keeping it in 3G all day long and I noticed minimal increase in battery drain. However, there might be another reason you want to consider - RADIATION. 3G not only drains more battery than 2G, it also transmits at a stronger power than 2G and as a result create more radiation. For that reason, I'm still keeping my phone to 2G for email updates and what not, and switch to 3G only for web browsing. For radiation you may try this thread if you want to read more about it.
3. VGA screen is a REAL battery killer
I do quite a bit of reading on my phone (ebook, on-line magazines etc) and reading ebook was never a battery concern in my days with the Touch (QVGA screen).
That's why I was quite surprised on the Diamond, reading the ebook for 1 hour, with EVERYTHING else turned off (GSM, EDGE, GPRS, 3G, BT, wifi), my battery level went down by 12% in ~1 hour.
The VGA screen drains a lot more battery than the QVGA screen. Now, if you need to use the phone you need to use the screen, there isn't much of a choice. It does make sense, however, that if you're using the screen for a while (like reading ebook) switching from a high brightness level to a lower brightness level.
Oh, and the auto-adjust brightness thing? That doesn't help you save battery at all. This is because it polls the light sensor every 2 sec (default value, but you can change it) and adjust screen brightness accordingly. This mechanism drains battery in itself, and in most cases end up using more battery than keeping the brightness constant at a low to medium level.
The auto-adjust thing is cool, and in theory it sounds like it can save you battery, but unless you constantly set the brightness to max even when you're in a dark environment, disable the auto-adjust and just set it to a constant 50-60% instead.
These are the few things I've noticed and I'm still trying things out, but over the last 2 days I've seen a significant drop in battery drain. I would be lucky to go through a 8-9 hrs day with moderate to heavy use before, the first 2 days I tried this I still had 60% battery left after 5 hrs of moderate use. The Diamond is very weak on battery life so every bit helps! I hope these tips are useful to you!
Thanks for your share
number16 said:
When I'm charging the battery, I also noticed the level went up from 0% to 70% very quickly ... pretty much over 40 min. BatteryStatus shows it's being charged at +600-700mA.
As the battery gets full, the charging is much slower ... BatteryStatus shows it is charging by ~ 100-200mA only.
With the battery level up to 99%, it took almost forever to finally get up to 100%. I think it took at least 20 min.
Click to expand...
Click to collapse
It's exactly what the charging process is supposed to do.
Read more here:
The charge time of most chargers is about 3 hours...
Increasing the charge current does not shorten the charge time by much. Although the voltage peak is reached quicker with higher charge current, the topping charge will take longer.
Some chargers claim to fast-charge a lithium-ion battery in one hour or less. Such a charger eliminates stage 2 and goes directly to 'ready' once the voltage threshold is reached at the end of stage 1. The charge level at this point is about 70%. The topping charge typically takes twice as long as the initial charge.
Click to expand...
Click to collapse
source:batteryuniversity (dot) com
Hey guys,
It would be really nice if people start posting the battery life of their defy on CM7 any build.
Pls mention the build detail and how much do you use.
let me start.
i am getting around 2 days 10-15 hrs on a single charge..
i am using cm7 RC1v2
i listen to music for around 4 hrs, i msg frequently, i take pics,only 2G, wifi for an hour, no gps, no mobile data.
Lets try to keep this thread alive to help ppl who are trying CM7 and wants to know how much they should expect battery life.
Thank you
I m having the latest build july 1 and it charges only till 95............
2g is 6hrs
cm7 beta 6
around 30hs
2h listening to music
1.5h talking
30m gaming
30m web surfing
auto-brightness enabled
wifi/3g constantly on, wifi never sleeps
undervolted:
800/45, 600/30, 300/18
up threshold: 90%
vsel1 when screen is off
vsel2 when battery <20%
wow...that alot of info...thanks..really appreciated..
cmon guys...70+ views but only 2 replies??
I've noticed that if I am busy and I don't have time to play to much with Defy (using it mostly for his basic function = mobile phone) the battery can least over 4 days with moderate use (talk time around 40 minutes). I generally keep it on 2G network mode as the 3G coverage on my current carrier is not so god and I use the internet/data connection on Defy only on demand. The screenshot below was taken on CM7 beta 6.
1 hour usage can drain as much battery as 20 hours standby. So "battery life" can hardly be comparable even with slight difference in usage pattern. Maybe how long 1% battery can last on average is more comparable.
In my case 1% battery can standby 1~2 hours, or use (call, video, game...) 3~7 minutes. I was actually recording battery level/time with pen and paper but not by impression. And I don't notice big differences among roms, including orange, finland, noric, hk/tw, or cm7.
And I noticed that after using the 720p recording patch to record video (in other stock roms, not cm7), battery would be drained at 4% every hour standby.
3 hrs of GPS tracking, screen off, 3G always on:
100% to 70%
Hi !
With rooted froyo (the official one from Orange France), SetvSel to undervolt the proc (vsel3 : 52V @ 1000 MHz, lowering by 2V the others vsel), i could go for more than 26hrs with one charge.
Now with cm7 nightly from 01/06 n°0114 (which by the way works like a charm and was really easy to install even for a noob like me), no undervolting at all, 9hrs drained 35% of the battery (with a more intense use I must recognize), which leads to a little less than 26hrs.
I will try to undervolt it, but I definitely think I will get a better battery saving with cm7 !
It's terrible to see that with some little tweaks, cm7 moto defy beats the stock one.
I consider that I paid moto enough that they can provide these tweaks by default in their product, it doesnt cost much time (in my case less than an hour) and it benefits a lot.
ABC_Universal said:
1 hour usage can drain as much battery as 20 hours standby. So "battery life" can hardly be comparable even with slight difference in usage pattern. Maybe how long 1% battery can last on average is more comparable.
In my case 1% battery can standby 1~2 hours, or use (call, video, game...) 3~7 minutes. I was actually recording battery level/time with pen and paper but not by impression. And I don't notice big differences among roms, including orange, finland, noric, hk/tw, or cm7.
And I noticed that after using the 720p recording patch to record video (in other stock roms, not cm7), battery would be drained at 4% every hour standby.
Click to expand...
Click to collapse
For me 1% battery can standby for 30 mins only
Wi-fi off
2g
cm7-110627-2013-NIGHTLY-Jordan.zip
SoulHunter78 said:
For me 1% battery can standby for 30 mins only
Wi-fi off
2g
cm7-110627-2013-NIGHTLY-Jordan.zip
Click to expand...
Click to collapse
did u wipe battery stats?
if not then do it! download battery calibration app from market and use it.
u can also do it manually in custom recovery..
This is mine. im using CM7RC1
5% battery only 33 minutes
wifi-off
2g network
phone call 5 minutes
stand by
I really need your help??!!!
5% after 30 min from full charge. Wow, check the battery itself, maybe broken
Sent from my MB525 using XDA App
50~60 hours.
sorry for a long post but here is a quick log of my activity using cm7rc1 v1
7:00 am - boot phone with wifi - 99%
9:42 am - wifi off - switch to 3g - 91 % (8% drop - 30min music)
9:56 am - stdby with 3g on - 88%
10:06 am - 5 min gps nav 3g - 85% battery - 36C
10:22 - switch to 2g - 81%
11:37 - 2g stdby -73% - battery - 34C
12:47 - camera-3pics, video 1 min, 2g - 66%
turned off phone reboot to recovery update to cm7 rc1 v2 then reboot
12:58 - 65% (still on 2g)
switching to 3g
13:02 - 3g stdby - 64%
13:11 - maps, couple of messages- 62%
13:40 - 1min call, check emails, (still in 3g) - 49%
2:20 - 3g stdby - 44%
2:29 - 3g gps nav - 39% battery 47C
2:48 - data off - switch to wifi - 38%
this is my moderate use as i haven't played any games yet.
baseband - us tmobile .9
OC in recovery -300/600/1000 vsel 20/40/50
vm heap - 16m (if this would help)
2 widgets for power, 1 widget for clock
auto brightness/ wake with volume control
any tips how to improve battery life?
after i using BatteryCalibration, my battery seems like running well..it drains 3% after full charging in 4hrs30mnt.
phone idle 40%
cell stand by 31%
display 12%
android system 5%
etc...
is it normal now??
F.Ace said:
after i using BatteryCalibration, my battery seems like running well..it drains 3% after full charging in 4hrs30mnt.
phone idle 40%
cell stand by 31%
display 12%
android system 5%
etc...
is it normal now??
Click to expand...
Click to collapse
yes it is completely normal
i m sure now u may get a complete 2 days backup with moderate use on ur defy
salingpusa said:
any tips how to improve battery life?
Click to expand...
Click to collapse
wipe battery stats after flashing a ROM..read few post above to know how to do it..
turnoff wifi,3G,gps,bluetooth and mobile data when u r not using..these consume battery alot!
or else use apps like juicedefender or green battery app to do it automatically..
reduce screen brightness or keep it in auto brightness mode..it will save alot of battery
task killers might help..some people says..but i think it consumes more battery then it gives
avoid using live wallpaper..i know it looks gr8..but its not gud for ur battery
try these and report here..
All the best
my battery uses is not normal
help!!!
the display use too much
sorry for it is chinese version
hope all can identify the icons
adkit said:
my battery uses is not normal
help!!!
the display use too much
sorry for it is chinese version
hope all can identify the icons
Click to expand...
Click to collapse
hmm..many people have problem with display..
its been only 33 mins since last charge..
report back here after few hrs and let us know if the display is still taking max battery or not
still not fixed..
after i use the battery calibration, firstly its good..
but now the battery stats is changing again the position
current position of battery 76%
20h 35m on battery
display 30%
phone idle 24%
android system 11%
cell standby 9%
android OS 5%
etc
(on airplane mode, wifi off (on for 1h), very low brightness)
Hi everyone.
I don't see anyone feeling bad about battery nowadays with new update. I dont see any improvement in mine :O
I need some informations from you, can you tell me voltage phone reaches when it turns off by itself? Its very strange when mine reaches around 40-50% voltage goes down very fast and it turns off around 3.2v...
Who's with good battery?
Tell me,
*phone time on battery
*display on time
*wifi time on
i feel like mine is not good i dont know the reason why.. my friend gets 7 hours of browsing(7hrs display on), and i get around 4... it cant last 5 hours with display on.
-- 30 % brightness, bravia off, sync off, auto rotation on --
I saw on internet some reviews 2 days of heavy use :O how?
I tried wiping batt. stats, and gonna try again after system creates batterystats.bin
i did it twice, but slight improvement...
regards
hope this isnt spam for you.
Hi
I have voted 8-9 hours for casual use at low display brightness 20-30%. Auto brightness is allways activated and using it in a fairly light room might increase your display brightness without you noticing this. Could this be the reason you are experiencing such high battery drain with display on?
Heavy gaming:
3D games like order and chaos and dungeon defender that utilize the Andreno consumes up to 30% per hour, that leaves 3 hours of use. Battery history show an allmost 50/50 between display power usage and the game process power usage. Buildin speaker also consumes allot of power.
FPSE that to my knowledge do not use the GPU but utilizes the CPU 100% consumes around 20% per hour leaving 4-5hours gaming.
Light gaming and casual use.
My daughters using drawing programs, playing angry birds or other light weight kids games plus some webbrowsing and email reading consumes about 12-15% per hour leaving 8-9 hours of use with dispaly on.
If you add speech calls on 3G your times will decrease significantly, this is consuming 20-30% of battery per hour depending on signal strengt. This is my personal observations.
Bravia is allways activated and I thought this was only used when watching movies or looking at pictures in the gallery?
It is interesting to read the SE support app installed and the SE recommendations to improve battery live. They mention that if your display is at max brightness it will not make any noticeable difference if you have bluetooth, wifi, data, sync etc turned on as the screen is consuming sooo much power at max they also recommend to use earphones instead of speaker to improve battery consumption. The rest of the recommendations are well known as to turn everything not needed off. The recommendation I like the most is a daily reboot to improve system performance
I like your review.. I got the same result with 3d gaming... 3 hours, but i never had 8-9 hours even with light usage.. Not playing 3d games..
Max. I get is 5 hours but i dont know how, i fell asleep on entry screen on asphalt 6...
Btw. Did u payed order n chaos i cant find cracked version.
3 hours phone on
40 mins display on
1 hour wifi..
Now on 85 %
Regards
Sent from my LT15i using xda premium
I began to suspect it's from the battery it self, I reversed to the old firmware .145 the battery was the same, never completes a whole day, 19 hours maximum.
I think its battery too... I bought mine with world generic, and flashed uk generic, its same for me... Has anyone thought that somewhere in system is set battery capacity is example 900, i have read it on this forum in x8... So how to investigate it, my battery dies always ~4 hours display... It went once 2 days, and display time of course 4 hours.
Sent from my LT15i using xda premium
shtreber said:
I like your review.. I got the same result with 3d gaming... 3 hours, but i never had 8-9 hours even with light usage.. Not playing 3d games..
Max. I get is 5 hours but i dont know how, i fell asleep on entry screen on asphalt 6...
Btw. Did u payed order n chaos i cant find cracked version.
3 hours phone on
40 mins display on
1 hour wifi..
Now on 85 %
Regards
Sent from my LT15i using xda premium
Click to expand...
Click to collapse
Haha, a nice way of testing it, keeping it running while sleeping :-D 5-6 hours is probably more normal than 8-9 hours, that was when my daughters was using it with a kids drawing program at low light settings, it was not consuming much cpu at no sound was used.
I have bought order and chaos but had shortly installed a cracked version as there were some problems with android marked at the time. I paid for the game but it would not start the download, contacted their support and found a cracked version while waiting for them to fix it ;-)
36 min phone on
36 min display on
Wifi on browsing xda on dolphin
Display dimmed with SE widget
2G coverage
8% battery used
Display consumed 76%
Dolphin consumed 13%
Wifi consumed 5%
[email protected],5Ghz
[email protected]
[email protected]
Running with smartass cpu governor and noop io schedule and Doomkernel v10
I got some interesting stuff... I deleted mine bat. Widget, using battery calibrator i can see percentage, 4.2 v full, 3.75 v 46 %, i played 10 min game, percentage fell down, and now i got 35 %, same voltage... Btw. Stock everything.
And calibrated my battery today... I ll post in few days if i got some improvement, but i dont think so...
And 13 min 300 mhz, but display on all the time? Weird.
29 % 3.72 v... Browsing only
20% 3.708 v... Still browsing
Sent from my LT15i using xda premium
shtreber said:
I got some interesting stuff... I deleted mine bat. Widget, using battery calibrator i can see percentage, 4.2 v full, 3.75 v 46 %, i played 10 min game, percentage fell down, and now i got 35 %, same voltage... Btw. Stock everything.
And calibrated my battery today... I ll post in few days if i got some improvement, but i dont think so...
And 13 min 300 mhz, but display on all the time? Weird.
29 % 3.72 v... Browsing only
20% 3.708 v... Still browsing
Sent from my LT15i using xda premium
Click to expand...
Click to collapse
The batterys voltage will drop allot from 100% to 90% and the voltage decrease will slow down as you are getting closer to 0%. I would guess 3,65 is close to 0%.
The battery % is not calculated from the voltage level but from an internal register in the battery chip that decreases with a value calculated by the battery chip from the exact amount of power used. The battery chip can measure precisly how much power is running to and from the battery.
The android calibration can change this register for example when the battery is getting close to a pre configured safe voltage level, could be 3,65v. It would then reset the register to 0 and the same goes when charging the phone.
If the register show you can have max 5000 units and you are charging the battery and reaches 95% and 4500 units while the voltage show 4,2 which is full, it would then update the register to have 4500 as max level and start to decrese this as power is draining from the battery. If you have 10% left and 450 in the register with voltage at 3,65 it will presume this to be empty and the register would be changed to 0 and battery indicator to 0%. The next charge to 100% should end up at 4150 which would match the exact capacity available for the phone.
The battery will over time slowly degenerate and its capacity will slowly decrease which is one of the reasons the calibration is needed to allways have it show correct battery levels.
The battery is actually not empty at 3,65 but draining it even further will drop the voltage and make the phone crash.
I hope my above explanation makes senses. Had earlier updated and compiled an android kernel battery driver for the old xperia x1 phone. I presume the mechanism for the battery driver in Xperia Arc is the same.
hygge said:
The batterys voltage will drop allot from 100% to 90% and the voltage decrease will slow down as you are getting closer to 0%. I would guess 3,65 is close to 0%.
The battery % is not calculated from the voltage level but from an internal register in the battery chip that decreases with a value calculated by the battery chip from the exact amount of power used. The battery chip can measure precisly how much power is running to and from the battery.
The android calibration can change this register for example when the battery is getting close to a pre configured safe voltage level, could be 3,65v. It would then reset the register to 0 and the same goes when charging the phone.
If the register show you can have max 5000 units and you are charging the battery and reaches 95% and 4950 units while the voltage show 4,2 which is full, it would then update the register to have 4950 as max level and start to decrese this as power is draining from the battery. If you have 10% left and 100 in the register with voltage at 3,65 it will presume this to be empty and the register would be changed to 0 and battery indicator to 0%. The next charge to 100% should end up at 4850 which would match the exact capacity available for the phone.
The battery will over time slowly degenerate and its capacity will slowly decrease which is one of the reasons the calibration is needed to allways have it show correct battery levels.
The battery is actually not empty at 3,65 but draining it even further will drop the voltage and make the phone crash.
I hope my above explanation makes senses. Had earlier updated and compiled an android kernel battery driver for the old xperia x1 phone. I presume the mechanism for the battery driver in Xperia Arc is the same.
Click to expand...
Click to collapse
more results,
3.65v at 15%
3.6 at 8%
and since it passed 8, it goes down to ~3.25v but mine doesnt crash. it nicely turns off. 5 hours 35 mins display(yay.. improvement.), wifi time i cant remember, but 9+ hours. 30% brightness,around 30 mins total gaming, something like angry birds. 30% brightness. and like 20 mins 3g internet.
shtreber said:
more results,
3.65v at 15%
3.6 at 8%
and since it passed 8, it goes down to ~3.25v but mine doesnt crash. it nicely turns off. 5 hours 35 mins display(yay.. improvement.), wifi time i cant remember, but 9+ hours. 30% brightness,around 30 mins total gaming, something like angry birds. 30% brightness. and like 20 mins 3g internet.
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Interesting, the old xperia x1 could not handle levels below 3,65 6i
Been trying to improve my battery life and I found this in my battery stats:
Cell standby: 41% (7% of time without a signal)
Phone idle: 35%
Android system: 10%
com.cooliris.media: 6% (Used to be default gallery, but I unintalled it)
Dialer: 6%
Display 3%
Is it normal for cell standby and phone idle to take up so much of the battery?
Yes. Cell takes up a lot of battery, especially if you are getting a low signal
Sent from my R800x using XDA
If you use an app to reduce your minimum cpu mhz, the idle should take a bit less of battery
sashake said:
If you use an app to reduce your minimum cpu mhz, the idle should take a bit less of battery
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I already underclock my CPU. from 1GHz to 900Mhz, then at 30% battery life, goes down to 768Mhz, at 10% it only goes at 368Mhz.
And when the screen is off, it only goes at 245Mhz.
Masters2150 said:
I already underclock my CPU. from 1GHz to 900Mhz, then at 30% battery life, goes down to 768Mhz, at 10% it only goes at 368Mhz.
And when the screen is off, it only goes at 245Mhz.
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Are you using an app to get those results?
i work in an area where the signal coverage is really bad and when i leave with full battery in the morning, i get home even with ~50% only. the battery is basically killed just because it keeps searching for a network
Running CM10 Wild into the Night.
If I let the phone sit without touching it, I get an average drain rate of about 10% per hour, lasting me about 10 hours on a full charge. However, the battery decides to have a field day as soon as I perform the occasional texting and web browsing.
As shown by the screenshot, culprit is the screen. However I have the brightness set way down (about 1/4 from the bottom) and the phone goes to deep sleep 70-80%. According to Gsam battery monitor, the screen uses about 60% of battery with only around 52min of on-time during the 5 hours that a full charge lasted.
Something is definitely up. When I was running stock Touchwiz, AndroidOS used to be the battery hogger. But now the screen has taken over the crown on CM10.
Screen will always use the most unless you neve use the phone. How old is your battery? Does it spin?
Sent from my SPH-L900 using Tapatalk 2
That sounds like you need a new battery. 52 minutes is no
Where near long enough
. or possibly with the screen on some app is running the CPU full speed
use CPU spy and leave the screen on indefinitely after unplugging it from the charger at full battery, and see if the highest CPU state is being used for the entire screen on time after you unplug it.