I downgrade my device's rom to WM5. Normally, my device can live for 2 days with 1-2hours of call (using XP-02 battery). After using batti 2.4, I found that my device will shutdown at 3.75V(at that time, battery drain to 0%). Windows will show an alert then shutting off the device. At this time I can not power on my device by the power button. Now i do a cheat that i see in this web site and found that my device can power on(without charge)and last more than 1 and a half of day with 1 hour calling. Totally it can take more than 3 days with over 3 hours talking. The cheat I do is as bellow:
Locate the pin next to the + or - on your battery, use a tape to make it do not contact to the phone when you put the battery to the phone. Then press the power button, you device will power on (althought it showed the battery drain to 0%). Now the battery status do not show any value, but your device will working probably and longer than you thought. So, anybody help to make any change in registry (i think) to ignore the shutdown alert of windown(when the battery drain to 0%) and keep the device continue working? Or change the shutting down voltage to 3.55V (not 3.75V) to increase the battery life for atom exec(Because I see the voltage of my battery decrease to 3.55V before it turn off)? The overdischarge for 3.7 lion battery is 2.75V. So I think it is not affect my battery life by using this cheat.
Hope to receive any support from you.
Thanks for reading
I use the extended battery (htc original) which is brand new, I just installed the latest android 2.2 with Hastarin R8.5.3+ with JDMS 1.6.2 Ultimate
the problem I have is the battery drain in standby mode, it chargec 100% and in 1h I lose 35% that's with the bt off, gps off and only wifi on.
however when I set the phone to Flight Mode, the battery lasts as good as windows!
SETcpu is on Power Saver mode but battery still drains fast, all other tasks killed.
now when it says 75% left on android, I go to windows and it shows 98% is it just that android not reading it correct?!
this is the extended battery it should last at least a whole day but the draining is crazy but I think android isn't reading the battery correctly.
in android standby (wifi and phone only) I am losing 5% per hour, in windows (with everything on) I lose 1% per hour or less.
Sir like mention in the Android section; the android builds have problems, not 100% compatible with Extended Battery's.
Let's collect some statistics regarding battery discharge rate when tablet suppose to be asleep, like overnight.
I'll start:
ROM - TnT lite 4.2, WiFi On, BT Off, in 10 hours 14% charge drop - 1.4% per hour.
with WiFi Off - around 1% per hour.
I was killing all apps on background before going asleep but this does not affect discharge rate too much, maybe 0.2% and as well might be just measuring error.
What is your tablet's discharge rate?
vegan 5.1.1 clean install, no additional kernel/OC tweaks
lost 30% over 6.5hr of sleep. battery usage shows very little idle time and alot of "android system". i wonder if that means something stayed awake and kept the tab from sleeping or what. o, and wifi was on and awake the whole time too
anyway to put this thing to sleep and last a few days like my HTC mytouch3g when i put it into airplane mode? that phone would drop to the lowest clock speed and sleep with very little battery drain
atb1183 said:
vegan 5.1.1 clean install, no additional kernel/OC tweaks
lost 30% over 6.5hr of sleep. battery usage shows very little idle time and alot of "android system". i wonder if that means something stayed awake and kept the tab from sleeping or what. o, and wifi was on and awake the whole time too
anyway to put this thing to sleep and last a few days like my HTC mytouch3g when i put it into airplane mode? that phone would drop to the lowest clock speed and sleep with very little battery drain
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Click to collapse
Why not just power it all the way off? Deep sleep is essentially Off anyway, minus the bootup time.
Cold start is about 50 seconds. When starting from standby - almost instant.
It would be nice if our GTablet can go into standby and don't lose charge with that rate.
Vlad_z said:
Cold start is about 50 seconds. When starting from standby - almost instant.
It would be nice if our GTablet can go into standby and don't lose charge with that rate.
Click to expand...
Click to collapse
Nice, but impossible. Just plug it in overnight. If you want it "always on" you can expect about 16 hours of standby with 4-6 hours of use mixed in. I'm so used to daily charging it doesn't even bother me anymore. Just really happy this thing goes all day on wifi without deep sleep... good enough.
Well, I am inclined to think that this is a software problem (Android OS). Xoom with HC does ok when in sleep mode. Someone say 3%-4% overnight.
Vlad_z said:
Well, I am inclined to think that this is a software problem (Android OS). Xoom with HC does ok when in sleep mode. Someone say 3%-4% overnight.
Click to expand...
Click to collapse
Only way it would do that is deep sleep. As in, nearly off - everything powered down except ram, CPU halted.
That's essentially the same as putting your laptop to sleep, vs power down.
The GTab's deep sleep sucks. Not sure what's wrong with it, but it's below the level of android. So it could be a firmware issue. I'm happy with the 2-3% per hour drain when "on" but screen off, connected to wifi, able to generate alerts and alarms.
So, my interest was piqued
I use pershoot's UV/OC kernel, keep wifi on all the time, and use softlocker to make sure my gtab *never* deep sleeps. This is on Vegantab-ginger.
I installed batterymonitor widget, and am collecting data.
First interesting tidbit, my "screen off, but wifi on/not really asleep" power drain is 125mA
Given the 3650mAH rating of the battery, that gives me 29.2 hours total standby time in this state.
Working backwards, that's a drain of just under 3% per hour.
You're actually seeing MUCH WORSE than that, at 4.6% per hour (30% over 6.5 hours) so I agree with you, your software is doing something very bad. You can get nearly 50% better battery life by using gingerbread, pershoot's kernel, and keeping it from going into deep sleep
my tablet lose near 10 %
n21klin said:
my tablet lose near 10 %
Click to expand...
Click to collapse
Any more details? Number of hours on standby? ROM version? Was it deep sleeping (wifi off, clock/time not updated until a few seconds after power on?)
Assuming 8 hours or so sleeping, this is much closer to the expected 1.125%/hour discharge rate for "deep" sleep, or about 90 hours total on deep sleep standby.
schettj said:
Any more details? Number of hours on standby? ROM version? Was it deep sleeping (wifi off, clock/time not updated until a few seconds after power on?)
Assuming 8 hours or so sleeping, this is much closer to the expected 1.125%/hour discharge rate for "deep" sleep, or about 90 hours total on deep sleep standby.
Click to expand...
Click to collapse
if that was indeed true (that you manage to get your tab to sleep for 8 hrs and only losing 10%) then i want whatever you got. I want my tab to be able to sleep for 3-4 days, even if it mean having to settle for JUST 1.0 Ghz
The lowest I've seen so far in batterymonitor widget is ~108ma draw (screen off, 214mhz clock, wifi off)... if the thing goes into "deep sleep" then batterymonitor (and everything else) stops dead, since the cpu is halted - you'd need to poke it inside to see what the load is when deep sleeping.
108mA gets you to 33 hours. To get to 72 hours you need to get the load down to about 50mA. That's the budget to keep the ram chips powered, and the on/off buttons
Battery drain with ext3 partition and S2E?
Is there a perfect way to check what's draining your battery? Recently I've been noticing that my battery consumes almost 20% of charge during night, whereas it used to only eat about 5% in my previous installation of CM7.
First install of CM 7.0.3 - Good battery life, night drain is only about 5-8%.
Second install of CM 7.0.3 - Worse battery life, night drain is about 25%.
The main difference in the second install in that I have made an ext3 partition in the sd card and I am using S2E and have moved some apps to the sd card. Will this consume more battery?
Had a look at the battery history in spare parts, and I see that the partial wake usage by Maps and K9 mail topped the list. Uninstalled both to see it they were the issue. I have Juice defender plus where I have configured data off hours from 12:30 am to 6 am. Still it drinks battery. Any thoughts?
This is very weird problem on my Memo Pad 8 (ME180A).
I charded device for 8-9 hours after completely turn off the power (not standy/sleep mode).
Then I've not used for about 10 days. (I'm a casual tablet user and usually turn the power off when not in use)
A few days ago I turn on the power to use it.
But the battery level is 77%.
How come the device uses 23% battery without power on.
I asked ASUS tech support they said it is normal because clock uses battery to keep time.
I understand but it still doesn't make sense 23% usage for clock.
Is this from firmware problem?
I have Samsung Galaxy Tab 2 7 and it barely uses battery even in standy mode.
Anyone has same issue?
How can I fix this?
Thank you in advance.
+++++++++++++++++ UPDATE ++++++++++++++++++
The battery doesn't drain, but not fully charged.
Found review mentioning same problem.
He said battery is not fully charged, only up to 70-80%..
He recommended delete system cache and factory reset.
Not normal
I have the same tab. After it fully charged the battery goes down %5-10 in a couple of hours in the standby mode. There's something wrong with this Asus.
pnaralove said:
This is very weird problem on my Memo Pad 8 (ME180A).
I charded device for 8-9 hours after completely turn off the power (not standy/sleep mode).
Then I've not used for about 10 days. (I'm a casual tablet user and usually turn the power off when not in use)
A few days ago I turn on the power to use it.
But the battery level is 77%.
How come the device uses 23% battery without power on.
I asked ASUS tech support they said it is normal because clock uses battery to keep time.
I understand but it still doesn't make sense 23% usage for clock.
Is this from firmware problem?
I have Samsung Galaxy Tab 2 7 and it barely uses battery even in standy mode.
Anyone has same issue?
How can I fix this?
Thank you in advance.
+++++++++++++++++ UPDATE ++++++++++++++++++
The battery doesn't drain, but not fully charged.
Found review mentioning same problem.
He said battery is not fully charged, only up to 70-80%..
He recommended delete system cache and factory reset.
Click to expand...
Click to collapse
Same to me with the same tab. After charging it 8 hours for the first time, the battery goes down about 5-6% per hour without doing anything
meteay said:
I have the same tab. After it fully charged the battery goes down %5-10 in a couple of hours in the standby mode. There's something wrong with this Asus.
Click to expand...
Click to collapse
Hi, I found out that my Mate 20 Pro batteey isn't as solid as advertised. The battery keep draining in standby mode. Yesterday, it dropped 9% in 8 hours of standby mode with WiFi on. However, the first few days the battery is very great but after 10 days of usage the battery performance dropped a lot ?. May I know is the AI allocation of power based on my usage pattern or the battery is faulty?
Looks like a rogue app...check the battery usage stats or install AccuBatttery to get full details.
Might have to restart in Safe mode to confirm it's an app.
Standby with Wi-Fi should be below 1%/hr unless some background activity goes nuts on you.
Try restarting the phone, i had the issue at some point, the switch from auto app management to manual, keeping just the apps i want. After the recent update(153) i switched back to auto. There is some issue with the app management, cause sometimes i lose just 1-2% of battery during the night, but sometimes 5-7%. Now i get an avarage of 36h+ of usage, and if not charging at 30-40% i could get more.
From brand new, my mate 20 pro drains about 12-13% if left overnight, also thought that was pretty bad