Cell standby battery issue - I think I may be on to something
Ok so apparently alot of us have an issue with cell standby draining our batteries. Well I was digging around my A500 today and discovered something pretty interesting. I don't actually have an A500. I have an A501. This is the version that is slated to go to AT&T and has the 3G radio.
-Go into your settings menu
-Click about tablet
-Click device information
-Fifth one down is your model ID
So I am guessing this may have something to do with why we are getting battery drain from cell standby.
05-01-2011 03:27 PM
I have a A500
I really don't know what you mean
Mine is a Model ID A501. It is supposed to be an A500.
The A501 is the version of the A500 that is going to AT&T and will be on their 3G/4G network. Which means it has the 3G/4G radio. Which may explain the cell standby battery drain.
Good thought... mine is a 500 though and still has the issue. Something that isn't physically there can't drain the battery, so its probably just a misnamed process from the CPU... especially since airplane mode doesn't fix it.
Okay, but that was kind of confusing because you wrote you have an A501
So still, my Model ID is right, but I also got that battery issue
As I posted on another thread:
I don't seem to have any battery drainage issue. Before I gone to bed, I put the tablet into Airplane mode and I wrote down my battery level: 45%. After I woke up after 6.5 hours, I looked at it. The battery level was still spot on 45%.
I could be wrong, but the reason you guys may experience this issue because of a setting. If you go into Settings > Wireless & networks > Wi-Fi settings > Wi-Fi disconnect policy. Make sure it is set to "When screen turns off".
This way when the device goes to sleep, the screen turns off, and so, Wi-Fi shuts off as well, hence no drainage.
pentool: This isn't a wifi issue. This is a battery drain caused by cell standby. This should not be an issue with a wifi only tablet.
Oh, I'm sorry. I misunderstood.
Originally Posted by pentool
I don't know, though, if it really even matters that much.
I was playing with the tablet for a little over an hour, and the battery life went from 100% to 90%. 12% of this drop was Cell Standby, which basically means that Cell Standby accounts for about 1.2% of total battery loss per hour.
Then, I had my tablet with the screen off for over 2 hours. Checked the battery, and it was still at 90%, with 12% still being Cell Standby. (No change in distribution of battery loss). During the down-time, the unit was still syncing with GMail and E-Mail, as I heard the notifications and when I turned it on, saw the notifications.
If Cell Standby was really happening, it would continue to drain the battery at about 1.2% per hour. I should have seen a 2% drop at least over the 2 hours it was dim, but I didn't... Even though I continued getting notifications of email.
Last edited by dan776; 05-01-2011 at 06:10 PM.