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  1. #1
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    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.

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  3. #2
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    I have a A500

    Modell-ID: A500
    so what?
    I really don't know what you mean

  4. #3
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    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.

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    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.

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    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

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    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.

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    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.

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    Oh, I'm sorry. I misunderstood.

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    Quote Originally Posted by pentool View Post
    Oh, I'm sorry. I misunderstood.

    No worries.

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    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.


 
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