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So I formatted my phone today. I have not used it, and it was at 100% this morning. No apps installed, the screen was only on for about 10 minutes. Yet when I go to check it now, about 12 hours later, its battery is at 13%. I got a new battery a few days ago, so the battery isn't worn out. My phone is a myTouch 4G from t-mobile. My android version on it is 2.3.4

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You can install BetterBatteryStats (from Play Store or from XDA, the latter is free) and see which is causing this.

If you're running the phone without a SIM card this might also be the reason:

Some phones aren't tested well if there's no SIM inserted (my old Xperia X8 is such a phone for example).

Narrow it down this way:

  • Switch the phone to airplane mode (switches wifi/bluetooth/gsm off)
  • Then re-enable wifi (plus maybe bluetooth) again. Just leave it for a while and see if it's better now.
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  • I am running it with a SIM card, and need my wifi and stuff one.
    – Jon
    Commented Aug 10, 2012 at 3:40

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