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I need information about which applications or hardware features discharge the battery. Built-in Android option for this doesn't fit because not all devices have it. Also it would be a great advantage if the solution would send statistics via email.

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"Is there an app for X?" questions are off-topc per FAQ. That's why I rephrased your question. – Flow♦ Aug 31 '12 at 10:51
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As far as I know all android devices have these statistics. If for some reason a device doesn't have them (old android or wierd manufacturer), then there is a good chance that the app can't get the information either Apps can only access what android provides, if android doesn't record it they can't get it either - except root apps but if you go as far as rooting than you might as well install a rom that has android statistics. It is possible that you just can't find the android statistics beacuse they are not in the ussual place, try searching the phone a bit more. – Mihic Aug 31 '12 at 12:47
@Mihic unfortunately, some of the most important battery stats (wakelocks and some more) have been removed with Gingerbread ;( – Izzy Sep 5 '12 at 6:52

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You could take a look at SystemPanel1 or System Tuner2. Both let you monitor your ressource consumption (not only battery), and (at least in their respective Pro versions) also offer to do so in background, collecting data for later evaluation. System Tuner2 also offers a bunch of nice widgets3 for your homescreen, if you need to watch things for a while.

SystemPanel SystemTuner SystemTuner widgets

EDIT:

After seeing Mihic's comment above, I noticed I missed another important point: While up to Froyo, "dialing" the magic number *#*#4636#*#* brought up a nice system menu (it still does that part) including many battery stats, the latter (battery stats) have been removed since Gingerbread. If your device is rooted, BetterBatteryStats can bring those back -- and do a great deal to help you identifying battery hogs:

BetterBatteryStats: Deepsleep BetterBatteryStats: Partial Wakelocks

These two screenshots show you the most important information BetterBatteryStats provides: Which apps used the most battery power while the device tried to sleep3 -- and those who kept the device awake4, preventing DeepSleep and such "PowerSave Mode". Just helped me getting 20% more battery out of my device ;)

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