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It shouldn't run down overnight like that if you're not using it. Something is eating the battery or the battery is faulty. Take a look under seetings/applications to see whats running. There are apps available that list this stuff and allow you to kill the errant processes.
Also you can install an app to enforce deep sleep when it's in standby. Deep Sleep Battery Saver is good. But you shouldn't need to do that.
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