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Help Unexplained Battery Drain

This is not something that happens frequently but the fact that it happens at all is annoying ...

I'll set my phone's alarm to wake me in the morning, will put the phone into airplane mode and go to sleep. By the time morning comes around the battery has died and therefore no alarm went off. Before going to bed the battery has had at least 50% charge - easily enough for it to get though the night in airplane mode.

I'm thinking that there is some rogue app hammering the CPU in the background but as the battery has died I'm unable to use the feature that checks whats been using the battery.

Has anyone else experienced this? I'm running the official 2.1 software.
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