I have had the 650 for about 6 weeks now and have had an issue with the battery. About 2 weeks ago it went from 4 bars to 2 in a day (when ordinarily it would have stayed on 4 or dropped to 3). I recharged via a plug charger and the same thing happened. I was a bit perplexed and decided to power the device on and off again (I usually just go into sleep mode). And this has fixed the problem, it now works as it did before. I can only presume that the processor was working while in the sleep mode and this was causing the battery drain. By shutting down and 'rebooting' the device it was no longer having to process the errant thread. Its all guesswork though.
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