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Hi, as written above, it could be due to the higher ram specification of PRS650. Since the time I have got advices above, I have been shutting down my 650 completely from settings or holding the power button for 3 secs. Battery lasts outstandingly much longer (3 weeks) since then, Obviously, as described, ram capacity of 650 requires more energy than 505 or 500, so we need to shut it down completely. Hope it works for you too.
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