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When I had my PRS-600 it usually lasted for a couple of thousand pages, and with the size font I had to use about x3 times that page turns. That was usually in not too many days (less than a week), so I can't say how long ot lasted in time.
I did a full power-off every night and when the reader was to be unused for a few hours. When keeping on standby I could see it loosing charge much quicker.
I did not keep lots of books on the reader, and I have since learned that if you do that full power-off can be a PIA, since it takes forever to start it up again... (and probablu use lots of power during startup as well)
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