My Prs-T1 has actually turned back on again or not entered sleep mode (due to the cover touching it I think). My PRS-350 definitely drains while in sleep mode. It is my reader for on the bus and it will not be used for days, at some point it will turn itself off completely, and on opening the book, I have noted it is down by one bar.
The eink screen does not drain the power, and the 350 has no wireless, so I assume (perhaps wrongly) that it is still strobing for screen input if when it does not act on it.
My PRS 600 will drain completely in four days if in sleep mode, but I have an SD card in that one which doesn't help. Shutting it down it does not seem to drain.
Helen
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