DRM'd books must be loaded either through Sony Reader or Adobe Digital Editions. I've tried loading them through Calibre and it looks like they are there, but then i can't open them.
Also, the kind of batteries these readers have now do not need to be fully discharged; in fact, I've read that doing so is harmful. (I don't know the technical jargon about it but you can search these forums and find the answers; I've read it here multiple places) so don't be afraid to connect to PC.
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