why does this matter for ebooks? Once they are in your machine, the ereader won't suck your battery dry for reading them.
what sucks a battery dry is networking. When I want to save battery I simply turn on "airplane mode" so that all networking is down. I also turn off most user apps, leaving just the reader and some multimedia playing in the background. Playing music locally doesn't matter. It's nuts what Apple is doing with the cloud thing: downloading your songs on the fly?... pffft
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