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Internal memory for books I'm meaning to read or are reading, and SD-card for a collection of books already read and downloaded news-feeds. If I want to reread a book I just pop in the SD-card.
I was planning on putting everything on an SD-card till I read about battery-draining. Exactly how bad is the battery draining anyway, does it mean it's still using the battery while not turning pages or how does it work?
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