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It's possible that there's a problem with your pdf file that's causing the reader to hang. I've never had good luck with pdfs myself. Calibre is a quick and easy way to convert file types and will also help manage your library and automate making collections on your reader.
I don't worry too much about the fact that the battery charges when I connect my reader. I tend to put a lot of books on all at once and then read them, so by the time I'm ready to connect, it's due for a charge anyway. I also don't worry about how long my reader charges. I tend to recharge when it gets down to one or two bars and I tend to charge overnight, especially if I'm using a wall plug. These batteries are rated for thousands of charge cycles, so even if you charged it every day, the battery would last for several years.
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