On the kindle fire I don't know if there is a "charging mode." Anyway, it seems easier for now to use the wireless capablities of calibre to send my books to the fire instead of the usb cable. Since I was able to install google play on my kindle I downloaded the demo version of calibre companion and just sent a book that way. Still it would nice to be able to transfer books via usb in case the internet is down for whatever reason.
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