And I need to move them to the Android tablet. Would they use different formats for Kindle books downloaded from Amazon?
What pisses me off - and did the entire time I was in the UK - is that I buy a Kindle book. It's all paid for and in my library, but unless I force it, Kindle does not download it to my device until I want to read it. This is not a problem when you are where you can get a WiFi signal, but in the mountains of Northern Scotland it sucks to finish a book, then realize the next one I want to read did not download like I though it would and I have NOTHING available to read for two days until I get back to civilization! 
Oh - and yeah, I want to spend $$$ a minute to download books while on a cruise. That was the fucking POINT to using the Kindle app and selecting a few dozen books AHEAD of time!
Most of the books currently on the Android tablet are ones I downloaded for my travels and I have already read. I didn't think I needed to make sure the others needed to be downloaded ahead of time. I just hope the WiFi on this old tablet hasn't gone bad. Then I am screwed since all of my real books are currently in storage.
I'll check out calibre and see if that can help.
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