Just convert them with calibre. It usually takes about 7 seconds to convert each book for me, and if you leave it running overnight you can convert hundreds without having to pay any attention to it whatsoever.
Although if you bought them from the Kindle Store, you can't read them with anything but a registered Amazon device. Unless you use deDRM applications, which, if you own the books, are arguably legal under Fair Use Policy (depending on who you ask.) To find out more, google "apprentice alf"
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