Whitewolf,

You don't lose your Kindle library when your battery goes flat. I have 'free' books in my kindle I downloaded in 2011 - they don't expire.

If you think anything is missing from your Kindle, go to Amazon.com, roll over 'Accounts and Lists', look down the right-hand column and click on 'Your content and Devices.' You'll have to sign in to get access, but you will find a list of every Kindle book you've bought, regardless of price. (That's the only way I've found to delete a Kindle book.)

All the best,

Cliff