Search for a non-existent string from the home page - eg "ddddddddd". If it comes back and says "X items unindexed", then the indexing process has got stuck. If it does say that, select that link and select it, and it'll show you which item is causing the problem. Delete it, and re-add it.
Also, WiFi will drain the battery even with the Kindle "switched off". Turn the wireless off except when you actually want to use it.
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