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it could just be a bad battery, with an inaccurate charge indicator.
but to eliminate as many other factors as possible try setting it to never sleep, set light to minimum , disable wifi , and also remove all books, and remove the cover.
then if you can have it somewhere handy for spot checks and start it off at 100 at start of day, so you can check battery % every hour or so - see what results you get.
if the battery is bad you will see a steep % fall at some stage, because some cells cannot hold a charge.
a bad battery will often appear to charge ok and show 100% charge, but fail to hold it for long
OTOH if its looking good after a couple of days like that, then add back in other factors, one at a time...
in most countries and with most retailers or even with ebay, you can return within 14 days for a full refund if not happy, so if you've only had it a week...
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