I recently had a case where the book database update notification (the spinny circle thing in the top-left of the notification area) was on continuously and battery disappeared alarmingly quickly. A reboot of the reader "fixed" it, and I haven't had a battery life problem since (nor had I had a problem prior to that).
My T1 is rooted, but I have no idea if this contributed to the problem.
Cheers,
Simon.
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