The unit will shut completely off when the battery is out. I got all the way down to no bars and still had a day and a half of reading, possibly 400-500 pages until the unti finally shut down.
I didn't loose any books, simply plugged in the wall charger and continued reading.
I am still, however, having problems with my battery life. It will only last 7 days, not two weeks. I mean from full charge to cutting off.
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