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I don't know the reader, but I do have one other suggestion to consider (I also second the calibration comment).
I know that many folks have no problem with USB/Computer connections, but I can report that it can be a problem in some cases. The issue appears to be that some computers do not put out sufficient power to charge via USB. This seems to really confuse the reader. When I attach it to the computer to download books, the reader thinks its also getting charged. For the next charge cycle or two, the reader reports a low charge after only a little usage.
I have had this problem with two different readers (Bookeen, Kindle) hooked to a couple of different Dell computers. It does fix itself over time. However, I've eliminated the problem by making sure I don't leave the book connected to the computer for any lengthy (1 hour or more) time period. Also, I always charge via the wall outlet and not the computer.
With this approach I never have a battery life problem. However, I occasionally forget to unplug the reader from the computer and I have a reoccurrence of the charging issue.
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