I have also a strange problem. After my second charge I read like a 100 pages but my indicater is two bars down. I connected it to my computer many times and every time just as long as I was tranferring books to the reader. I don't know if transferring through the USB takes quite some power. I know this is the case with many devices that I have. Even the ones that charge through USB.
I will keep my eye one it but sending it back is no option since I'm in The Netherlands. In the worst case I just replace the battery myself.