Diablo - what if it is fully charged and you don't connect it to a PC? How long does it last then?
Also, just to be sure, you guys aren't keeping your Readers in a cold place are you? For example I went on a trip and I kept the Reader in my bag in the trunk on the way there. After a 6 hour drive with it being 35 degrees out, my Reader's battery was depleted, cold really messes with batteries and drains them.