Hmmmm. Sorry you have had a bad experience, but I'm wondering what your motivation here is. Many including myself have had no problems or issues with our Sony Readers and in fact I'm seriously looking at adding the Sony 900.
There can be issues in charging from some machines/USB ports. Maybe that is the issue and it is being discharged while you have it plugged in to your computer. You really need to explore the suggestions and options provided by the good members of this forum.
Hope things get better real soon.