Yesterday in the mail, I received said item which I purchaed on Ebay. The battery worked fine yesterday and it didn't indicated low. After plugging it in while I was at work (9 hours), it keeps shutting off after 3-5 seconds with the low battery sign on. It came with an AC adapter, but I am wondering if it is the right one for the scanner or just one that looks like it should work, because it won't stay on while plugged in either. Or .... maybe the battery is just dead...... any advice?