Making progress on my Sony ebook reader woes

As I lamented earlier, my beloved Sony 505 ebook reader had slipped into a coma. It had refused to turn on, and I suspected that its battery was no longer able to take a charge. After a week of ignoring the problem I decided to plug it in and charge it again. I left it plugged in all night. In the morning, it actually turned on! I cleared out a couple of ebooks, suspecting that maybe I had filled up its memory. I have yet to try plugging it into the library management software on my computer ...