I have had a PRS-650 for approximately 20 months. After using it pretty regularly over the past year and a half, I left it unused for about two months. When I picked it up again, the battery was dead and the reader would work only when plugged in to the computer.
I CAREFULLY replaced my PRS-650 battery with one from 99 using the instructions on youtube and the battery is quite good. It's important to know that the silver "ribbon" running around the bottom and side of the case has hooks that point up on the side and that therefore you have to slide the ribbon down when removing it. The top ribbon doe snot remove and therefore you don't even have to unscrew the it. The back should be slid out because it also kindof hooks into the inner shield.
Anyway this wasn't the only problem that I had. The new battery kept on draining and when it wasn't drained, the 650 was always on going on or askng me if I wanted to shut it off. I finally took it apart again using the battery replacement instructions and cleaned all around the slider switch using electronic cleaning spray, a pointed qtip and compressed air. The slider is attached to a plastic slider inside the reader that is attached by the tiniest piece of plastic to a third slider. (An electronic version of a set of gears?) The e-reader then charges correctly and works. But I've had to do this twice now.
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