I CAREFULLY replaced my prs 650 battery from 99 using the instructions on youtube and the battery was quite good. But this wasn't the only problem that I had. The battery kept on draining and when it wasn't drained, it was always on. I finally took it apart again using the battery replacement instructions and cleaned all around the slider on switch. It 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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