Speaking from experience looking for a replacement battery for my Gen3, most of the li-polymer batteries for cell phone, pda's, and book readers have the same specs (3.7V, 1000mAh) and look similar in the photos but are all different sizes and have different connectors. I can't find the picture that Robertb posted earlier and I can't pop the back off of my Pocket Pro at the moment, but somewhere on the battery there should be a 6 digit number similar to 503456 (This is the number off of my cybook battery). This number tells you what physical size the battery is - in the cybook's case the battery is 5mm deep x 34mm wide x 56mm long. Unfortunately, even if you can find a battery that matches the dimensions you are looking for, it's unlikely that the connector will be correct. It seems like every device has a different connector!
Astak's price of $14.99 for a replacement battery isn't bad. Bookeen charges $40.00 for the Gen3's replacement batteries (that and the $30.00 shipping fee is one of the reasons I decided to purchase a Pocket Pro).
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