Battery is 9 cell, 7200 mAh, which is a huge boost from the 3 cell, 2200 mAh battery that came with my Wind. I've only had it for about a week, but I am getting about 6-7 hours of life out of the battery, depending on what I am doing (wireless off = longer battery life). I used it recently on a flight from Houston to NYC and after about 3 hours of movies, I still had 65% battery life remaining. This battery is definitely a must have if your Wind came with only a 3 cell battery as mine did.
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