Seidio.com just released a new 1750mAh Slim Extended Life Battery. It is physically the same size as the stock 1520 mAh battery but is supposed to yield an extra 10-15% battery life throughout the day. Since it is the same physical size as the stock battery there is no added bulk or need for a replacement back for your phone. In my personal experience the stock battery does perform very well in my Sensation but I do still have to connect it to a charger at least a couple of times to make it through the day.
So I’m looking forward to trying this out. Do you feel that $50 is a fair price for that extra 10-15% in battery life?