Seidio 3200mah battery I got this battery about two weeks ago. The battery performs much better after the break in of 5-7 charges. This morning will be the 3rd day without a charge. It is still showing 1/4 of the battery left. That's with these changes: candle light turned off, no backlight time out, 1 minute display time out, and email check every 15 min. I havent been killing programs either. Same usage as before, but no miday, driving, or early evening recharge like i was used to doing with the stock batt. The only drawback is that it looks like one of them Sears car top carriers on the back of my Q. Its HUGE! (picture attached) Strangley, It does feel better in the hand. It fills that gap between the Q and the palm. It still fits in my car cradle. I had to dremmel the cradle alittle to get the car charging chord to fit, This battery definately has the power for the long haul if you dont mind the added size and weight. I think the 2100mah is slightly thinner but will still protude out the back. Now if they could just sqeeze all that power into the stock battery it would be perfect.