Battery-King Battery for HTC HD2, Touch HD 2, T8585, Firestone Leo - Li-Ion replaces 35H00128-00M BA S400 BB81100 - 1400 mAh (Electronics)
I have the battery actually "only" bought as a reserve for the older battery of HD2. In the beginning I had a further 1.5-day period. After 3 full charge cycles, I have now but a luxurious battery life of 3 days from 100% to 9%. I did not expect