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 and I am of course very happy with this purchase. To rate it can: To use comes with me a Android 4.1.2 AOKP on Cyanogen Mod base with tytung 2.6.32 kernel. I use mostly only 2G connections, home WLAN. Datensync and Autorotate is on, Bluetooth and GPS is made predominantly.