My S3 I have been going on for more than two years (Oct 2012) and in the spring was running so slowly the battery limp - that a new was needed. The Mumbi saw the beginning of a very interesting, especially because it is greater to 300 mA compared to the standard battery of Samsung. Priced the current supplier is very good about it, leistungstechnisch also. With consistent and efficient charging can I get a hard day's work with my SmartWatch. This means: From 8 to 11 clock clock in the evening through Bluetooth, WLAN and GPS on, this in CM11 (root) a srtromsparende settings for the CPU, ie in standby lowest clock, in use highest for best performance. I'm really impressed by the performance and at this price it's a great deal - recommended!