An official Samsung Galaxy S II I9100 accessory that fits to your Samsung Galaxy S II and provides additional power.

Essentially an extended battery, this power pack for the Samsung Galaxy S II has a 1300mAh capacity. Add this to the 1650mAh standard battery in the device already that gives 2950mAh.

This power pack fits around your I9100 and extends the talktime. It does make the device physically thicker, but it also acts as a protective casing.

The phone can be used without restriction but adds the extra power too, so you can work away from a fixed power source for longer - perfect for the most demanding of users.
LED Battery Status:
Capacity 0 ~ 5 % : LED Blinking
Capacity 5 ~ 20 % : RED
Capacity 20 ~ 80 % : GREEN
Capacity 80 ~ 100 % : BLUE

Extended time:
Talk time: 7.66h(2G) / 4h(3G) –TBD