Samsung Galaxy S II i9100 Original OEM Battery - Non-Retail Packaging - Black This 1650mAh Samsung EB-F1A2GBU will give your phone the power it needs for optimal performance and reliable long lasting power. Looking for a replacement or back-up battery for your Samsung Galaxy S II i9100 This slim battery is a great back-up or replacement in case you lose or damage your old battery. Compatible with the Samsung Galaxy S II i9100 phone model