Description:Samsung uses the latest lithium ion battery technology giving you the best performance possible.Samsung batteries deliver the most reliable and long lasting power. Features:Provides good talk and standby time performance!Lithium-ion batteries also have a lower self discharge rate.This gives you a longer battery life in a lighter package.Stay in touch longer by getting battery power with a Lithium-ion battery.Higher energy density than most other types of rechargeable.Keep extras on hand at the office and one in a charger so you will always be powered up and ready!Specification:Brand Name SamsungPower Supply 1650 mAh Battery Type :Lithium Ion (Li-Ion)Compatible with:SamsungSamsung Galaxy S II I9100