Cool knight&reg; 2 pack 2800mah rechargeable lithium battery with intelligent dock charger for Samsung Galaxy S5/I9600 2pack 3.8v DC 2800mah rechargeable lithium-on battery The battery is built in protection systerm,over current,over charge,over discharge protection function The intellgent charger supports dual output,multiple circuit protection to prevent overcharging,stable performance Package:2* batteries,1*Dock charger