C-H2 BlackBerry 7100i OEM extended Lithium-ion Cell phone battery. This battery is rated at 1800 mAh (the standard battery is 1000 mAh.)You can expect a 40-50% increase in talk and standby times over your standard battery. This combination DOES NOT includes the hard to find extended battery door (required) for the 7100i. You can purchase this separately or in a value priced combination in our Accessories section. IMPORTANT: Because the extended battery is thicker then the standard battery, you must also have the extended battery door. Note: All batteries are new,and unless they are defective, are not returnable.