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Perfine 6,440mAh Note 4/N910F/N910H Extended Replacement Battery for Samsung Galaxy 4 -Warranty:180 days Perfine worry-free warranty support. -Battery dimensions and weight:3.85L x 1.64W x 0.45H inches;105 grams. -Multiplies as much 2.0X battery power to your device as the OEM 3,220mAh battery. -Designed with lithium-ion cells,no memory effect. - Come with 2 Perfine protective back-piece to accommodate the extended battery for Samsung Galaxy Note 4 -High energy:the high energy storage density has reached 460-600Wh/kg, is about 6-7 times that of lead-acid batteries. -Lower self-discharge rate: is one of the most prominent advantages of the battery, could be done by 1%/month or less, less than 1/20 of NiMH batteries. Compatible Models: Samsung Galaxy Note 4, N910, N910C, N910H N910U 4G LTE N910V(Verizon) N910T(T-Mobile) N910A(AT&T) N910P(Sprint) N910R(U.S. Cellular) NOT for Samsung GALAXY Note Edge Please Note:1. This Note 4 6440mAh extended battery is thicker than the original battery. The black-white special back doors have to be used with the larger battery (included with each battery) . 2. Please use the original factory charger for charging. In order to get a fully charged, we advise you to continue charging for 20-40 minutes after charging light turns to green. Repeats 3-5 times,then your new battery can be reached the optimum effect of using .