High Capacity 6500mah Li-ion Replacement Extended Battery With Back Door Cover For LG G4 BL-51YF/G4/H818 (Black) Each item has been checked and in good condition before shipping Integrated microchip inside prevents overcharging and lengthens battery life Compared with Nickel-Cadmium battery, the Li-ion Battery has no memory effect If you don't use the battery for a long time, please put it in a dry and cool place and make it full charged once every three months Use the authorized charger only