iTEKIRO 4000mAh Extended Battery for Panasonic PV-L453D, PV-L454, PV-L454D, PV-L501, PV-L501D, PV-L550, PV-L550D, PV-L551, PV-L551D, PV-L552, PV-L552H, PV-L557 Replacement battery for Panasonic PV-L453D, PV-L454, PV-L454D, PV-L501, PV-L501D, PV-L550, PV-L550D, PV-L551, PV-L551D, PV-L552, PV-L552H, PV-L557; Please note this battery is an extended version, it has more cells so it is thicker, heavier than the original battery, and it lasts longer than the original battery Battery specifications: Ni-MH, 6V, 4000mAh; This "No-Memory-Effect" extended battery has higher capacity than original one (1000mAh), it can be fully charged from any level with no reduction in capacity Made with premium quality cells to meet or exceed the OEM specifications Integrated microchip prevents overcharging & lengthens the battery life Satisfaction guarantee with 1 year replacement warranty