Panasonic VW-VBD58 High Capacity Replacement Intelligent Battery (Non-OEM) Ultra High Capacity (Non-OEM) Battery (6000 Mah, 7.2V) Chemistry: Lithium-Ion (No memory loss) Integrated microchip for communications with camcorder and charger, prevents overcharging, & lengthens battery life Includes 2 Year Replacement Warranty