Ultra High Capacity 'Intelligent' Lithium-Ion Battery for Sony FDR-AX33 & FDR-AX53-5 Year Replacement Warranty Ultra High Capacity (Non-OEM) Battery (4200 Mah), 5 Year Warranty Chemistry: Lithium-Ion (No memory loss) Integrated microchip for communications with camcorder and charger, prevents overcharging, & lengthens battery life Also Applicable On Sony HDR-PJ540 Includes 5 Year Replacement Warranty