High Capacity 'Intelligent' Lithium-Ion Battery For Sony Alpha NEX-3 - 5 Year Replacement Warranty High Capacity (Non-OEM) Battery (1200 Mah), 5 Year Warranty Chemistry: Lithium-Ion (No memory loss) Integrated microchip for communications with camcorder and charger, prevents overcharging, & lengthens battery life Includes 5 Year Replacement Warranty