Samsung BP420E Li-Ion Replacement Battery for Samsung SMX-F40 , HMX-H204BN and Other Camcorders Non-OEM equivalent replaces Samsung BP420E Specifications: Voltage 3.7V (volts) ; Capacity 4200 MAH Chemistry: Lithium Ion Rechargeable - No Memory Effect Utilizes BSP Technology for Surge & Overload Protection, Thermal-Cut-Off; Guards Against Short Circuits Quality Guarantee - backed with a 3-Year Manufacturer's Warranty!