Smart Power PowerSmart 3.7V 2000mAh Li-ion Portable Media Player Battery for ARCHOS PMA400, PMA430, AV420, AV400 Series, Compatible Part Numbers: 300360, 300369, 400055, 400058, 500667, 500672 Compatibility: AV400 Series (NOT Compatible with AV440, AV480, AV4100) Battery Type: Lithium-ion (Li-ion) Voltage: 3.70V Capacity: 2000mAh Color: Metallic Grey Dimension: 68.10 x 57.70 x 9.14 mm || Rate: 7.00 Wh Weight: 61.60 g Product Type: Replacement Battery (Brand New) Condition: New, 1 year warranty! Please ensure the product(s) that you are going to buy fits the brand, model, part number and dimension (mentioned above) of your device.