PowerSmart 3.60V (Compatible with 3.7V) 900mAh Li-ion MD Walkman LIP-8 Battery for SONY MZ-R50 MZ-R5ST Battery Type: Li-ionVoltage: 3.60V (Compatible with 3.7V) Capacity: 900mAh //Color: Dark Grey Dimension: 67.70 x 15.85 x 18.20 mm Weight: 131.00 g Product Type: Replacement Battery (Brand New) Condition: New, 1 year warranty! Remarks: Please ensure the product(s) that you are going to buy fits the brand, model, part number and dimension (mentioned above) of your device. If the part number of your original battery or machine model is not listed in our description, please contact us to confirm the compatibility before biding.