PowerSmart 3.7V 900mAh Replacement Smart Phone EP500 Battery for Sony E16i Live Walkman Mini S51SE SK15i SK17i ST15i ST17i U5i U8i Battery Type: Lithium-ion (Li-ion) Voltage: 3.70V Capacity: 900mAh Color: Black Dimension: 42.30 x 45.00 x 6.35 mm///Weight:25.7 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.