PowerSmart 3.7V 900mAh Li-ion Replacement for SONY ERICSSON E16i, Live Walkman, Mini S51SE, ST15i, ST17i, U8i, W8, WT18i, WT19a, WT19i, Xperia E15a, Xperia E15i, Xperia Mini Pro SK17, Xperia Mini ST15a, Xperia X8, Xperia active, Xperia active ST17a Smart Phone Battery Battery Type: 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.