Power2tek 3.7V BATTERY Fits to Ninetendo DSiL, NDSiL, NDSi, C/TWL-A-BP, TWL-003, Dsi +FREE ToolSet Capacity: 550mAh Type: Li-Polymer Volts: 3.7V Size : 55.09 x 27.04 x 6.51 mm Certificated with ISO9001, RoHS & CE;