VINTRONS 1250mAh Battery For Mio 138, Mio C710, Mio C510, Mio C510e, Mio C310, Mio C310x, Capacity: 1250mAh Type: Li-ion Volts: 3.7V Size : 49.56 x 36.12 x 6.46mm Certificated with ISO9001, RoHS & CE;