vintrons 550mAh Battery For DeTeWe 480i, Aastra 480i, CM-16, 9480i CT, 57i CT, 6757i CT, Capacity: 550mAh / 1.98Wh Type: Ni-MH Volts: 3.6V Size : 47.52 x 34.18 x 6.58mm Certificated with ISO9001, RoHS & CE;