Battery2go - 1 year warranty - 3.6V Battery For Welch-Allyn 71150, 71051, 71000, 18100, 71110 Capacity: 750mAh / 2.7Wh Type: Ni-CD Volts: 3.6V Size : 72.02 x 28.50 x 25.69mm Certificated with ISO9001, RoHS & CE;