Cameron Sino Rechargeble Battery for Oral-B 3738 Type: Li-ion, Volts: 1.2V, Capacity: 2500mAh/3.0Wh Dimension: 49.80 x 17.30 x 17.30mm, Weight: 60g All Products are Certificated with ISO9001, RoHS & CE 14 Days Money Back Guarantee and 12 Months Warranty