Voltage: 3.7V / Capacity: 740mAh. SIZE: 14*49 MM Electric shaver battery for: 33766 S5 S6 S7 S51 53B 73S 4200 5762 Package Contents: There are 2 items to choose from. Package A: 1PCS batteries. Package B: 2PCS batteries Patented battery balancing technology. 70-80% capacity after 1000 charges The electric shaver is equipped with an intelligent power chip and has been tested by strict quality control standards Electric Shaver 3.7V 740mAh Li-ion Battery Replacement. Compatible With Braun 3766 S5 S6 S7 S51 53B 73S 4200 5762