The technology of the sphygmomanometer has undergone the development of the first generation of "air core" and the second and third generation of "airless core".
 Its advantage is that it has low requirements for measuring posture, and there is no need to worry about the influence of posture on errors.

Upper arm type sphygmomanometer lithium battery model: 7.4V 1100mAh

Cell Model of Upper Arm Sphygmomanometer: 14650

Lithium battery IC: Seiko
 
Lithium battery lead: UL1007 22AWG