750B / 751B Battery (7.4V)

Specifications: 7.2V    
Capacity: 5000mah (36Wh) rechargeable Lithium battery. 
Designed for heated clothing  and more
LED capacity indicator
 
Output:  DC output port 7.4V
Output:  USB-C for charging mobile device (model 751B only)
Input Charging: USB-C