609B Battery

Capacity: 3.7V  5200mah  (10.24Wh) rechargeable Lithium-ion battery. 
Designed for USB (5V) heated vest, heated jacket, heated seat cushion and more.
Optional Rubber finish available
Output: DC 5V/DC  2.1AMP
 
Weight: 3 ounces
Dimention: 2.8" x1.9"x 0.8"  (7cm x 5cm x 2.2cm)