Model Number: S-3.7V 4400mAh-#9738 Brand Name: HETER Key Specifications/Special Features: 1. With UL, CB, CE, MSDS and UN38.8 certificates2. Cycle lifespan: more than 500 times in 100% DOD, 800 times in 80%DOD and 1200 times in 50%DOD and 80% residual capacity3. OEM services Chemical system:Lithium ion battery Nominal voltage: 3.7V Nominal capacity: 4400mAh Assembly: 1S2P Cells of assembly: 18650-3.7V-2200mAh BMS: Inside integrated Charge voltage: 4.2V Fast charge current: 4.4A Maximum discharge current: 9A Peak current: 50A Resistance: <60mΩ Case: PVC or ABS Case color: OEM Terminal: Wire + connector Battery pack size: (20±2)*(43±2)*(80±2)mm or custom made Battery pack weight: 120±2g OEM: Welcome