The Golisi S35 21700 is a high-performance 3750mAh rechargeable lithium battery with 40A high constant current applications. The IMR 21700 battery can be recharged more than 800 times and is enough to run various high drain devices. Compared to traditional batteries, it is more powerful, safer, and economic to use. Parameters: Size: 21x 70mm Model: 21700 Capacity: 3750mAh Constant Current: 40A Nominal Voltage: 3.7V Charging cut-off voltage: 4.20± 0.05V Internal resistance: 30mΩ Cycle times: >800 Standard charging current: CC/CV (<=3A) Fully charged time: Down to 2 hours (by using Golisi charger) Operate temperature: Charging(0- 45℃), Discharging(-20- 60℃) Storage Temperature: Room temperature, dry place Apply to: E-Cig Mods, flashlights, and toys Features: -Rechargeable more than 800 times -Hard-wearing wrap to avoid short circuit -3750mAh high capacity with high energy density -Internal protection sheets to avoid over-discharging and over-charging