Fenix ARB-L18 Rechargeable 18650 Battery - 4000mAh

SPECIFICATIONS 

Capacity: 4000mAh
Voltage: 3.6V
Charging Current: 2A recommended, 4A maximum
Max Output Current: 7A
Weight: 1.94 ounces (55g)
Size: Length: 2.72" (69.2mm) Diameter: 0.74" (18.75mm)

The Fenix ARB-L18-4000 Rechargeable Battery is a large
capacity battery with 4000mAh of power, ensuring a longer lasting
charge. 7A stable output current and excellent thermal performance help
you prevent overheating. With multiple protection circuits and pressure
vents, it provides added safety and can be charged for up to 500 cycles.