Fenix 18650 Rechargeable Battery h. The maximum current for the ARB-L18-3000P is 14A with a continuous output current of 10A. Why is this necessary? The higher current allows the 18650 battery longer runtimes in flashlights. As with all Fenix rechargeable batteries the 18650 3000mAH has three sets of overheat protection including pressure relief microporous and PTC cathodal block. Features pressure relief vents. Specifications for Fenix 3000mAh 18650 Rechargeable Battery: Manufacturer: Fenix Battery Quantity: 1 Battery Capacity: 3000 mAh Power: 3.6 volts Diameter: 0.73 in Length: 2.72 in Weight: 1.69 oz Battery Type: 18650 Battery Chemistry: Lithium-Ion Package Contents: Fenix 3000mAh 18650 Rechargeable Battery Fenix ARB-L18-3000P: 18650 Rechargeable Battery 3000mAh