Rechargeable USB-C battery Fenix 18650 4000 mAh (Li-Ion)

Fenix's premium rechargeable 18650 4000 mAh batteries with custom USB-C charging connector (ARB-L18-4000U) with electronics protection (protected) deliver the highest real-world capacity on the market. Li-ion rechargeable batteries feature very high capacity, do not suffer from memory effect or self-discharge. Li-ion in the 18650 size are the best choice in terms of stored energy in relation to the size and weight of the battery.

The battery can be charged by connecting a cable to the integrated USB-C connector (e.g. from a computer or mobile phone charger), but also in a flashlight equipped with a USB connector or in a charger that can accommodate Li-ion batteries with a length of 72 millimeters.

Note that this battery is approximately 72 millimetres long due to the added USB-C charging connector, so it is significantly longer than a conventional 18650 Li-ion. It will therefore only fit in some flashlights, headlamps and chargers. We have verified compatibility in the following Fenix flashlights and headlamps: Fenix PD32R, Fenix PD35 V3.0, Fenix E28R V2.0, Fenix LD30R, Fenix TK11 TAC, TK11R, TK26R, Fenix TK35 UE V2.0 (5000 lumens), Fenix CL26R, Fenix CL30R, Fenix HM62-T, HM65R-T V2.0, HM75R, Fenix HM61R, Fenix HM61R, Fenix HM61R V2.0.

Fenix battery protection consists of internal safety mechanisms and protective electronics. The added electronic circuits prevent the cell from overcharging, over-discharging and short-circuiting or drawing too much current. If the battery electronics assess that the limit values have been reached, they safely disconnect the cell.

The internal protection consists of a separator, overheating protection (PTC thermal protection) and a special explosion-proof valve. If the gas pressure in the cell exceeds a certain limit, the internal separator separates the electrodes inside the battery and thus de-facto interrupts the exothermic reaction and the explosion-proof valve releases the overpressure gas outside the battery. The combination of electronic and mechanical (temperature and pressure) protection makes the Fenix battery one of the safest Li-ion batteries available.

Parameters of the Fenix 18650 4000 mAh USB-C battery

• Nominal voltage: 3.6 V
• Capacity: 4000 mAh
• Maximum current draw: 7 A
• Maximum charging current: 4 A
• Dimensions: 18.75 mm (diameter) x 72 mm (length) (+/- 0.5mm)
• Weight: 50 grams
• Protection against overcharge, full discharge and short circuit (>7 A). Protection circuit attached to the plus pole.
• Lifetime of more than 500 charging cycles
• Recommended operating temperatures: 0-45°C (charging), -20 to +60°C (discharging)
• Scope of delivery: one piece of Fenix 18650 4000mAh battery (ARB-L18-4000U).

Charging via USB-C connector

Plug the USB cable into the side USB-C connector, the indicator light on the top of the battery pack will glow red during charging. When the battery reaches full charge, the light turns blue. When using a USB power supply with a current of 1500 mA or higher, the charging time is approximately 2.5 hours.

Recommended chargers

Fenix ARE-A2 charger
Fenix ARE-A4 charger
USB charger Fenix ARE-D1
USB charger Fenix ARE-D2
FC2 Dual Channel USB Charger
USB Charger SC1
Eight-channel USB charger VC8
SkyRC MC3000

Notice

• The battery is approx. 72mm long, please check first if it will fit your device!
• If possible, do not discharge the battery below 2.5 V.
• Do not short-circuit the battery (do not connect the cell poles with a wire).
• Do not throw the battery into fire or water.
• Never insert the battery pack into the charger in reverse (opposite polarities).
• When using the battery, observe the safety principles.
• Use only an adequate charger supporting Li-ion batteries.

Warranty

Two years warranty.