Premium rechargeable Fenix 18650 4000 mAh (ARB-L18-4000) batteries with protective electronics (protected) deliver the highest real capacity on the market. Li-ion rechargeable batteries are characterised by very high capacity, do not suffer from memory effect and have no self-discharge. Li-ion in 18650 size are the best choice in terms of stored energy relative to battery dimensions and weight.

Protection of Fenix batteries consists of internal safety mechanisms and protective electronics. Added electronic circuits prevent overcharging of the cell, excessive discharge and protect against short circuit or excessively high current draw. If the battery electronics detect that limit values have been reached, they safely disconnect the cell.

Internal protection consists of a separator, overheat protection (PTC thermal protection) and a special anti-explosion valve. If the gas pressure in the cell exceeds a certain threshold, the internal separator isolates the electrodes inside the battery and thereby effectively interrupts the exothermic reaction, and the anti-explosion valve releases excess gas pressure from the battery. Thanks to the combination of electronic and mechanical (thermal and pressure) protection, Fenix batteries are among the safest available Li-ion rechargeable batteries.

In size, the 18650 battery corresponds to approximately two CR123A lithium batteries, which is why it is often used in torches as a rechargeable alternative to these primary cells. Check first whether your device supports this cell. This battery is designed for use in Fenix LED torches such as E28R, PD32R, PD35, PD35R, TK11R, TK25 UV, TK25 Red, LD30R, WT25R. Fenix LED head torches HL55, HL60R, HP25R (1000lm version only), HP30R (1750lm version only), HM60R, HM61R, HM65R, HM65R-T, lanterns CL26R, CL30R and Fenix bike lights BC21R and BC30.

Note: due to length and diameter, it may not fit some older models – for example Fenix PD31, TK11, TK21.

Fenix 18650 4000mAh battery specifications

• Nominal voltage: 3.6 V
• Capacity: 4000 mAh.
• Maximum current draw: 7 A
• Maximum charging current: 4 A
• Dimensions: 18.75 mm (diameter) x 69.2 mm (length) (+/- 0.5mm)
• Weight: 55 grams
• Protection against overcharging, complete discharge and short circuit (>7 A). The protection circuit is attached to the positive pole.
• Service life of more than 500 charging cycles
• Recommended operating temperatures: 0–45°C (charging), −20 to +60°C (discharging)
• Package contents: one Fenix 18650 4000mAh battery (ARB-L18-4000).

Recommended chargers

Fenix ARE-A2 charger
Fenix ARE-A4 charger
Fenix ARE-D1 USB charger
Fenix ARE-D2 USB charger
MC1 mini USB charger
SC1 USB charger
FC2 dual-channel USB charger
Lii-100 USB charger
Lii-500S charger
VC8 eight-channel USB charger
SkyRC MC3000

Warning

• If you are using an older charger purchased around 2014 or earlier, first check whether batteries with a length of 69–70 mm will fit into it.
• 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 conductor)
• Do not throw the battery into fire or water
• Never insert the battery into the charger in reverse (with opposite polarity)
• When using the battery, observe safety guidelines
• Use only an appropriate charger that supports Li-ion batteries

Warranty

Two-year warranty.

• Capacity: 4000mAh
• Weight: 55g

We offer a 30-day period for returning or exchanging goods if, for any reason, you are not satisfied with your order.

For more information, please see our Return Policy here.

Orders received by 14:00 are dispatched the same day. Delivery usually takes place on the next business day, depending on the selected shipping method. During busy periods, please allow 1–3 business days for order processing.

Free delivery from €200 / for oversized shipments from €400

Free of charge, ready for pickup on the next business day

For more information, please see our Delivery page.