Fenix 18650 3500 mAh rechargeable battery (L18-3500U) with its own micro-USB charging connector. It can be charged by connecting the cable to the micro-USB connector (e.g. from a computer or mobile phone charger) or in a conventional charger. Li-ion rechargeable batteries are characterized by a 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 due to the size and weight of the battery.

The Fenix battery protection consists of internal safety mechanisms and protective electronics. Added electronic circuits prevent the cell from overcharging, over-discharging and against short circuit or over-current draw. If the battery electronics assess that the limits have been reached, they safely disconnect the cell.

Internal protection consists of a separator, over-temperature protection (PTC thermal protection) and a special anti-blast valve. In the event that 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 anti-blast valve releases the excess gas pressure outside the battery. The combination of electronic and mechanical (temperature and pressure) protection makes Fenix batteries among the safest Li-ion batteries available.

The 18650 battery is roughly equivalent in size to two CR123A lithium batteries, which is why it is often used in flashlights as a rechargeable alternative to these primary cells. Please check first whether your appliance supports this cell. This battery is designed to operate in, for example, Fenix E28R V2.0, E30R, Fenix E35 UE (not intended for E35 V3. 0 and E35R), PD32R, PD35 V3.0, PD35R ACE, TK11 TAC, TK11R, TK15, TK16 (1000 lm version only), TK25 UV, TK25 IR, TK25 Red, TK25 R&B, TK35R, TK75, FD41, LD30, LD30R, LD35R, WT25R. LED headlamps Fenix HL55, HL60R, HP12R-T, HP25R (1000lm version only), HP30R (1750lm version only), HM60R, HM61R, HM62-T, HM65R, HM65R-T, HM75R, HM75R Topaz, lanterns CL26R, CL30R and the Fenix BC21R, BC22R and BC30 bike lights.

Caution, due to length and diameter, may not fit some old models - for example, Fenix PD31, PD32 XP-G2, TK11, TK21, TK30.

Warning, due to the 70mm length and diameter, may not fit some old models - for example Fenix PD31, TK11, TK21, TK30, Zebralight, Solarforce. The battery is also not compatible with the Fenix FD65 and Fenix TK47 models.

Fenix 18650 3500mAh USB battery specifications

• Nominal voltage : 3.6V
• Capacity : 3500 mAh, tested at 0.2C discharge current with termination at 2.5V and 25°C
• Maximum current draw : 2C (7 A)
• Maximum charging current : 2 A, charging current of built-in micro-USB input : 0.8 A.
• Dimensions: 18.6 mm (diameter) x 70 mm (length) (+/- 0.5 mm)
• Weight 50.2 grams
• Protection against overcharging, full discharge and short circuit (>7 A).
• Lifetime of more than 500 charge cycles
• Recommended operating temperatures: 0-45°C (charging), -20 to +60°C (discharging)
• Scope of delivery: one piece of Fenix 18650 3500mAh USB battery (ARB-L18-3500U).
• USB cable is not included but can be purchased separately.
• A used cell datasheet directly from the manufacturer can be downloaded here.

Charging via micro-USB connector

Plug the USB cable into the side micro-USB connector, during charging the indicator light on the top of the battery is red. When the battery reaches full charge, it glows blue or green.

Recommended chargers

Fenix ARE-A2 Charger
Fenix ARE-A4 charger
USB charger Fenix ARE-D1
USB charger Fenix ARE-D2
Mini USB charger MC1
USB charger Lii-100
Lii-500S charger
VC8S eight-channel USB charger
SkyRC MC3000

Warning

• If you are using an older charger purchased approx. before 2014, please check first if it will fit batteries with a length of 69-70 mm
• Do not discharge the battery below 2.5 V if possible
• 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 into the charger in reverse (opposite polarities)
• When using the battery, observe safety guidelines
• Use only an adequate charger that supports Li-ion batteries

Warranty

Warranty two years.