The Fenix 21700 5000 mAh (ARB-L21-5000U) rechargeable battery with its own USB-C charging connector. It can be charged by connecting a cable to the USB-C connector (e.g. from a computer, power bank or mobile phone charger) or in a conventional Li-ion charger. The Fenix 21700 5000 mAh rechargeable batteries with electronics protection (protected) are based on cutting-edge LiNiCoO2 technology, which brings both higher safety and longer life. Li-ion rechargeable batteries are characterized by very high capacity, do not suffer from memory effect or self-discharge. Li-ion in size 21700 are the best choice in terms of stored energy due to the size and weight of the battery, and are gradually gaining ground in the automotive industry.
Fenix battery protection consists of internal safety mechanisms and protective electronics. Added electronic circuits prevent the cell from overcharging, over-discharging and against short-circuiting or excessive current draw. If the battery electronics assess that the limits have been reached, they safely disconnect the cell.
Internal protection consists of a separator, state-of-the-art Positive Temperature Coefficient (PTC) overheat 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.
This battery is designed to operate in, for example, the Fenix HT18, PD36R, PD36 TAC, PD40R, TK20R V2.0, TK22 UE, E35 V3.0 and C7. However, it cannot be used in 18650 battery flashlights due to its larger size!
Because of the 76 millimeter battery length (including the protective electronics), it can only be charged in chargers that are designed for this length. See recommended chargers below.
Fenix 21700 5000mAh USB Battery Specifications
- Nominal voltage : 3.6V
- Capacity : 5000 mAh, tested at 0.2 C discharge current with termination at 2.5 V and 25°C
- Maximum current draw: 8 A
- Maximum charging current: 5 A
- Built-in USB-C connector charging current 2A. Charging time approximately 3-4 hours.
- Dimensions: 21.5mm (diameter) x 76mm (length) (+/- 0.5mm)
- Weight 72.5 grams
- Overcharge, full discharge and short circuit protection (>8 A). Protective circuit mounted on the plus pole.
- 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 USB battery Fenix 21700 5000mAh (ARB-L21-5000U)
- Charging cable not included. If needed, a basic USB-C cable or longer USB-C cable can be purchased, or a micro-USB to USB-C reduction can be used.
Charging via USB-C connector
Plug the USB cable into the side USB-C connector, during charging the indicator light in the plus pole of the battery is red. When full charge is reached, it glows blue or green.
Recommended chargers
The battery can also be charged in chargers for Li-ion batteries type 21700:
Fenix ARE-X1 V2.0 Charger
Fenix ARE-A2 charger
USB charger Fenix ARE-D1
USB charger Fenix ARE-D2
Fenix ARE-A4 charger
USB Charger SC1
VC8 eight-channel USB charger
Warning
- Do not discharge the battery below 2.5V 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
- Do not 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.
