




Fenix 21700 5000mAh 3.6V Protected Lithium Ion (Li-ion) Button Top Battery with Built-In USB-C Charging Port
- High 5000mAh capacity for long runtimes in flashlights
- USB-C port built in for convenient recharging
- PTC and PCB internal protections prioritizing safety
- 8A maximum output current for reliable power flow daily
- Size: 21700
- Voltage: 3.6
- Rechargeable: Yes
- Chemistry: Li-Ion
- Capacity (mAh): 5000
- Terminal Type: Button Top
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Description
Fenix 21700 Battery with USB-C Port
3.6V | 5000mAh Capacity | USB-C Charging Port
The Fenix ARB-L21-5000U 21700 battery stands out from other 21700 batteries with its built-in USB-C charging port. This charging port allows for high-speed charging so you can power up high-drain flashlights in under 4 hours. Plus, with an internal charging port, there is no need to purchase a separate charger! With 3.6 volts of power and a 5000mAh capacity, this 21700 is outfitted with PTC and PCB protections, ensuring extended runtimes and use. The 3 sets of overheat protection make sure the battery retains a stable temperature while powering your preferred flashlights. With these protection systems in place, combined with the USB-C charging port, this 21700 battery is the ideal companion for any 21700-compatible flashlight.
- Notable Features
- » 500+ charging cycles - a long term, environmentally-friendly power source
- » 3 sets of overheat protection ensure stable temperature day in and day out
- » Reliable 5000mAh capacity 21700 battery supports high runtimes in flashlights
Item Details
| Brand | Fenix |
| SKU | FENIX-ARB-L21-5000U |
| MPN | ARB-L21-5000U |
| Size | 21700 |
| Voltage | 3.6 |
| Battery Rechargeable | Yes |
| Capacity (mAh) | 5000 |
| Chemistry | Li-Ion |
| Sub-Chemistry | LiCoO2 ICR |
| Packaging | Retail Packaging |
| California Residents | see Prop 65 WARNINGS |
Specifications
| Size | 21700 |
| Voltage | 3.6 |
| Battery Rechargeable | Yes |
| Capacity (mAh) | 5000 |
| Watt Hours (wH) | 18 |
| Terminal Type | Button Top |
| Protected | true |
| Integrated Charge Port | Yes |
| Max. Discharge Rate | 8 |
Unit Dimensions
| Length | 2.99 in (76 mm) |
| Height | 2.99 in (76 mm) |
| Diameter | 0.85 in (22 mm) |
| Weight | 2.56 oz (73 g) |
Certifications & Transport
| Certifications/Standards | ANSI, CE, FCC |
| Country Of Origin | China |
| HTS Code | 85076000 |
Packaging/Shipping Dimensions
| Length | 2.99 in |
| Width | 0.85 in |
| Height | 2.99 in |
| Shipping Weight | 0.16 lb |
Documents
Additional Details
| Packaging | Retail Packaging |
| Warranty |
Fenix 1 Year Warranty Battery Junction Warranty |
| Return Policy | Return Policy |
Bright Buys
- Reliable lithium chemistry with a 10 year shelf life
- Regarded as one of the highest quality CR123A batteries on the market
- Used in LED flashlights, alarm systems, ranger finders and more
- Cells are lightweight, durable and ideal for long term storage
- Jacket style may vary
- Ideal for low-drain applications that require a primary battery to provide constant power
- 10-year shelf life - stock up for emergencies!
- The best choice for consistent power, great in low-drain devices like remotes
- Safe and reliable - capable of performing in high or low temperatures
- 11-in-1 card sized tool fits in your wallet or on a keychain!
- Packed with handy tools including a screwdriver & 7 wrench settings
- Serrated saw and straight-edge knife for quick cutting jobs
- Can + bottle openers for campsite meals or end-of-shift relaxation
- Four-channels saves time by charging multiple batteries at once.
- Capable of charging multiple chemistries by automatic battery detection.
- LCD display reveals the charging progress, battery type, voltage, and charging current.
- Automatic power-off function cuts off the current when charging is complete.
- Extremely compact and powerful EDC
- Max output of 3,000 lumens with a max throw of 229 meters
- Dual fuel and available with extender for use with a 26650
- Equipped with 4 x CREE XPG3 LEDs for maximum illumination
- 225mAh capacity drives long runtimes for watches and electronics
- CR2032 coin cells packed with 3V of power
- Convenient 6-piece retail card provides backup batteries
- Easily replaceable primary lithium cells
- Top recommended battery for Apple AirTags
- 3,000 lumens and a 250-meter throw - fierce illumination to light up your backyard
- Multiple output modes are accessible via easy side switch operation
- Strobe, SOS, and beacon modes offer distinct signaling capability
- High-capacity battery supports the light with a maximum 227-hour runtime
- Upgraded to output up to 3,100 lumens with a 1,000ft throw for optimal spotting!
- Offers fast, direct USB-C recharging from outlets, power banks, and more
- Ultra-slim design provides an easy-to-hold, simple EDC lighting solution
- OLED screen monitors performance, including charge level, brightness & beyond
- Pre-shrink wrapped Panasonic CR123A batteries great for OEM use & more
- 1550mAh high capacity keeps lights, alarms & more running longer
- Lithium cells with stable 3V output and strong discharge performance
- Storage life of up to 10 years ensures backups remain ready for use








