
Fenix ARB-L21-4000P 21700 4000mAh 3.6V Protected High-Drain Lithium Ion (Li-ion) Button Top Battery
- 21700 battery with 4000mAh capacity powers high-drain devices longer
- 18A discharge rate ideal for ultra-bright lights
- Fast 4A charge rate for quick power replenishment
- Full protection against overcharge & short circuit
- Size: 21700
- Voltage: 3.6/3.7
- Rechargeable: Yes
- Chemistry: Li-Ion
- Capacity (mAh): 4000
- Terminal Type: Button Top
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Description
Fenix 21700 4000mAh Battery
ARB-L21-4000P
The ARB-L21-4000P is a power-packed Li-ion 21700 battery from Fenix that features a whopping 4,000mAh capacity and 500 charge cycles for your favorite flashlight or electronic device. The 18A max discharge rate is ideal for extremely bright flashlights like the Fenix LR35R searchlight with a 10,000 lumen turbo.
This battery can also handle up to a 4A charge rate, allowing for lightning-quick recharging with a sufficient charger. Multiple forms of overheat, overcharge, over-discharge, and short circuit protection keep you and your devices safe.
- Notable Features
- » 4,000mAh capacity nearly double that of comparable 18650s
- » 3 sets of overheat protection, as well as overcharge, over-discharge, and short circuit protection
- » 18A max output current for long-lasting turbo modes on flashlights
- » 500 charge cycles saves you money, and is eco-friendly
Item Details
| Brand | Fenix |
| SKU | FENIX-ARB-L21-4000P |
| UPC | 6942870307220 |
| Size | 21700 |
| Voltage | 3.6/3.7 |
| Battery Rechargeable | Yes |
| Capacity (mAh) | 4000 |
| Chemistry | Li-Ion |
| Packaging | Retail Packaging |
| QTY Per Package | 1 |
| California Residents | see Prop 65 WARNINGS |
Specifications
| Size | 21700 |
| Voltage | 3.6/3.7 |
| Battery Rechargeable | Yes |
| Capacity (mAh) | 4000 |
| Watt Hours (wH) | 14.4 |
| Terminal Type | Button Top |
| Protected | true |
| Integrated Charge Port | No |
| Max. Discharge Rate | 18 |
| Equivalent Types | 21700 |
Unit Dimensions
| Length | 2.99 in (76 mm) |
| Diameter | 0.85 in (22 mm) |
| Weight | 2.47 oz (70 g) |
Certifications & Transport
| Certifications/Standards | CE, FCC |
Packaging/Shipping Dimensions
| Length | 0 in |
| Width | 0 in |
| Height | 0 in |
| Shipping Weight | 0.154 lb |
Documents
Additional Details
| Packaging | Retail Packaging |
| Warranty |
Fenix 1 Year Warranty Battery Junction Warranty |
| Return Policy | Return Policy |
Bright Buys
- Trusted and reliable; consistently rated as a top customer pick for LED flashlights
- Superior 1,600mAh capacity means longer runtimes and less frequent battery changes
- Optimized for both high and low drain devices
- State-of-the-art automated production lines ensure the highest quality and safety protections
- 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
- 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
- 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
- Independent 4-slot charging for different batteries
- Touch screen control provides user-friendly operation
- 4 working modes for charging, testing batteries, and more
- Compatible with Li-ion, Ni-Cd, & NiMH batteries
- Quick Charge 3.0 technology enables fast and efficient device charging
- USB compatibility supports a wide range of electronic devices
- Compact adapter design makes it ideal for travel and everyday use
- Intelligent charging management helps optimize power delivery
- Universal cable to consolidate chargers for work, home, or EDC use
- USB-C, Micro-USB, and Lightning plugs for various electronics
- USB-C input with USB-A adapter for use with any USB power source
- 3.93ft long cord, allowing you to use your phone during recharging!
- Premium materials for durability and fast charge speeds
- Fits flashlights w/ diameter of 24-32mm & length of 130mm-170mm
- Great for EDCs, tactical lights, slim lights, & more!
- Durable and flexible nylon material keeps lights secure
- 33g weight won't drag you down!
- Portable powerhouse - emits a 1148ft beam from a 3.4in light!
- Strobe and SOS modes accessible for emergencies
- Dual-fuel power - swap in a CR123A when needed
- Strong magnetic tailcap for hands-free repair jobs
- USB-C port offers seamless recharging from anywhere!
- 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


