Fenix ARB-L21-5000U Rechargeable 21700 Battery
The Fenix ARB‑L21‑5000U is a high-capacity 21700 rechargeable Li‑ion battery delivering 5,000 mAh of reliable power for high-drain flashlights and gear. Equipped with a built-in USB‑C charging port, you can recharge it quickly with common USB‑C cables—no separate charger required. Ideal for extended runtime and convenience.
Safety is front and center: it features comprehensive protection circuitry (overcharge, over-discharge, short-circuit, and overheat protection), as well as pressure relief vents for safe energy release. The button-top design ensures compatibility with a wide range of devices. Rated for 500 charge cycles, it maintains dependable performance over time.
Key Specifications:
- Capacity: 5,000 mAh, Nominal Voltage: 3.6 V
- Charge Rate: USB‑C port, up to 5 A max (standard 1–2 A recommended)
- Output: Up to 8 A discharge
- Safety Features: Multi-layer protection circuitry, pressure relief vents
- Longevity: Up to 500 full charge cycles
- Design: Button‑top format, 73 mm long, ~21.6 mm diameter, ~72 g
- Warranty: 12‑month manufacturer coverage
A robust and convenient power solution—perfect for tactical flashlights, headlamps, outdoor gear, and emergency devices.
Shipping Note: Lithium ion batteries are considered "dangerous goods" per US transportation regulations and can often only be transported via ground shipment. Orders containing loose batteries will typically take much longer than predicted to be delivered. Delivery times of 14+ days are not uncommon.
Frequently Asked Questions
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Yes, Festive Water Paddlesports is an authorized Fenix Store dealer. We carry a wide selection of Fenix Store products online and in store!
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All products at Festive Water Paddlesports are subject to their specific manufacturer's warranty policy.
Please refer to the Fenix Store website for more warranty information about the Fenix ARB-L21-5000U Rechargeable 21700 Battery.
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Yes, Festive Water provides outfitting and rigging services!
If you have a whitewater kayak or touring, we can modify and update your outfitting.
For fishing kayaks, we can install motors, fish finders, lights, and other electronics.
Check out our Kayak Rigging page for more information.
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Yes, we offer full and partial refunds. However, some products like kayaks, SUPs, and other watercraft are excluded (sales are final).
Please read our Refund policy for more information.
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Festive Water Paddlesports offers financing through Affirm. Add your items to the cart, check out, and select Affirm as your payment method.
Check out our Financing page to learn more about Financing.
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At Festive Water, to thank you for your service, we've partnered with GovX to offer a 10% discount on our store.
You can learn more by checking out our Military and Public Service page. -
Yes, Festive Water Paddlesports ships kayaks across the lower 48 U.S. states with white glove, premium shipping!
Shipping rates are calculated at checkout.
Learn more by checking out our Shipping Policy page.
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We use USPS and UPS for small packages, and private courier partners for kayak shipping. Use the shipping estimator in the checkout to check your shipping rates.
For more information, please check out our Shipping Policy.
