The UltraFire 21700 flashlight offers even more power and extended battery life. With a robust, rechargeable 21700 battery, it delivers brighter light and longer runtime. Built tough for outdoor adventures and emergencies, it’s compact, durable, and equipped with multiple brightness modes for versatile use.

21700 Flashlight

365NM | ZWB2 FILTER | 6.5 IN

Compact and powerful, the RUV3 delivers a true 365nm UV beam with a ZWB2 filter, dual modes, and 4.5-hour runtime—ideal for forensics, mineral checks, and scorpion hunting.

$56.99
$46.99
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1500 LUMENS | ZOOMABLE | 550M

The UltraFire UF2 delivers 1,500 lumens, zoomable focus, and a durable, USB-C rechargeable design built for outdoor work and everyday carry.

$49.99
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1200 LUMENS | 200M | 5.35 IN

The UltraFire UF3 is a compact, durable tactical flashlight delivering 1200 lumens and a 200-meter beam. Ideal for outdoor adventures, emergencies, and everyday carry.

$34.99
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850 LUMENS | 3 MODES | 18.89 IN

The UltraFire UF-806 is an 850-lumen traffic wand with 3 modes, lightweight build, and durable design—perfect for traffic control and emergency signaling.

$27.99
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365NM/395NM | 10W | 4.96 IN

The UltraFire RUV2 delivers 10W UV light, a durable aluminum body, and USB-C rechargeable portability—perfect for precision tasks, DIY projects, and outdoor use.

$33.99
$29.99
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1400 LUMENS | 500M | 5.3OZ

The UltraFire S2 is a compact, rechargeable EDC flashlight delivering 1400 lumens with a 500-meter beam. Featuring a side switch with 8 modes, COB side light, IP65 waterproof/dustproof rating, and a built-in charging port, it’s ideal for work, outdoor tasks, and everyday use.

$22.99
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2500 LUMENS | 643M | 4.8 IN

UltraFire UF-H7 packs 2500 lumens in a compact, rechargeable body. Durable, water-resistant, and EDC-ready for any task or adventure.


$37.99
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1800 LUMENS | 160M | 5.51 IN

The UF3 PRO delivers 1800 lumens in a rugged tactical design with dual switches for fast, reliable control—ideal for law enforcement, patrol, and outdoor use.

$57.99
$39.99
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619 LUMENS | Type-C | 6.3 IN

The UltraFire UF-805 is a USB-C rechargeable traffic wand flashlight (619 lumens) with IP68 waterproofing and rugged aluminum body—ideal for airports, traffic, and emergencies.

$38.99
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3350 LUMENS | 300M | 5.2 IN

The UltraFire UF-DIV13S delivers 3350 lumens with a 300 m beam, offering bright, clear illumination for cave diving, night exploration, and underwater photography.

$89.99
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3100 LUMENS | 320M | 5.71 IN

Tough and tactical, the LR1 blasts 3,100 lumens with a 320-meter beam, dual-tail control, and USB-C rechargeable power — built to perform in any mission.

$99.99
$72.99
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150000 LUMENS | 24 LED | 11.42 IN

The UltraFire V8 Apollo delivers 150,000 lumens, Type-C fast charging with discharging, and a heavy-duty, weather-resistant design built for extreme brightness and versatility.

$599.99
$559.99
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5200 LUMENS | 500M | 21700

The UltraFire TPG packs 5,200 lumens, multi-mode versatility, and a magnetic base into a tough, rechargeable flashlight built for everything—from camping and reading to emergencies and work lighting.

$99.99
$57.99
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2500 LUMENS | 100M | 5 LED

The UltraFire ET28 is a 2500LM rechargeable flashlight with 5 LEDs, RGB modes, USB charging, IP67 waterproof, and compact, versatile lighting for any outdoor or emergency use.

$25.99
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​​21700 Flashlights: High-Performance Illumination for Modern Needs​​

A. ​​Superior Battery Capacity & Energy Density​​

21700 flashlights utilize lithium-ion batteries measuring ​​21mm in diameter and 70mm in length​​, offering ​​4,000–5,000mAh capacity​​ and ​​20–30% higher energy density​​ compared to 18650 cells. This translates to extended runtime (e.g., ​​12+ hours on medium modes​​) and compatibility with high-power LEDs​​, which deliver ​​2,000–5,200 lumens​​ for tasks like search-and-rescue or outdoor exploration.

B. ​​​​Rugged Design & Adaptive Features​​

Premium models like the ​​UltraFire T5​​ feature ​​IPX8 waterproofing​​, ​​aircraft-grade aluminum alloy bodies​​, and ​​thermal regulation systems​​ to prevent overheating during prolonged high-brightness use. 

Frequently asked questions

Have questions? We’re here to help

Title

Q1: ​​​​Can I use 18650 batteries in a 21700 flashlight?​​

A: Yes, with adapters. Most 21700 flashlights (e.g., ​​UltraFire UF-806​​) support 18650 cells, though runtime and brightness may drop by 15–20%.

Q2: ​​​​What makes 21700 better than 18650?​​

A: Higher capacity (​​5,000mAh vs. 3,500mAh​​), superior discharge rates (​​70A continuous​​), and longer lifespan (​​500+ cycles​​).

Q3: ​​​​Do they work as power banks?​​

A: Select models (e.g., ​​UltraFire UF2) include ​​USB-C power bank functionality​​ to charge phones or GPS devices.

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