SPERAS M4 v3 21700 Battery Tube | Extended Runtime
- $22.99
- $22.99
- Unit price
- per
Unlock Maximum Performance: Transform your standard M4 V3 into a powerhouse. By equipping this TB217 extension tube and an S50 21700 battery, the M4 V3 achieves its true potential—a staggering 2800 lumens and 740 meters of beam distance.
Extreme 500-Hour Runtime: Ideal for long outdoor excursions, camping, or survival kits. The larger 21700 battery capacity pushes the ECO mode runtime to an incredible 500 continuous hours, ensuring you never run out of light.
Seamless Integration: Precision CNC-machined from the same aerospace-grade aluminum as the M4 V3. The knurled texture provides an enhanced, ergonomic grip while perfectly matching the flashlight's original aesthetics.
Bundle & Save: Pair this extension tube with the M4 V3 flashlight and the S50 battery to unlock the ultimate lighting experience and take advantage of our bulk discounts below.
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Warranty
Most flashlights can directly get 5 years warranty; battery and accessories get 1 year warranty.
Note
Any questions, please email to info@sperasflashlight.com
TB217 Extension Tube: Maximize Your M4 V3
Transform your compact SPERAS M4 V3 Flashlight into an outdoor-ready searchlight powerhouse. The TB217 extension body allows you to seamlessly swap out the standard 18350 battery for a massive high-capacity 21700 lithium-ion cell, instantly boosting both your peak brightness and overall runtime.
Why Upgrade to the TB217 21700 Tube?
- Unleash Peak Performance: With the higher discharge rate of a 21700 battery, the M4 V3's maximum output jumps to a blinding 2800 lumens and extends the beam distance to 740 meters.
- Extreme 500-Hour Runtime: Accommodating a 5000mAh 21700 battery drastically increases your efficiency, pushing the maximum ECO mode runtime to an incredible 500 hours for off-grid survival.
- Improved Ergonomics: The extended body length provides a comfortable, full-hand tactical grip, ideal for night patrols, search and rescue, or use with heavy gloves.
- Seamless Integration: Simply unscrew the original short body and thread on the TB217 extension. Machined from the same aerospace-grade 6061 aluminum alloy with Military Type III hard-anodizing for a perfect match.
Frequently Asked Questions
What is the TB217 Extension Tube used for?
The TB217 is a custom-machined accessory designed specifically for the SPERAS M4 V3 flashlight. It replaces the original short battery tube, allowing the flashlight to be powered by a much larger 21700 lithium-ion battery (like a 5000mAh cell) instead of the standard 18350 battery.
Will this tube make my M4 V3 flashlight brighter?
Yes! Upgrading to a 21700 battery via the TB217 tube unlocks the flashlight's peak potential. The maximum lumen output increases from 2200lm to 2800 lumens, and the maximum beam throw distance is extended from 700m to 740 meters.
How much does the runtime improve with the 21700 battery?
The runtime sees a massive improvement. When equipped with the TB217 tube and a high-capacity 5000mAh 21700 battery, the M4 V3 can run for up to 500 hours continuously on its lowest ECO setting, making it perfect for extended camping trips or emergency blackouts.
📦 30-Day Satisfaction Guarantee
We stand behind our quality. If you are not completely satisfied with your purchase, you may return it within 30 days of delivery for a full refund or exchange.
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