Upgrade your SPERAS M4 V3 flashlight with the TB217 21700 Battery Extension Tube, a precision-machined accessory designed to accommodate a larger 21700 Li-ion battery in place of the original 18350 battery.

With a compatible high-capacity 21700 battery, the M4 V3 can deliver up to 2,800 lumens, a maximum beam distance of 740 meters, and up to 500 hours of runtime in ECO mode. The extended battery tube also provides a longer, more comfortable grip for outdoor use.

Upgrade to 21700 Battery Power

The TB217 replaces the original short battery tube of the SPERAS M4 V3, allowing the flashlight to operate with a single 21700 Li-ion battery.

Compared with the standard 18350 configuration, a high-capacity 21700 battery provides significantly more energy for extended outdoor activities, camping, searching, and emergency preparedness.

Unlock Up to 2,800 Lumens and 740m Throw

When equipped with the TB217 extension tube and a suitable high-discharge 21700 battery, the SPERAS M4 V3 can achieve improved maximum performance.

• Maximum Output: Up to 2,800 lumens

• Maximum Beam Distance: Up to 740 meters

• Maximum ECO Runtime: Up to 500 hours with a 5000mAh 21700 battery

These performance figures apply to the compatible M4 V3 flashlight with the specified battery configuration, not to the extension tube alone.

Extended Runtime for Outdoor Adventures

The larger battery capacity makes the TB217 particularly useful for users who need longer operating times between charges.

With a compatible 5000mAh 21700 battery, the M4 V3 can achieve up to 500 hours of runtime in ECO mode, making the extended configuration suitable for longer camping trips, outdoor exploration, and emergency lighting.

Precision-Machined Aluminum Construction

The TB217 is constructed from 6061 aluminum alloy with a Military Type III hard-anodized finish, matching the durable construction of the SPERAS M4 V3.

Its textured exterior provides a secure grip, while the extended body length offers improved handling, particularly during extended use or when wearing gloves.

Easy Installation

The TB217 is designed as a direct replacement for the original M4 V3 battery tube.

Simply remove the original short tube, install the TB217 extension tube, and use a compatible 21700 Li-ion battery.

No complicated modifications are required.

Key Features

• Designed specifically for the SPERAS M4 V3 flashlight

• Converts the original 18350 battery configuration to 21700

• Supports up to 2,800 lumens with a compatible battery

• Extends maximum beam distance to 740 meters

• Up to 500 hours of ECO runtime with a 5000mAh 21700 battery

• Precision CNC-machined 6061 aluminum alloy

• Military Type III hard-anodized finish

• Textured surface for a secure grip

• Longer body for improved handling

• Direct replacement for the original battery tube

Specifications

Performance figures refer to the SPERAS M4 V3 flashlight equipped with the TB217 extension tube and a suitable 21700 battery. Actual performance depends on battery specifications and operating conditions.

Compatibility Notice

This product is an extension tube only, not a complete flashlight.

Designed specifically for the SPERAS M4 V3. Compatibility with earlier M4 versions or other SPERAS models is not confirmed.

A compatible 21700 Li-ion battery is required to use the extended configuration. The flashlight and battery are not included unless explicitly specified in the selected package.

SHIPPING
The final shipping cost and estimated delivery timeframe will be available to you during checkout. Currently, we offer 3 International shipping methods which are steady and easy to track. Priority worldwide shipping, Premium ( Partial countries) and a faster Express shipping. The estimated times stated below are not guaranteed. An international package could experience delays like postal strikes or severe weather or Cov-19 situation. All shipping ways, PO Box address is not acceptable.

For some flashlights, there's a pure battery inside（phone charging）,If We can not ship your packages via USPS or DHL,we'll ship your package in another way.

Note:
When you place an order for just the batteries, for easy shipping, faster and safe delivery, the batteries are placed in the flashlights.

If you don’t receive your order within the estimated time frame provided below and suspect that it might be lost in transit, please contact Flashlightgo Support ( support@flashlightgo.com ) and we can look into the order with the courier. Lost-in-transit requests must be submitted to Flashlightgo Support within 3 months of the date of shipping or before the courier archives the tracking information.

Option 1.
Express by DHL/UPS/Fedex/Aramax/SF etc ( there may be tax need to pay in this way),
The estimated time of delivery is usually 3-7 work days depending on the country. Includes detailed tracking and confirmation of delivery.

Option 2.
Premium ( 6-10days, All tax and Duty Paid),
All tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

Option 3.
Priority shipping(1-2 Weeks, average 10 days)
If we marked it is with all tax and duty paid, all tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

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To ensure that you get the desirable product, we allow a seven-day product return period. Any product return application outside this period will not be entertained.
All returned product must be unused and the original package should be kept.

Return：
We do not offer return for personal products like socks and hats or food, magazine and fragile or dangerous products The original receipt must be available for application of return.

Discount products：
No product return for discount products

Gifts products：
If the item is marked as a gift when purchased and shipped directly to you, it cannot be exchanged , refunded or warranty.

Exchange：
We only replace items if they are defective or damaged.
Exchange service are offered only to wrong deliveries or product damage not caused by client. If needed, please email to info@flashlightgo.com.

Warranty
How long is the warranty period?
Flashlightgo warrants to the original purchaser that the Product(s) shall be free of any defect in material or workmanship for a period of one year for labor and one year for parts from the date of the original order except the items listed below:
Chargers,Batteries and Other Accessories: 3 months warranty

Should the Product(s) supplied by Flashlightgo prove defective because of improper workmanship or material as reasonably determined by us, Flashlightgo agrees, at its option, to either repair or replace the Product free of charge, excluding any shipping or handling charges.

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