M4 Extension Tube (For 18650 Battery)
M4 Extension Tube (For 18650 Battery)
M4 Extension Tube (For 18650 Battery)
M4 Extension Tube (For 18650 Battery)
M4 Extension Tube (For 18650 Battery)
M4 Extension Tube (For 18650 Battery)

M4 Extension Tube (For 18650 Battery)

"Not only does it make it easier to hold, pair it with the latest 3500mAh capacity 18650 batteries and you can 3x the runtime from 1 hour to 3 hours." - MJ

Designed to fit the Speras M4, so you can use a larger 18650 battery to increase runtime by up to 3x.

Regular price$7.00
Tax included.
  • 100% No-Risk Money Back Guarantee
  • Door to Door Delivery + Easy Returns
  • Dedicated After-Sales Support
  • Street Safe Video Workshop ($388 value, FREE)

3x your runtime for longer ops and use

Making it a true compact searchlight that far outshines other lights of similar sizes.

  • Made for Spearas M4
  • 1pc is enough to fit a 18650 battery
  • 3x your runtime with a 3500mAh 18650 battery
  • Easy screw in installation
  • Extends handle length for better grip


Turbo 1320
1h10min 652m
106,400 cd
1h15min 387m
37,500 cd
Medium 220 2h 261m 17,000 cd
Low 60 7h45min 130m 4,250 cd
ECO 0.5 220h 17m 75 cd
- -


ANSI/PLATO FL 1 2019 Standard is a set of flashlight performance guidelines that confirms the light you're buying has been tested to spec, and you're not buying into false performance claims.

About SPERAS (Not Nitecore)


Speras is a visionary brand driven by a passion for innovation and a commitment to providing cutting-edge flashlight solutions for adventurers and professionals alike.

What's In The Box

  • 1x M4 Extension Tube
  • 2x Spare O-Ring
  • 18650 batteries NOT INCLUDED

Our 60-Day Ironclad Guarantee

We believe in this product so strongly that we're giving you a 60 days money back guarantee!

If you're not 100% satisfied with your purchase, ship the entire package back to us with your Order #number and we'll give you a full refund!

What happens after payment?

  • You'll receive a purchase receipt via email after payment.
  • Your order will be processed within the next working day and we'll email you a tracking number once your package has been shipped.

When will I receive my lights?

  • Local shipping will take 4-6 working days to your door via courier.
  • International shipping will take 10-14 working days.

Returns and warranty

  • If our lights don't work the way they should, let us know and we'll do our best to get you sorted. 1~3 year replacement warranty.

Do you know that we can deliver same day, and have a large selection of lights for every need?

If you can't find what you are looking for, or need them on a specific date, do reach out to our team and we would be happy to assist you!

Love this? Then you also may like:

Recently viewed