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Nitecore Extension Battery Case for NU40, NU43, NU50, and HC65 UHE Headlamps
Nitecore Extension Battery Case for Headlamps

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Price: $19.95

Availability: Usually Ships in 24 Hours
Product Code: ACC-NITE-186EBC

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1x Nitecore NL1836HP 3600mAh [Add $20.66]


NITECORE 18650 Extension Battery Case At-A-Glance

  • Connects directly to headlamp
  • Can charge a headlamp's built-in battery while the headlamp is on
  • Lightweight and well-balanced design
  • Four red flashing lights can alert others in your surroundings
  • Power indicators to let you know when it's time to charge

Included in the Box

  • Nitecore 18650 Extension Battery Case
  • Cable Clip
  • *Battery sold separately (Only compatible with 18650 batteries)

Power Extension for the NU40, NU43, and More

The Nitecore Extension Battery Case is designed to extend the battery runtime of the NU40, NU43, NU50, and HC65 UHE headlamps. When the headlamp is on, it will first be powered by the battery case, followed by the built-in battery of the headlamp allowing it to maximize its runtime.

Lightweight and Comfortable

Weighing only 2.2 ounces and directly attached to the headlamp band on the back, it provides a balanced weight distribution to the user for a comfortable and secure wearing experience.


The Extension Battery Case is compatible with high-capacity 18650 rechargeable batteries, excluding flat-top batteries. Equipped with an intelligent charging function, connect a USB cable to a USB-C adapter to begin charging the battery when not in use. For added safety, it features four red flashing lights to act as a signal light at night. Short press the Power Button for the power indicators to illuminate your remaining battery power.


Input 5V ~ 2A
Output 5V ~ 2A
Battery Option 18650 Li-ion Battery (Flat Top Excluded)
Dimensions L-4.17"xW-1.57"xH-1.38"
Weight 2.29 oz

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 2 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 Great addition to my NU50 headlamp! January 31, 2024
Reviewer: Ricky Oliveros from Canyon Lake, CA United States  
As a union Electrician Apprentice this extension battery case and battery package has helped me in a lot of dark situations. I use this everyday and just helps to light up my workspace without having to stop work and recharge my headlamp so often. Very happy with this product!

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  0 of 0 people found the following review helpful:
5 of 5 Extension Battery case in cold weather. December 16, 2023
Reviewer: B Witte from Fairbanks, AK United States  
Ever since Princeton stopped making one, this is the first headlamp battery system I’ve found that allows me to keep the battery warm in my hat and against my skin. Only used it a month, but is bright and long lasting at -20°F. No problems with the plastic parts at low temps.

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