The Nitecore Extension Battery case features an 18650 li-ion battery and can be connected directly to your headlamp.

Compatible with the NU40, NU43 and NU50, the extension battery charger offers continuous power for various activities including trail running, climbing, hiking and so much more. The extra power allows the user to tackle a 100km trail run comfortable in the knowledge they have sufficient power.

When connected, the headlamp will seamlessly activate the performance mode. This mode is purposefully designed to regulate the rate of brightness reduction in the headlamp, ensuring a more stable output over time.

The extension battery case will at first power the headtorch whilst simultaneously charging the headtorch's built-in battery, allowing it to work to its full potential. With its USB-C input and output, the battery case can also be used as a versatile power bank for other electronic devices.

A four power red flashing indicator helps keep the wearer safety at night.  A blue power indicator allows the wearer to know when its time to recharge the extension battery case.