Nitecore Extension Battery Case for NU40/NU43/NU50 Black

Nitecore Extension Battery Case for NU40/NU43/NU50 Black. The battery case connects directly to the headlamp guaranteeing long-lasting illumination and stronger brightness. When connected to the Nitecore NU40 the NU43 or the NU50 the headlamps will automatically go into Performance Mode creating a better lighting experience for the user. 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. Weigh