Nitecore Extension Battery Case w/ USB Power Bank Function (for NU40/NU43/NU50 Headlamps)

The Nitecore Extension Battery Case is a charging case built specifically for headlamps. 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. Weighing less than three ounces, its well-balanced design provides an optimal weight distribution to the user for a comfortable and secure wearing experience. The Extension Battery Case is compatible with high-capacity 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. Features Connects directly to headlamp Can charge a headlamp's built-in battery while the headlamp is on Lightweight and well-balanced design Four red flashling lights can alert others in your surroundings Power indicators to let you know when it's time to charge Specifications LED: ~ Maximum Brightness: ~ lumens Peak Beam Distance: ~ yards Peak Beam Intensity: ~ cd IP Rating: ~ Impact Resistance: ~ m Input: 5V ~ 2A Output: 5V ~ 2A Battery Option: 18650 Li-ion Battery (Flat Top Excluded) Brightness & Runtimes: Turbo: ~ / ~ High: ~ / ~ Mid: ~ / ~ Low: ~ / ~ Ultralow: ~ / ~ Strobe: ~ / ~ Dimensions: L-4.17"xW-1.57"xH-1.38" Weight: 2.29oz Includes Nitecore 18650 Extension Battery Case Cable Clip (Battery sold separately)