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Product Description. The HC90 is a power featuring lumens. Purpose designed for mountaineering, hiking, camping and general out of doors recreation.

OSRAM Waterproof 3000 Lumens LED Head Torch , Frontal LED w/ 18650 Battery 3.5mm charge port.

Compare to similar items. This item Nitecore HC90 XM-L2 LED (-Lumens).

Nitecore HC90 – Powerful – Lumens – for Hiking, Backpaking, Camping, Trekking and Outdoors – 110mts Throw – Powered by 18650

Fenix HP25R LED 1000 Lumen , Spotlight Flood-Beam Red- with 18650 Battery and LegionArms USB charging cord.

https://en.wikipedia.org/wiki/Rechargeable_battery

Amazon.com: rechargeable headlamp flashlight

flashlight headlamp rechargeable | eBay