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Anker Super Bright Tactical , ( Battery Included), Zoomable, IP65 Water…

2 x T6 LED Zoomable . Power Source: 3 AAA or 1 Batteries. Runs on 2 batteries. Lens: Coated Glass Lens.

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

Amazon.com: 18650 rechargeable flashlight

rechargeable flashlight 18650 | eBay

18650 Rechargeable Batteries – Walmart

18650 – Fenix Flashlights