Just plug it in. Included is a micro USB cord that charges your flashlight simply and conveniently like your other devices. No need for costly batteries that can get lost or take up space. Charge it before you head out, use a car charger on the way or use a charging station while you're out and about. It's environmentally friendly, convenient and easy. You don't give up any power or lumen output with the 18650 Li-ion battery, just the hassle of buying expensive batteries each adventure.
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