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OK, first off, these lights are way over-hyped on ads, etc and no, it’s not some incredible flashlight that’s going to save your life, lol. But at $ 3 each, they’re great little lights for sticking in cars, toolboxes, etc. so you always have one handy. They use 3 AAA batteries, so could make use of those free 24-packs of Harbor Freight batteries if you have some laying around. They can also use a single 18650 battery if you make a small filler sleeve for it (easily made out of a strip of thin plastic from a soda bottle or something wrapped in electrical tape).