The 21700 rechargeable lithium ion battery is the perfect power source for this Jetbeam TH20 Guardian. It's also easier to use. Main button will activate the last used brightness mode. While on, double click either paddle for Turbo. Really cool User Interface! Long runtime with the 21700 battery. The light itself is USB-C rechargeable, and can even be used as a powerbank! Amazing technology!

Also, the service from Battery Junction is superb. Even though I pre-ordered it over Memorial Day to take advantage of the storewide sale, this brand-new light was shipped quickly to me the very next day they received it in stock. I was kept aware of the date for expected shipping, the actual date, and sure enough Battery Junction shipped it on that date.

I highly recommend purchasing your latest and greatest rechargeable flashlight from Battery Junction. They are very dependable and reliable.

Excellent Quality and good features

The light is bright but I definitely question the claim of 4000 lumens. The increase in brightness between the 1500 lumen out put and 4000 lumen output isn’t super impressive. The sill is very flood like with no discernible hot spot. Intensity at distance is mediocre given the lumen rating. The instructions that come with the light do not mention how to activate “turbo” mode. I had to do an internet search.

Expensive yes but this is a high quality flashlight that will last for years. It's also the brightest flashlight I've ever owned...amazing & powerful beam of high quality light. It's a pocket full as it was larger than what I imaged it to be but it's with me anytime I venture outdoors. I sincerely think anyone who buys this flashlight will never regret it...it could also be one of the best gifts you could give to anyone. It does need a charger capable of 4.20V or the green charge light will never come on. Hope this inspires anyone looking for a great flashlight.

Well made light. With the 21700 battery this light can really throw the Lumens. Simple controls and nice size light. With USB-C and a power bank feature; really can't go wrong with this light. This light hits all my "wants" in a reasonable size tactical light and outdoes many larger and more expensive lights. Sale price for Black Friday made this even a better deal.