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.

Piece of crap spent 150$ on flashlight didn't work after 1 year of virtually no use sent back flashlight was strobing non stop when turning on they said they couldn't replicate problem said probably. was the battery got new battery still not working it was just a couple of days over the 2 year warranty

This thing is bigger than I thought when purchasing. Fit and finish is superb, but the on/off of the tail cap feels a little flimsy. I will see how it holds up over time. Disappointed that it stated in the description that the turbo setting would last for over an hour but the temp sensor ramps down the turbo setting after about 30 to 40 seconds. I like the idea that it can be used as a power bank.

The TH20 Guardian is a very nice light that makes a nice compliment to my Jetbeam PC20. The 21700 battery holds a charge well, provides plenty of light and is compatible with both lights. Light is solid, and Jetbeam quality is evident. I liked it so much, I bought a second one for my wife. It would be nice if it had an adjustable beam. Other than that, it comes with everything needed to put into use right out of the box.

Very bulky and large for what said performance was. Once you discover how to access turbo setting, you find out it only last 20 seconds then shuts completely off.
Rear toggles are nice and simple for setting brightness and 2 separate toggles are for strobe.
Its more of a flood than a thrower.
It is bright, but I seriously doubt their claim of 3980 lumens. I'd rather have a light with less lumens that last longer on that brightness setting.
I ended up returning it and exchanged it for a smaller bundle set. Battery Junction handled everything very smoothly and I'll keep buy from them!