Very small for 6590 lumens! They made a light a while back with two side by side 18650s inside and that's what I expected on seeing the pic. But this is really an EDC pocket light the lack of waterproof seals is a minus. "Tactical" seems to be a marketing label since the UI is more EDC style and it says EDC right in the name:). Price is $109.95 on US Nitecore store. I didn't watch the teardown video (maybe later) so I wonder how feasible a diy battery replacement is.
I had to check the user manual to see the warranty is 24 months and after that, they can do repairs for a service charge. That seems worth mentioning in the review since it's probably the normal route to getting the battery replaced when needed.
Thanks for the review!