I have the Foursevens Maelstrom MMU-X3, and this is the only 26650 flashlight I have ever owned or used. I've been looking at some of the newer ones on the market. What are some of your favorites? What do you think are the pros and cons of usb-c rechargeable flashlights that use this same battery. Should I be looking at the 21700 flashlights? How do they compare with 26650 flashlights?