My Fenix TK75 is the best go-to light in my collection.
If it had a way of recharging the batteries from an external plug it would have been the ultimate to my way of thinking.
I know there is the rechargeable Fenix RC40 with its propriatary battery pack but I have felt it and it is a lot more heavier and cumbersome than my TK75.
The issues surrounding sealed battery units like those used in the Olight SR90 - SR95 series that I have some of brings about many divided thoughts and opinions.
I think I can buy one of the the Supbeam K40 or whatever it is that has the rechargeable battery carrier setup and swap it to some of my Thrunite TN30 and TN31 lights but they only put out around 1000 lumens as against about 3000 using the TK75.
My friends that are not familiar with Lithium Ion battery usage would love my TK75 if it had a dock or external plug to charge it up and so would I, even though I have heaps of Lithium Ion batteries, chargers and flashlights in my cupboard.
New stuff is coming out all the time so maybe my perfect go-to light will soon appear.
CHEERS