They are looking good mark! I love my chuck too, although that 5volt box mod has been my favorite for the last week or so. The Goldrush might be on the list though.first of all, I love my Chuck If you're familiar with the chuck, the 18650 goldrush tube is about the same length as the chuck but maybe 1/4" bigger in diameter.
The Blue lightning tube is defintely bigger than comparable 14500 mods but not clown shoe like bigger. Still pretty comfortable in the hand.
Tomorrow I'll try and get some pics up with batteries for comparison.
hoog