L35 2.0 battery and cigar grip question

I'm on the verge regarding buying Acebeam L35 2.0

I've been looking for a nice discount for this light and current Black Friday deal seems really nice, but there's one thing that I read here trying to get to know the light better

Is it true that the unprotected 21700 cells are too short to work with it?
Also is it possible to get rid of the cigar grip (the wide ring at the back of the light)