Rechargeable CR123 for L1?

It's pretty hard to get a 3.7V RCR123 into an L1 body, the body opening is constricted in diameter a bit and rechargeable cells seem to be a bit fatter than primaries.

However I think I've heard of folks getting 3.0V rechargeable cells in there and having them work fine. Maybe some of the 3.0V cells are skinnier?

I've had a cree L1 head on an E1 body running with a 3.7V RCR123 cell. It was unregulated and considerably brighter (I'd say overdriven), but it didn't go :poof:
 
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