This was bought as a single cell - note the big inductor for buck circuitry. Nice flat pill top, single piece uni-body style and easy access to the pill top. Massively thick pill top I might add...
In this thread: https://budgetlightforum.com/t/-/24076, post #77 has stock measurements I made, post #86 has the prelim mod #'s and post #117 had final #'s, after the UCLp upgrade. My #'s may be a little high (optimistic?) but I use the very best cell I have, actually the Powerizer may be the best cell in existence - too bad you can't buy them anymore.