KL4 on One Cell-Output and Runtime?

Maybe this post will contain my text! I like my KL4 head on my Vital Gear 1 cell body--a tiny pocket flood machine. Anyone have any data on output and runtime using one Surefire battery with this setup. Could not find anything in search. Thanks!....Jeff.

AFAIK, you'd need to use an RCR123 to drive this to the max.
I don't think a std. CR123 would be as bright.

With a freshly charged RCR123 you can expect the 100 lumens output
that is normal for a KL4. This output will drop off once the RCR123 is
drained and starts losing voltage and current.

I think the runtime with an RCR123 is about 25 minutes but it won't
be at full brightness for the whole time.

They call this arrangement (of a KL4 on a 1-cell body) a TW4
(after Tactical Warehouse)

If you do a search on TW4, I think you'll pick up a lot of the information
you are seeking.

Thanks Easilyled. Just the information I needed. I'll keep carrying my little flood baby, but realizing it won't light for me all night long.....Jeff.

Google TW4 for lots of info on this one.