I have been searching around to stop using expensive CR123A batteries in some of my torches.
I read about a couple that I have and tried it out and both of these two work well if you want a lot more light but reduced runtime.
You can always keep some spare RCR123s properly boxed in your pocket or bag if the light runs down too low.
The only thing is to use the RCR123s on HIGH in your torches for short periods of about 5 mins.
But because you have a higher high level you can use the boosted Medium level most of the time and then you still have a boosted High for extra brightness when needed.
It is higher output vs higher runtime basically.
The Klarus XT11 puts out 600 lumens on an 18650 and around 800 lumens when running two RCR123s.
The Olight I1 puts out around 260 lumens on a single CR123A and around 440 lumens when running an RCR123A.
This is a lot of light for such a small torch that can fit in your fob (spare coin) pocket.
I have noticed that the Stainless Steel version I1 runs hotter than the black aluminium (aluminum for yanks) version.
I have been running them this way with no problems as long as you wisely use the High mode.
But what a difference the output is when using RCR123s in these two torches.
You can’t do this in bigger lumen torches because the working current is too much for RCR123s to handle.
RCR123s depeding upon brand and chargers can usually handle around anywhere from less than 1000 ma up to 1300 ma if they are of very good quality.
I am talking milliamps here not milliampere hours in the last sentence.
Cheers