If it takes an 18650 you should be able to stack CR 123 you will definitely have to make sure you apply ample amount of juice to keep the atty wet, and definitely don't use LR atties.
I haven't tried the Reo Grand, but have had a few 18650 mods.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.