Long story short. I have a Civictor V1 that was modded with a Seoul P4. It was used heavily for months using NiMh batteries and worked great. One day it was dropped and refused to light up again. It's been sitting on my workbench for awhile now and after seeing this thread, decided to try a 14500 in it. It fired right up! Pretty bright too! I've let it run for 5-10 minutes at a time a few times and except for getting a little warm (expected) it seems to work fine. It still won't fire up on 1.5v though.I can't believe no one has ever tried a 14500 in a civictor. I guess I just have to buy one and try it.