Panasonic NCR + Olight M3X?

Has anyone tried using this battery:
http://www.intl-outdoor.com/panasonic-ncr18650a-3100mah-protected-battery-p-333.html

with the M3X? They don’t work for me. I can get light if I remove the tailcap and measure amps with a meter. Are they too long?

Trustfire flames work fine. I’m new to the nicer batteries, so It’s possible I’m doing something stupid. Both batteries work in 1X18650 lights.