Sorry Madog I took your idea! I had to reposition the main PCB board in order to do it, but I extended it inside the cylinder to fit an 18650 2500mah battery. It's all ready to go, as soon as my charger gets here this thing should be smokin like crazy. I'm expecting this battery to last a long time without a recharge. I'll keep you posted.
Parts needed:
old battery connector
3.7v 18650 battery
large washer
switch
time
Parts needed:
old battery connector
3.7v 18650 battery
large washer
switch
time