I see how you put some heat shrink on the bullets. I could not put one on the positive terminal. The bullet is too close to the heat sink but the negative terminal has plenty of room .
Castle Neu 1520 on 6S LiPo Powered Gmaxx (Nitro Killer)
Predator with OS .21TM
Supermaxx with Mach .26
Revo with OS .18TZ
Kyosho ST-RR Conversion
Ofna CR with Tekin ESC/Motor (2)
don't worry....this is the only unit that i was able to do that....my 4 other one i can't put some heat shrink....but try this take a piece of hanodized aluminium and try to make a spark....ive try it and nothing....