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)
Unsure how this would work. Using any external power source will power your servos/rx/fans/etc, but if the BEC is going bad just by itself, that will still leave the brain circuits without power and you are still left with a dead ESC.