Hi Ron, Kelly,
You are both right...except you are not discussing the same circuit. Ron is referencing the JetCat ECU, and Kelly is referencing the PST TEMS (GB Hobby) TCU. These are two vastly different circuits that do essentially the same thing, control a turbine. The ECU will remain off without Rx power applied, while the TCU will drain its battery if the switch is left closed. The switch as it is wired is a DPDT and does give the redundance of using both poles to switch only the positive line. JetCat has decreed that using a switch in the system is not allowed, while the GB system makes very good use of a switch. Personally I removed the switch as a another potential failure eliminated, but I made sure to disconnect the battery post operation. Hope this clears it up a bit...