RE: Cheap and Simple ideas that work
Old method: I plugged the ECU battery in via a deans plug to a charging jack & through a double pole switch to the ECU.
New method: Fitted the plug straight to the ECU & just plug the pack in to turn it on.
Not a great money saving but I eliminated the switch, charge jack & a heap of wiring. I changed plugs to the Sermos type as they are easier to plug/unplug. - John.