Being somewhat new to battery R/C, I am still trying different things as far as switch and charging port locations.
Having some delicate powered units I do not desire to remove them from the track for switching or charging purposes.
My favorite access is under the water fill lid on a tender. Push buttons on the angled face of a chamfered fuel tank, a discrete mini toggle just behind a brake shoe hanger. 2.5mm port tucked into the inside void of a fuel tank.
At this point none of my R/C units need to be lifted off the track for on/off or charging purposes.