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Returning to a simpler idea:
A small bent plate (very small - a piece of card stock may work) slightly bent so that when a bit or zip backs onto it, the weight of the rear wheels rocks it backward, lifting the charging contacts (like slot car pick-up shoes) into the charging points on the bit. It could be very small and very simple. The weight of the bit would lever the charging contacts into place. Then when you want to leave, you just mash the go pedal.
The scale of the drawing is very wrong, as I had to just throw it together as a concept drawing. Very light wire could be used to power the contacts, which could be left on. No energy would be lost unless they were shorted, or if a car pulled up to charge.
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