Nearly a car ;-) you can get via a well know auction site a usb adaptor that actual plugs into the charging point on the mobility scooter, so no need for relays / grounding etc.
(need to check with supplier this will fit with the mobility scooter you are looking at)
https://www.ebay.co.uk/itm/332873999101
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In a completely sane world, madness is the only freedom (J.G.Ballard).
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