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Need diagram for 24 volt charger for my mobilty scooter from my car

Can anyone give me a cct diagram to make a 24volt charger from my car cigar lighter socket please. I carry my mobilty scooter in my car and it is very difficult to keep taking it out, or taking the battery pack off to bring it into the house to charge it so it would be a great boon to me if I could be charging this whilst drivng. I can make a pcb if I can get a cct. Grateful thanks in anticipation. Tony