Read the cars manual on both cars , it will detail the possible procedureNeed to jump start my petrol peugeot from C350e but have read it may not be safe to jump start from an electric/hybrid car. Is this right ?
I wouldn’t do that if I were you. It is a dangerous game to play. Go get a jumper pack for £20 and save yourself a lot more should anything go wrong with the hybrid system in the Mercedes.