Charging cable????

Take a clean sheet or paper and a photo of the battery box and the area and design an exterior lug mount and routing. Measure and then find parts store or truck service that will make you a couple of batter cables with crimped on water proof lugs, Might take a bit of a search for the idea items but Tow Truck Drivers and Off Roaders use to make battery cables that ends extended through the grill an inch or so to jump off others or be jumped off, or supply power to electrical items when they camped out. look on line for what is currently available for battery cable ends and rubber covers if you want and design a first class puppy.