Saw a post about trying to find a way to charge battery with out removing. Pretty straight forward on how to do it. Solder in a pig tail end to battery side of switch. I used an old 9.6 end. Cut out small hole for connector. Epoxy in and some RTV on inside of battery box to keep it water proof. Little bit of brake clean occasionally to help clean but mostly just used compressed air. Been about 3 years now. No problems.