What is the difference it makes to run a 6 vs 9 volt? Could one or the other harm the ignition? I’d love to try something that will last awhile too.
I don’t think so but except for my little test I’ve always used a 6 volt battery. Years ago I heard of people using 7.5 volt drill batteries. Remote controlled car batteries is another option I have heard of people using.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.