I soldered in the old school 9.6 end in line. Then cut small hole in side of battery box then epoxy it sticking half way out. The plastic part of the connector is what is epoxy to the box it self. Then a bit of rtv on inside to seal out water. As long as you stay out of salt water and don't put anything conductive inside connector. Should be fine. Only way you could short is doing something dumb. Like shorting it out intentional. Lol. You will need to clean out connector before charging with air compressor. Or could get creative with like a small vacuum line cap or something similar to cover connector if u are worried. Works great tho.