Hydrogen and charging. Drill holes to pass the wires through. Seal the holes with caulk or silicone. Run a sealed pipe to the outside.
Thinking about this I don’t think a sealed pipe will do much. Without airflow (an exchange of air with in and outgoing venting) the gas generated will not go anyplace.
Lead acid batteries should be outside; hydrogen is just too dangerous to be in the living area of a home.