Millertech Sport Series batteries are built with marine use at the top of our minds. Yes, they’re waterproof, but they aren’t submersible, and they aren’t made for direct spray over long periods. Every Millertech marine battery is sealed with a rubber gasket. The stainless-steel breather vent sits on top of the case, where rain and dirt can’t collect, and lets air flow to prevent condensation. If your compartment floods, pump it out right away. If you have any doubts about your batteries afterward, call our Support Team at 855-MAX-LITH.