Marine or boat batteries are a specialized item. The type you need will depend on the use. If it is for cranking over the motor on your boat you’ll need the Marine Dual purpose battery which we have in several sizes depending on your inboard/outboard size. The dual purpose battery is both a cranking battery and an AGM so it will turn over your motor and run accessories. If you need extra power we also have several options for a separate house battery to run house accessories such as your fridge.