If a boat's wiring is the lifeblood of your boat's DC electrical system, the battery is its heart. But unlike the battery in your car or truck, which is probably used (and charged) fairly frequently, boat batteries can sit dormant for weeks or months at a time, which can lead to a dead battery when you want to use your boat. In fact, TowBoatUS cites dead batteries as one of the top 5 reasons boats get towed. Scroll down for the most common questions asked about boat batteries and to learn everything you need to know to keep them ready to power up when you are. You’ll also learn critical information about DC shore power, both aboard and at the dock.