Marine batteries are specially designed with a durable, water-resistant build. Marine batteries can last anywhere between 2 and 10 years, depending on the quality of the battery, how often it's used, and how well it's maintained.

There are two main types of marine batteries: starting batteries and deep-cycle batteries. Starting batteries provide the starting power your boat's engine needs. Deep cycle batteries provide steady energy to keep your electrical equipment on board running.

You should avoid using a normal car battery in your boat. A car battery is likely not going to have the voltage or built-in protection your boat needs for safe, sustainable power. You might even risk damaging the battery or causing a hazardous chemical leak.