Saltwater can cause more corrosion than freshwater. Fortunately, the BlueTop has a maintenance-free, completely sealed case that eliminates corrosive damage that negatively impacts the battery’s performance. Also, you can mount it anywhere in your boat because it’s leakproof and with 16X the vibration resistance of traditional batteries it can handle the beating of pounding waves. They also have more power so you can run all your electronic gear and never have to worry about drifting out to sea because of a dead battery.