Deep Cycle Marine batteries have thicker lead plates and are designed for heavy cycling and can be deeply discharged and recharged. They are ideal for operating a trolling motor, depth finder or fish finder.
Starting Marine batteries or cranking batteries are designed to deliver high power for engine starting (outboard and inboard motors) while also providing power to basic accessory loads such as marine lights and radios.
Dual Purpose Marine batteries provide both starting and light to moderate cycling. They would be ideal for use in a smaller powerboat using one battery for both starting and running moderate loads when the engine is turned off.