Starting Batteries
Much similar to automotive batteries, starting batteries supply an enormous amount of current for a very short period. However, these batteries like to be recharged almost immediately and don’t do well with deep discharges. Starting batteries are idyllic for use as a single battery for runabouts, small water-crafts, and boats with minimal DC loads.
Deep Cycle Batteries
These are the most popular marine batteries because they can endure repeated recharging and deep discharging without any damage. They are appropriate for fishing boats, sailboats, and private boats with much larger DC power requirements. Any battery that is intended to power on board DC loads such as lighting, inverters and trolling needs to be a good quality deep-cycle battery. The norm for most boat owners is usually to have a dual-battery system with one starting battery and one deep cycle battery.
Dual-Purpose Batteries
These batteries are the perfect compromise between functionality and durability. They work extremely well and will tolerate rampant charging and discharging. However, due to their lower storage capacities, boat owners are advised to couple two batteries up and use them interchangeably for starting and on board electric loads.