Marine Batteries

Our premium selection of sealed lead acid (SLA) Marine Batteries include LifeLine, Braille and Universal Power Group. We can ship direct to your door or to any facility you are docking your boat at for service and installation. If you are unsure which size battery you should be purchasing consider using our marine battery selector to assist in your search. Impact Battery also has a large selection of waterproof, multi-bank boat chargers.

Starting Batteries vs. Deep Cycle Batteries

On the outside there really is no difference in appearance besides maybe the terminal type. However, once you get past the raw materials of the plastic case, lead, AGM material, and acid there are some fundamental differences.

Deep cycle batteries used in bass boats and speed boats as well as other applications such as RV's and golf carts are designed to provide a constant current over an extended period of time. To maintain the ability to supply power over longer periods of time the plates are made thicker. This initiates the deep cycle nature and allows discharge of up to 80% of their capacity routinely. They still have the ability to provide a short but less powerful burst of power compared to a similarly sized car battery, but this is not their primary function and is more like a byproduct.

As the name suggests, marine starting batteries are designed to turn over an engine by providing a high rate of current over a very short time period. These batteries cannot handle continuous load deep discharge situations. They will leave you wanting and will die a premature death when used for applications other than starting an engine. To achieve the necessary burst of current these batteries need lower their internal resistance. This is accomplished by using thinner lead plates.