So we need batteries that can meet the demand until they can be recharged. All of these activities drain the batteries, but nothing is replenishing them until the engine is run, or the vessel is plugged into shore power and the battery charger turned on. It may spend long periods at anchor, on a mooring or slip, with the engine not running, but you may still want to have the cabin lights on, run the stereo, perhaps even watch TV. The starting battery only has to give a big jolt of electrical power for a very short time.Ī boat is very unlike a car with respect to the electrical demands placed on it. The battery is there simply to crank the engine, then as soon the as the motor is running, all the electrical demands are satisfied by the alternator on the engine, which also recharges current drawn from the battery. As a rough guide, a light to medium duty battery will be good for about 200 to 300 cycles, while a heavy duty battery should easily be able double that amount of useful cycles with no ill effects.Ī starting battery is the type you have on your car. A cycle is the term given to a battery that discharges through use and is then bought back up to full charge again. Batteries fall into one of two categories, deep cycle or starting. There's more to equipping your boat with batteries than you might think. But what should you choose? You would think that you could just walk into your local marine store and buy any battery that fits in the boat, right? Wrong. So, the batteries on your boat have come to end of their life, and you need to buy new ones.
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