|Application||Deep Cycle||Dual Purpose||Starting|
|Trolling Motor||Deep Cycle Recommended for Trolling Motor||Dual Purpose Recommended for Trolling Motor||Starting Not Recommended for Trolling Motor|
|Live Well Pump||Deep Cycle Recommended for Live Well Pump||Dual Purpose Recommended for Live Well Pump||Starting Not Recommended for Live Well Pump|
|Fish Finder||Deep Cycle Recommended for Fish Finder||Dual Purpose Recommended for Fish Finder||Starting Not Recommended for Fish Finder|
|Deep Cycle Not Recommended for Inboard/Outboard Motor||Dual Purpose Recommended for Inboard/Outboard Motor||Starting Recommended for Inboard/Outboard Motor|
|Marine Lights||Deep Cycle Not Recommended for Marine Lights||Dual Purpose Recommended for Marine Lights||Starting Recommended for Marine Lights|
|Communication Radio||Deep Cycle Not Recommended for Communication Radio||Dual Purpose Recommended for Communication Radio||Starting Recommended for Communication Radio|
Deep cycle marine batteries feature a heavy charge and discharge cycle, making them perfect for long-lasting power on fishing boats, kayaks, and any other watercraft using a trolling motor or electric motor.
If you're operating a live well pump, depth finder or fish locator, a deep cycle marine battery generates the reliable, durable energy you need.
Deep cycle, or deep cell batteries are designed with fewer, but thicker plates, which means they can be discharged at a consistent rate for a longer time, at a higher depth of discharge.
It also means they can withstand high temperatures while providing high electrical currents. Deep cycle boat batteries can be drained and recharged many times; starting batteries can’t. That’s why they’re typically used to power electric motors, and other applications, too.
Note: Deep cycle batteries come in both AGM and lithium chemistries.
Looking for something that does a little of everything? At the mid-point between starting and deep-cycle batteries you’ll find dual purpose batteries.
Dual purpose marine batteries provide the strong starting power you need for your engine, as well as the cycling capacity to keep your accessories running smoothly.
Look no further than the name. If you’re looking to save money and space, consider replacing two batteries with one. It’ll power your boat’s engine and all of your on-board applications at the same time.
Please note that dual purpose batteries are recommended for small-midsize boats that take shorter trips on the water.
Dual purpose batteries, while convenient, don’t offer the cranking amps of a dedicated starting battery or the same depth of discharge as a deep cycle battery.
Starting batteries provide the fast, strong power you need to take your boating adventures to the top. These batteries are best for powering an inboard/outboard motor, as well as accessories like marine lights and radio communications.
Similar to a car battery, a boat starting battery provides a short, powerful burst of cranking amps to the engine when the key is turned, which then turns over your boat’s engine.
The marine starting battery design features a wider surface to accommodate thinner plates, enabling it to provide high currents.
Starting batteries tend to have a relatively low capacity, but that’s all they really need to start the boat’s engine. And when the engine alternator kicks in, the starting battery is charged back up to its full capacity.
While their wide design is perfect for providing the initial cranking amps, it also limits these batteries’ capacity and depth of discharge.
Starting batteries should only be discharged at a small percentage, and shouldn’t be counted on to power on-board applications or as a trolling motor battery.
The answer to this question largely depends on the type of charger that you have. Many newer chargers are "smart" meaning they will constantly analyze the battery state as it's charging and automatically change the charging mode to match the needs of the battery. These chargers will shut off when a charge is not needed and is completely safe to leave connected.
If you have a charger that is not automatic you will want to plug in the charger and leave it plugged in until the battery is charged. As soon as the battery is fully charged you will want to disconnect the battery from the charger to prevent unnecessary damage to the battery.
Generally speaking, your batteries should be "fully charged" at all times if possible. The worst thing that you could do is come home after a long boating day and let your used batteries sit. Ideally, you will want to fully charge your batteries at least once a month to ensure a long life. Using an automatic charger is a foolproof way to ensure batteries stay charged and ready. Plug in the charger after every trip and let it do all of the work.
Need to replace the battery in your boat? Find out which battery brands last the longest, recharge the fastest and perform the best on the water. Plus, get a breakdown of the boat battery warranties available at Batteries Plus.
Looking for the best battery for your car, truck or boat? Batteries Plus' exclusive brand X2Power is the superior choice. These AGM batteries last longer, recharge faster and stand up better to vibrations and extreme temperatures.
Need a charger for your boat? Learn out how to find a charger that's compatible with your boat's battery chemistry and voltage. Plus, get tips on proper battery charging and recommendations on some of our best marine chargers.