Best Deep Cycle Batteries for Trolling Motor

Best Deep Cycle Batteries for Trolling Motor
Best Deep Cycle Batteries for Trolling Motor (Image: © Sea N Swim)

A trolling motor is essential to a fisherman’s boat, especially for those who want a peaceful and hassle-free fishing experience. However, choosing the right deep cycle battery for your trolling motor can be daunting. With so many options available in the market, it can be overwhelming to make an informed decision. This article aims to help you choose the best deep cycle battery for trolling motor based on your needs and budget.

What is a Deep Cycle Battery?

A deep cycle battery is a unique kind intended to withstand multiple rounds of discharging and recharging without damaging its internal parts. Unlike starter batteries that deliver a sudden surge of power to start engines, deep cycle batteries provide a consistent and continuous power flow over an extended duration. These batteries are widely used in various applications, such as trolling motors, recreational vehicles (RVs), and solar power systems.

Types of Deep Cycle Batteries:

There are three main types of deep cycle batteries to consider when choosing the best battery for your trolling motor:

Flooded Lead-Acid Batteries:

The most common type of deep cycle battery is a “flooded lead-acid battery.” They are easy to find, affordable, and work well. But you need to take care of them by adding water to the battery and regularly cleaning the metal parts ( terminals ).

Absorbent Glass Mat (AGM) Batteries:

AGM batteries are a special kind of battery you don’t need to take care of too much. They cost more than flooded lead-acid batteries but last longer and are stronger. You don’t have to worry about them leaking; you can put them in any position you want.

Lithium-Ion Batteries:

Lithium-ion batteries are a new kind of deep cycle battery. They cost more than other batteries. They are light and last a long time. They only need a little upkeep. They charge quickly and hold more energy than other batteries. But they are the most expensive choice.

Why Do You Need a Deep Cycle Battery for Your Trolling Motor?

A trolling motor needs a particular battery to power it for several hours. This kind of battery is called a deep cycle battery. It’s not like the battery in a regular car that only gives a quick burst of power to start the engine. The deep cycle battery provides a steady amount of power for a longer period, making it perfect for trolling motor use.

Understanding Amp-Hours:

When buying a battery for your trolling motor that will last a long time, you should consider its “Amp-hours” (Ah). This is how much energy the battery can provide over time. If a battery has more Ah, it will work for a longer time before you need to recharge it.

For example, a battery with a rating of 100Ah will last twice as long as a battery with a rating of 50Ah, if you use them both similarly.

Factors to Consider When Choosing a Deep Cycle Battery for Trolling Motor:

There are several factors to consider when choosing a deep cycle battery for your trolling motor. These include:

Battery Capacity:

Battery capacity is measured in amp-hours (Ah). A higher amp-hour rating means the battery will last longer. So, when choosing a battery for your trolling motor, pick one with a good amp-hour rating that can power your motor throughout your trip. Remember, this is important because you want to stay in power while on your journey.

Battery Type:

There are various types of batteries called deep cycle batteries. These include flooded lead-acid batteries, sealed lead-acid batteries, and lithium-ion batteries. Each kind of battery has its benefits and drawbacks. Flooded lead-acid batteries are the most common and usually the cheapest option but not well option compared to the other batteries. Sealed lead-acid batteries don’t require any maintenance and don’t need water to be added. Lithium-ion batteries provide the most energy per unit and last the longest, but they are the most expensive choice but recommended.

Battery Voltage:

The power of a battery depends on its voltage. Trolling motors need a 12, 24, or 36 volts battery. You should pick a battery with the right voltage for your motor.

Battery Size and Weight:

When selecting a battery for your boat, consider its size and weight. If you have limited space, a smaller battery may be more suitable since it’s lighter and easier to handle. However, a smaller battery may not provide enough power if you have a bigger trolling motor. Therefore, it’s crucial to find a battery that fits your requirements in terms of size and weight.

How to Maintain Your Deep Cycle Battery for Trolling Motor:

Proper maintenance is key to ensuring the longevity and performance of your deep cycle battery. Here are some tips for maintaining your battery:

  1. Make sure to fully charge your battery after use to prepare for your next trip.
  2. Keep your battery in a cool and dry place when you’re not using it. Heat and moisture can harm it.
  3. If you have a flooded lead-acid battery, check its water levels often and add distilled water as needed.
  4. Clean the battery connections regularly to prevent corrosion. You can use baking soda and water to clean them and a wire brush to scrub off any corrosion.
  5. Use a charger/maintainer designed for deep cycle batteries to keep your battery charged and ready to use.
  6. Check your battery regularly for any signs of damage or wear. If you notice any problems, fix them immediately to prevent further damage.

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Frequently Asked Questions

How long will a deep cycle battery last?

The lifespan of a deep cycle battery can vary depending on factors such as usage, maintenance, and the type of battery. AGM batteries tend to have a longer lifespan than flooded lead-acid batteries.

Can I use a car battery for my trolling motor?

It’s not recommended to use a car battery for your trolling motor. Car batteries are designed for starting engines and unsuitable for deep cycle use.

How do I know if my battery is fully charged?

You can use a battery charger with a built-in voltmeter to determine when your battery is fully charged. A fully charged 12-volt battery should read around 12.6 volts.

How often should I replace my deep cycle battery?

The lifespan of a deep cycle battery can vary, but most batteries will need to be replaced every 2-5 years, depending on usage and maintenance.

Can I use a solar panel to charge my deep cycle battery?

Yes, a solar panel can charge a deep cycle battery. It’s important to choose a solar panel designed for deep cycle batteries and to size the panel for your battery’s capacity properly.

Moses Vaughn
Hi, I'm Moses Vaughn, the founder of, and I'm passionate about all things swimming. As an avid swimmer myself, I've spent countless hours exploring the sea and perfecting my technique. I understand the challenges that come with sea-based activities and have developed a line of products that can help you overcome them. My products are designed to cater to swimmers of all levels and are built to withstand the harsh conditions of the sea. Whether you're a beginner or a professional, my products can enhance your swimming experience and help you achieve your goals. Through, I aim to share my knowledge and experience with other swimmers and provide valuable insights that can help them improve their skills. So, feel free to explore the site and discover everything you need to know about swimming and sea-based activities.