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Deep Cycle vs. Dual-Purpose Batteries for Trolling Motors: Which Is Better?

By KWS Adams Nov27,2023
Trolling Motors

When it comes to boating and fishing, a trolling motor is an indispensable tool. Whether you’re navigating a tranquil lake or trying to stay in position while casting your line, a trolling motor provides the control and precision you need. But what powers these essential devices? Batteries. Selecting the right battery for your trolling motor is a decision that can greatly impact your boating and fishing experience. Two common options are deep cycle and dual-purpose batteries. In this article, we’ll explore the advantages and disadvantages of each type and help you make an informed choice.

Understanding Trolling Motor Batteries

Before we dive into the comparison, it’s crucial to understand the different types of batteries used for trolling motors.

Deep Cycle Batteries

Deep cycle batteries are designed to provide a steady, consistent power output over an extended period. They are specifically built to withstand deep discharges without significant damage. These batteries are often used in applications that require sustained power, such as electric trolling motors.

Dual-Purpose Batteries

Dual-purpose batteries, as the name suggests, are designed to serve multiple functions. They are a hybrid between starting batteries (used to crank the engine) and deep cycle batteries. Dual-purpose batteries are versatile and can be used to both start the engine and power accessories like trolling motors.

Key Factors to Consider When Choosing a Trolling Motor Battery

Choosing the right battery for your trolling motor involves considering several critical factors:

  • Capacity and Run-time

The capacity of a battery determines how long it can power your trolling motor. A higher capacity battery will typically provide a longer run-time, allowing you to spend more time on the water. Deep cycle batteries often have higher capacities, making them suitable for longer trips.

  • Durability and Lifespan

The durability and lifespan of a battery are essential considerations. You want a battery that can withstand the rigors of boating and fishing without needing frequent replacements. Deep cycle batteries are built to last through many discharge cycles, making them a durable choice.

  • Maintenance Requirements

Some batteries require more maintenance than others. Understanding the maintenance needs of your chosen battery is crucial to ensure its longevity and reliable performance. Deep cycle batteries may require more maintenance compared to dual-purpose batteries, but this depends on the specific type and brand.

  • Cost Considerations

Your budget is a significant factor in your battery selection. Deep cycle batteries often come with a higher upfront cost, but they may provide better value in the long run due to their longer lifespan and deeper discharge capabilities. Dual-purpose batteries are generally more budget-friendly initially. To learn more about this topic, click here.

Deep Cycle Batteries: Pros and Cons

Now that we have a good understanding of deep cycle batteries let’s delve into their advantages and disadvantages.

Deep Cycle Batteries

Advantages of Deep Cycle Batteries

  • Longer Run-time: Deep cycle batteries are designed to provide sustained power over an extended period. If you enjoy longer fishing trips, a deep cycle battery can keep your trolling motor running for hours.
  • Deep Discharge Capability: Deep cycle batteries can handle deeper discharges without suffering significant damage. This means you can drain the battery further without worrying about harming it, ensuring you get the most out of your charge.
  • Ideal for Electric Trolling Motors: Electric trolling motors benefit from the steady, consistent power output of deep cycle batteries. If you have an electric trolling motor, a deep cycle battery is a great match.

Limitations of Deep Cycle Batteries

  • Heavier and Bulkier: Deep cycle batteries tend to be heavier and bulkier compared to other types, making them less convenient to handle and transport.
  • May Require More Maintenance: While deep cycle batteries are known for their durability, they may require more maintenance to ensure optimal performance and longevity. This can be a downside for users looking for a low-maintenance solution.
  • Higher Upfront Cost: The initial cost of deep cycle batteries is often higher than other battery types. However, the extended lifespan and performance can offset this cost over time.

Dual-Purpose Batteries: Pros and Cons

Now, let’s explore the advantages and disadvantages of dual-purpose batteries.

Advantages of Dual-Purpose Batteries

  • Versatility for Other Applications: Dual-purpose batteries can serve multiple functions, making them ideal for those who want a battery that can also start their boat’s engine. This versatility can be a significant advantage for boat owners with limited space or those who want a simpler setup.
  • Smaller and Lighter: Dual-purpose batteries are generally smaller and lighter, making them easier to handle and install in your boat.
  • Lower Initial Cost: Dual-purpose batteries are typically more budget-friendly upfront, which can be appealing to boaters looking to save on initial expenses.

Limitations of Dual-Purpose Batteries

  • Shorter Run-time: Dual-purpose batteries may not provide as long a run-time as deep cycle batteries. This can be a limitation for those who require extended use of their trolling motor.
  • Limited Deep Discharge Capability: Unlike deep cycle batteries, dual-purpose batteries may not handle deep discharges as effectively. Over time, this can affect their overall lifespan and performance.
  • Potentially Shorter Overall Lifespan: The dual-purpose nature of these batteries can result in a shorter overall lifespan when compared to dedicated deep cycle batteries.

Choosing the Right Battery for Your Needs

Selecting the right battery for your trolling motor largely depends on your specific requirements, boating style, and preferences. Here’s how to make an informed decision:

Assess Your Specific Requirements and Boating/Fishing Style

Consider the following:

  • How often and how long you plan to use your trolling motor.
  • Whether you need a battery for other functions like engine starting.
  • The size and weight restrictions of your boat.
  • Your budget for the battery purchase.

Consideration of the Type of Trolling Motor You Have

Different trolling motors have varying power requirements. Electric trolling motors, for instance, benefit from deep cycle batteries due to their steady power output. If you have a gas-powered trolling motor, a dual-purpose battery might be a more suitable choice, as it can also start your engine.

Weigh the Pros and Cons of Deep Cycle and Dual-Purpose Batteries

Dual-Purpose Batteries

Refer back to the advantages and limitations of both battery types, and weigh them against your specific needs and preferences.

Evaluate Budget Constraints

Your budget plays a significant role in your battery choice. Determine how much you’re willing to invest in a battery, keeping in mind that while deep cycle batteries have a higher initial cost, they may provide better long-term value.

Seek Expert Recommendations and Case Studies

Consult with experts in the boating and fishing community or read online reviews and case studies to learn from the experiences of other users. Real-world feedback can provide valuable insights and help you make an informed decision.

Maintenance and Care

No matter which battery type you choose, proper maintenance is key to ensuring its longevity and optimal performance. Here are some general maintenance tips:

  • Keep the battery terminals clean and free of corrosion.
  • Store the battery in a cool, dry place when not in use.
  • Regularly check the water levels in flooded lead-acid batteries and top them up if necessary.
  • Charge your battery after each use and avoid over-discharging it.

For deep cycle batteries, consider these additional maintenance practices:

  • Perform occasional capacity tests to ensure the battery is still holding its charge effectively.
  • Equalize the battery periodically to prevent sulfation and stratification.


In the deep cycle vs. dual-purpose battery debate, there is no one-size-fits-all answer. The right choice depends on your specific needs, your trolling motor type, and your budget. Both deep cycle and dual-purpose batteries have their advantages and limitations, and understanding these factors is crucial to making an informed decision.

When selecting a battery for your trolling motor, consider your run-time requirements, maintenance preferences, and budget constraints. If you’re looking for longer run-times and don’t mind the initial investment, a deep cycle battery may be the way to go. On the other hand, if you seek versatility and a budget-friendly solution, a dual-purpose battery could be a better fit.

Ultimately, the ideal battery for your trolling motor is the one that enhances your boating and fishing experience, ensuring you can enjoy the water without worrying about your power source. By carefully evaluating your needs and weighing the pros and cons, you can confidently select the battery that best suits your individual requirements.

By KWS Adams

My name is KWS Adams . (Call me Kateregga). I am an IT addict who loves playing around with computers and internet. Computers help me try out different things while turning them into reality, while the internet powers me stay live online. Besides computers, I am a project planning and management professional with an Award obtained from MUK, one of the oldest and best Universities in Africa. Find me on Twitter, Facebook and Whatsapp. Find more on how to contact me using the contact me page.

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