Trolling Motor Batteries Explained: Everything You Need to Know

By Gerald, Updated on August 27, 2024

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A reliable trolling motor allows you to cover more water, reach those hard-to-get spots, and stay stealthy when targeting finicky fish. But the power behind your trolling motor is the battery – and choosing the right one can be a daunting task.

This comprehensive guide will equip you with the knowledge you need to confidently select the perfect trolling motor battery, ensuring you have the power and endurance to conquer any fishing adventure.

Part 1. Types of trolling motor batteries

The first step in choosing the right battery is understanding the different types available. Each type has its own strengths and weaknesses, impacting factors like performance, lifespan, and cost.

AGM VS Lithium VS Lead-Acid Battery: Comprehensive Comparison

Lead-Acid Batteries: These are the most traditional and often the most affordable option. They’re known for their high power output and are readily available at most auto parts stores. However, lead-acid batteries are heavy, require regular maintenance, and have a shorter lifespan compared to other options. They also release harmful fumes during charging, requiring proper ventilation.
AGM (Absorbent Glass Mat) Batteries: These batteries are a significant upgrade from traditional lead-acid batteries. They’re sealed and spill-proof, making them ideal for marine applications. AGM batteries offer better performance, are more resistant to vibration, and require less maintenance than lead-acid batteries. They also have a longer lifespan, typically lasting 3-5 years with proper care.
Lithium-Ion Batteries: These batteries are the cutting edge of trolling motor technology. They’re lightweight, incredibly powerful, and boast a significantly longer lifespan than lead-acid or AGM batteries. Lithium-ion batteries are also more environmentally friendly and don’t require regular maintenance. While they are the most expensive option, their advantages in performance, efficiency, and longevity often outweigh the initial cost.

Part 2. What size battery for the trolling motor?

Choosing the right battery size is crucial for optimal performance. Battery sizes are often categorized by group numbers, which indicate their capacity and physical dimensions.

Group 24 Batteries

Group 24 batteries are smaller and typically offer less capacity. They are suitable for light-duty use and shorter trips. If you have a small boat or don’t plan to fish for long hours, this size might be adequate.

Group 27 Batteries

Group 27 batteries offer a balance between size and power. They provide more amp-hours than Group 24, making them suitable for medium-sized boats and longer fishing trips. This is a popular choice for many anglers seeking a good balance of power and runtime.

Group 31 Batteries

Group 31 batteries are larger and provide the most capacity. They are ideal for heavy-duty use, larger boats, and extended fishing expeditions. If you plan to spend long days on the water, investing in a Group 31 battery ensures you have the power to last.

Part 3. How long does a trolling motor battery last?

The lifespan of a trolling motor battery depends on several factors, including the type of battery, its size, and how you use it. Here’s a general overview of expected lifespans for different types of batteries:

Lead-Acid Batteries: These batteries typically last for 2-3 years with proper care. However, their lifespan can be shortened by deep discharge, extreme temperatures, and improper maintenance.
AGM Batteries: These batteries have a longer lifespan, lasting 3-5 years with proper maintenance. They’re more resistant to deep discharge and extreme temperatures than lead-acid batteries, contributing to their extended lifespan.
Lithium-Ion Batteries: These batteries are known for their exceptional longevity, lasting 5-7 years or even longer. Their advanced chemistry and efficient energy management systems contribute to their extended lifespan.

Part 4. What is the best battery for a trolling motor?

Selecting the best battery involves considering your specific needs and budget.

Budget Considerations

If you’re on a tight budget, lead-acid batteries might be the most economical choice. However, they require more maintenance. AGM batteries offer a middle ground with better performance and moderate pricing. For those willing to invest more for long-term benefits, lithium-ion batteries provide unmatched performance and convenience.

Performance Needs

Consider how often and intensely you use your trolling motor. For frequent use and longer trips, a lithium-ion battery offers superior performance. If you’re an occasional angler, an AGM battery might suffice.

Part 5. Buying a trolling motor battery: key considerations

Now that you have a better understanding of battery types and sizes, let’s delve into some key considerations for choosing the right battery for your needs:

Your Trolling Motor: The size and power of your trolling motor will determine the battery pack you need. A larger, more powerful motor will require a bigger battery pack to provide sufficient power.
Your Fishing Style: Consider how you typically fish. If you plan on long trips or frequent use, you’ll need a battery with a longer lifespan and more power. If you primarily fish in calm waters for short periods, a smaller battery might suffice.
Your Budget: Lithium-ion batteries are the most expensive option, but their superior performance and longevity often make them a worthwhile investment. Lead-acid batteries are the most affordable, while AGM batteries fall somewhere in between.
Battery Capacity: The battery’s amp-hour (Ah) rating indicates how much power it can store. A higher Ah rating means longer run time. For example, a 100Ah battery can provide more power and run time than a 50Ah battery.
Battery Weight: Consider the weight of the battery, especially if you’re carrying it by hand. Lithium-ion batteries are significantly lighter than lead-acid or AGM batteries, making them easier to handle.
Battery Warranty: Look for a battery with a decent warranty to protect your investment. A good warranty provides peace of mind and ensures you’re covered in case of any defects or premature failure.

Part 6. How to charge the trolling motor battery?

Proper charging is essential for maintaining the health and lifespan of your trolling motor battery. Here’s a breakdown of the charging process:

Use the Right Charger: Always use a charger specifically designed for your battery type. Using the wrong charger can damage your battery and void its warranty.
Charge in a Well-Ventilated Area: Lead-acid batteries release hydrogen gas during charging, so it’s crucial to charge them in a well-ventilated area to prevent the buildup of flammable gases.
Follow the Charging Instructions: Consult the battery manufacturer‘s instructions for charging time and current. Overcharging or undercharging can damage your battery.
Charge Regularly: Charge your battery after each use to prevent deep discharge. Deep discharge can significantly shorten the lifespan of your battery.

Choosing the right trolling motor battery is a critical step in maximizing your fishing experience. By understanding the different types, sizes, and key considerations, you can make an informed decision that will provide the power and endurance you need to explore new waters and reel in more fish. Remember to charge your battery regularly and follow proper maintenance practices to ensure you’re always ready for a successful day on the water.

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