Choosing the Right Trolling Motor Battery

Whether you're planning a peaceful day of fishing or powering through rough waters, choosing the right battery for your trolling motor can make or break your time on the water. 

In this complete guide, we break down the different battery types: AGM, flooded, and lithium deep cycle battery, and dual purpose marine batteries. Explain key buying factors like voltage and amp hours, and offer expert tips on battery setup, maintenance, and storage. If you want reliable performance and longer battery life for your boat, this article you can read.

What is Trolling Motor Battery?

A trolling motor battery is a dedicated power source, it is typically 12 V battery for electric trolling motors used in fishing boats, kayaks, pontoons, and small watercraft. These batteries deliver steady, reliable power over extended periods and often support deep-cycle discharge, unlike traditional automotive starter batteries.

Which Battery Types Make Great Trolling Motor Batteries?

1) Lead-acid (Flooded) Deep Cycle Battery

A traditional and cost-effective option that handles repeated discharges. But a lead-acid battery requires regular maintenance, like: topping up with distilled water, ventilation, and careful storage to avoid acid corrosion. And the batteries are filled with the lead acid, so it's not very shock-resistant.

2) AGM (Absorbent Glass Mat) Trolling Motor Battery

AGM batteries are a type of sealed lead-acid battery that use fiberglass mats to absorb the electrolyte, rather than allowing it to flow freely like in traditional flooded batteries. This design makes them completely spill-proof and maintenance-free, which is a huge plus for boating or rugged use.

They’re also highly vibration-resistant, can be installed in various orientations, and generally last 3 to 5 years, a noticeable improvement over standard flooded batteries. Standard flooded battery only can last for 2-3 years.

That said, it’s important to use a voltage-regulated charger to prevent overcharging, which can shorten the battery’s lifespan. As we all known, charging AGMs correctly is key to unlocking their full potential.

If you are interested in AGM deep cycle batteries, you can learn about Uplus battery's 12v 100ah deep cycle battery, which has a lifespan of up to 8 years, 30% DOD, and can achieve 2000 deep cycles, with a variety of applications, widely used in Home Backup Power, Energy Storage, Kayak Trolling Motor, Medical Equipment, RV/VAN, Electricity Wheelchair and so on.

If you are a DIY enthusiast, you can use Uplus 12v 100ah deep cycle battery for series and parallel connection, the maximum number of parallel connection is 4 batteries, the number of series connection is unlimited.

3) Limited Battery

While lithium has its place in high-performance setups, AGM batteries often strike the better balance between price, durability, and ease of use. It makes them choice AGM type battery for most trolling motor applications.

Focus on these Parameters When Making a Purchase Decision

When choosing a trolling motor battery, there are a few key factors to keep in mind:

1) Voltage: Most trolling motors run on 12V, but some high-thrust models may require 24V or 36V setups. Make sure your battery matches your motor’s requirements.

2) Amp Hours (Ah) or Reserve Capacity (RC): These ratings indicate how long your battery can supply power. The higher the number, the longer your motor will run.

3) Vibration Resistance & Mounting Flexibility: Especially important for rough waters, a battery that can handle constant movement, and be installed in different positions, it is a major plus for durability and convenience. In practical applications, the shock resistance of AGM batteries is far superior to flooded batteries.

Trolling Motor Battery Setup: In Series vs In Parallel Connection Explained

Both deep-cycle and dual-purpose cycle batteries can be connected in series and parallel for a wide range of applications. 

Can I use a Dual Purpose Marine Battery for my Trolling Motor?

We usually see a category of batteries labeled as “dual purpose marine batteries” in our daily lives, so what are “dual purpose marine batteries”?

Dual purpose marine batteries are designed to handle both starting and deep-cycle functions. That means they can deliver a quick burst of power to start an engine and provide a steady supply of energy for accessories like trolling motors, fish finders, and lights. As a result, dual-purpose marine batteries can also be used in trolling motor.

At Uplus Battery, You have 3 dual-purpose marine batteries to choose: Group 24M, Group 27, Group 31M. You can choose the corresponding battery according to the battery parameters you need.

How to Maintain & Store Your Trolling Motor Battery for Longer Life

Proper care can significantly extend the life of your trolling motor battery. Here’s how to keep it running strong:

1. Charge After Every Use

Don’t wait for the battery to fully drain. Charge it promptly after boat trip to avoid deep discharge damage, especially for AGM and lead-acid batteries.

2. Store in a Cool, Dry Place

For off-season storage, disconnect the battery and store it in a well-ventilated, temperature-controlled area (ideally 50–70°F / 10–21°C).

3. Avoid Overcharging

Use a smart charger with automatic shut-off or float mode. Overcharging can reduce lifespan and cause internal heat buildup.

Final Thoughts

Choosing the right trolling motor battery is about more than just voltage. It’s about performance, reliability, and peace of mind on the water. For most boaters, AGM batteries offer the best mix of value and durability. Whether you’re fishing at dawn or cruising at sunset, a well-chosen battery keeps your adventure powered up.

FAQs

Q: Is a group 24m, group 27, group 31m battery better for trolling motors?

A: Dual purpose marine batteries are designed to handle both starting and deep-cycle functions. That means they can deliver a quick burst of power to start an engine and provide a steady supply of energy for accessories like trolling motors, fish finders, and lights. 

Group 24m marine battery is commonly used for smaller boat due to the compact size, group 27 marine battery is used for larger boat, group 31m battery is used for more larger boat, you can consider the size and compatibility before you buy it.

About Uplus Battery

Uplus Battery, a subsidiary of Leoch Battery, is a global brand specializing in maintenance-free AGM batteries. With 20+ years of R&D and international distribution, Uplus delivers reliable AGM solutions for cars & trucks, powersports, marine, and industrial applications.

Known for excellent start-stop performance, vibration resistance, and long service life — Uplus AGM batteries are sealed, spill-proof, and require zero maintenance.

👉 Browse Uplus AGM Batteries Here