Importance Of Trolling Motor Battery

Trolling motors are electric motors specifically designed for fishing and small boating activities. They provide smooth and quiet power to boats, helping to increase the success rate of fishing, making them ideal for environments where a silent approach to schools of fish is necessary.

The performance and efficiency of an electric motor, and consequently the operational efficiency of the boat, are directly impacted by the batteries used. Therefore, choosing the right battery for your trolling motor is crucial.

4 Types Of Trolling Motor Battery

Trolling motor batteries can generally be categorized into the following four types:

Flooded Lead-Acid Battery(FLA)

Flooded lead-acid batteries are the most traditional type of lead-acid batteries. They use dilute sulfuric acid as the electrolyte.

Pros And Cons

Compared to other types of batteries, FLA (Flooded Lead Acid) batteries have the most mature technology and are the least costly, making them very suitable for users with limited budgets. However, their disadvantages are also quite clear, such as being heavier, which makes them unsuitable for use in lightweight devices.

Flooded lead-acid batteries require high maintenance. You need to regularly check the internal electrolyte and timely replenish it with distilled water; it’s also necessary to regularly clean the terminals to prevent corrosion. It’s particularly important to be aware of the risk of leaks.

Additionally, their lifespan is relatively short, necessitating more frequent replacements. Also, you need to be more patient while waiting for them to fully charge.

GEL Battery

Gel batteries are valve-regulated lead-acid batteries that use a gel-like electrolyte. This sealed design reduces the risk of electrolyte leakage and also decreases the frequency of maintenance.

Pros And Cons

Gel batteries do not cause environmental pollution due to liquid leaks and do not require periodic watering for maintenance. They not only withstand deep discharges but also recover quickly. Additionally, the gel state of the electrolyte makes them more stable, safer, and better suited to harsh operating environments.

Compared to FLA batteries, gel batteries are more expensive and more sensitive to temperature, which also demands more precise charging methods.

AGM (Absorbed Glass-Mat) Battery

Both AGM and Gel batteries are types of sealed lead-acid batteries. However, in AGM batteries, the electrolyte is absorbed and immobilized within glass fiber separators.

Pros And Cons

AGM batteries have a very low risk of liquid leakage and can be placed in any orientation, requiring minimal maintenance. Their structure is very stable, allowing them to operate across a wide temperature range. Although they can be charged and discharged rapidly, it is best to avoid overcharging, as this can shorten their lifespan. Additionally, AGM batteries are not lightweight and cost more than traditional lead-acid batteries, but they do benefit from a relatively low self-discharge rate.

Lithium Ion / Lifepo4 Battery

Batteries that use lithium-ion or lithium iron phosphate technology are popular in electric tools because of their high energy, lightweight, and long lifespan.

Pros And Cons

Lithium batteries/lithium iron phosphate batteries can provide high energy with a smaller size and weight, effectively reducing the burden on trolling boats. Lithium batteries have a very low self-discharge rate and can undergo thousands of charge-discharge cycles, quickly balancing your initial investment. Additionally, lithium batteries charge quickly but have a long runtime, supporting your trolling activities for extended periods.

Although lithium batteries do not contain harmful substances such as heavy metals, their recycling and disposal require special handling to prevent pollution.

Factors To Consider When Choosing A Battery

Battery Types

Different types of batteries have different characteristics and costs. Therefore, we need to clarify several requirements, such as cost, weight, maintenance needs, battery life, and charging time.

Battery Capacity (Ah)

The capacity of a battery determines how much electrical energy it can store. This electrical energy affects the battery’s runtime. Therefore, we need to choose the appropriate battery capacity based on the motor’s power and the expected duration of use.

Voltage Requirements

The voltage of the battery should match the voltage requirements of the trolling motor, with common options being 12V, 24V, and 36V.

Weight And Size

The weight and size of the battery can affect the load capacity and balance of the boat. For small boats or applications that require frequent movement, choosing a lightweight battery is more appropriate.

Durability And Maintenance

Theoretically, among these four types of batteries, lithium batteries have the longest lifespan and a wider operating temperature range. In terms of maintenance costs, flooded lead-acid batteries require regular replenishment of electrolyte and cleaning of terminals, whereas the other three types of batteries require little to no maintenance.

Charging Speed

If you use your trolling motor frequently, then you need to consider the charging speed. Lithium batteries can be charged in a relatively short amount of time, making them suitable for situations that require frequent use and charging. Lead-acid batteries, on the other hand, require more patience due to their slower charging speed.


Budget considerations come first. Although lead-acid batteries are low in cost, they have a higher self-discharge rate and a shorter lifespan. Lithium batteries, while more expensive initially, have a lower self-discharge rate and a longer service life, making them more cost-effective in the long run.

Environmental Impact

If you are environmentally conscious, green lithium batteries are more in line with your principles. This is because lead-acid batteries contain heavy metals and their internal electrolyte poses a risk of leakage, which can easily impact the environment.

Review Of Best Batteries For Trolling Motors

Next, let’s look at some well-known battery brands and models to see what highlights they offer.

Top Lead-Acid Battery Picks

Optima BlueTop D27M

This AGM battery is known for its durability and long-lasting power supply, making it suitable for extended trolling activities.

Interstate Deep Cycle Marine Battery

This is a wet-cell lead-acid battery, favored by many trolling enthusiasts for its robust construction and excellent deep-cycle capabilities.

Trojan T-105

This 6-volt battery typically requires two to be connected in series to provide a 12-volt output, suitable for situations that require high capacity and extended usage.

Top Lithium Battery Picks

Dakota Lithium 12V 100Ah

This battery is renowned for its exceptionally long lifespan and high efficiency, making it suitable for trolling motors that require prolonged use and high output.

Battle Born LiFePO4 Deep Cycle Battery

This battery utilizes lithium iron phosphate chemistry, offering high performance and a long lifespan, making it suitable for use in demanding trolling environments.

Delong Lithium-Iron Phosphate Battery 12V 100Ah

This battery also uses lithium iron phosphate technology, providing safety, stability, and a long lifespan. It is not only suitable for extended outdoor use but also reasonably priced.


From the above, you can see that there are many nuances to choosing the right battery. The appropriate battery plays a crucial role in our water activities, whether for leisure or for professional fishing competitions. Investing in a high-quality and potential-rich battery can enhance your experience.

If you are in the process of selecting a trolling battery, please feel free to contact us. Delong is a professional manufacturer of lithium trolling batteries, equipped with a strong research and development and manufacturing team, ready to provide you with high-performance and reasonably priced lithium batteries.


How Often Should I Charge My Trolling Motor Battery? 

The correct charging method helps maintain the performance and lifespan of a battery. Different types of batteries require different charging frequencies. For lead-acid batteries, it is advisable to charge them as soon as possible after each use and avoid letting the charge drop below 50%. If you do not use them frequently, it’s best to charge lead-acid batteries at least once a month.

For lithium batteries, you can fully utilize their capacity before recharging. Of course, you can also charge them after each use. If they are not in use for an extended period, it is recommended to charge lithium batteries every 3 to 6 months.