The Importance of Choosing the Right Trolling Motor Battery for Anglers

For those curious about aquatic adventures, it’s necessary to count on mighty trolling motor batteries. That’s where the 12 volt trolling motor battery offers a dependable and meticulous performance on the water. 

In our guide today, we desire to examine the distinct classes of trolling motor batteries and concentrate on their elementary characteristics. Also, we’ll study maintenance tips and compare 12 volt trolling motor batteries with other voltage variations. 

Trolling motor battery - manly

Types of Trolling Motor Batteries

Trolling motor batteries come in diverse designs and shapes. Among them, 12 volt trolling motor battery shines as it revolutionizes your aquatic adventures. Below, we’re going to learn more about the types of trolling motor batteries and their characteristics.

  1. Lead-Acid Batteries: These trolling motor batteries are known as a strong and reliable option. They’re gallant workhorses that have empowered trolling motors since a long time ago with their affordability and prevailing essence. Anglers who need a cost-effective and undying option can take advantage of lead-acid batteries to verify that traditional power can still beat the waves. 
  2. AGM (Absorbent Glass Mat) Batteries: AGM batteries are believed to be a stable and low-maintenance variation of lead-acid trolling motor batteries. They come with impenetrable designs that repel spills and furnish an uncluttered and effortless adventure. These batteries are a terrific selection for those who appreciate efficiency without the time-consuming patterns of recurring maintenance, which makes them last for water outings.
  3. Lithium-ion Batteries: Lithium batteries have successfully redefined the power competition for avid trolling motor buffs. These batteries are packed and light, and supply unparalleled energy density and high performance. Although lithium-ion batteries are a little pricier, they survive longer and deliver speedier charging times, which are tempting options for those looking for top-notch batteries with meticulous and potent performance. 

The Best 12 Volt Trolling Motor Batteries

Among all different trolling motor batteries, the 12 volt trolling motor battery is known as the heartbeat of aquatic power. It attracts anglers through the waters, offering precise performance and reliability.  

Below, we’re going to discuss critical features of 12 volt trolling motor batteries along with their prices and their performance in different conditions. 

1. Key Features of 12 Volt Trolling Motor Batteries

Before purchasing a 12 volt trolling motor battery, it’s critical to learn about its key features and characteristics. 

  1. Battery Type: It’s needless to say that the type of the 12 volt trolling motor battery is the first integral decision. You can select from lead-acid, AGM, and lithium-ion batteries. Lead-acid batteries are affordable, and AGM batteries are durable and maintenance-free, but lithium batteries offer a cutting-edge and compact design that’s best for high-performance purposes.
  2. Battery Capacity: The capacity of a 12 volt trolling motor battery distinguishes its perseverance on the water. Batteries with higher capacity offer lengthened run time, which is an intensely critical factor for most anglers. Evaluate your usage habits and decide on a battery with pleasing capacity.
  3. Voltage Requirements: The battery voltage must be agreeing with your trolling motor’s voltage needs. Make sure your desired battery fits the motor’s characteristics so you’ll appreciate a unique and efficient power conversion. This synergy between battery and motor voltage is integral for optimized performance.
  4. Durability: Steadiness in severe aquatic circumstances is a critical attribute of the best 12 volt trolling motor batteries. Whatever the water condition is, a long-lasting battery can supply a dependable power source that withstands the severity of marine areas.
  5. Weight: The weight of the battery influences the serenity and maneuverability of your watercraft. Lead-acid batteries are a heavier choice, but lithium-ion batteries are more weightless. Assess your boat size and weight capacity to harmonize power and maneuverability. 
  6. Reserve Capacity: The reserve capacity describes a battery’s power to conserve a usable voltage under a load. This is a crucial element for anglers in altering water conditions or when they encounter unforeseen challenges. A higher reserve capacity aids you in reserving the power for emergencies.

2. Performance in Different Conditions

Anglers who have to use trolling motors in chilly waters require a battery that can survive cold temperatures. 12 volt trolling motor batteries deliver muscular performance in cold weather conditions as they uphold their high performance even when the mercury plunges. 

What’s more, resistance against heat is equally vital, especially in warmer climates. AGM batteries present a more potent performance in such weather conditions. The critical point is to assess your area’s weather conditions when making your conclusive choice.

3. Price vs. Value

Trolling motor batteries are offered with varying price tags that mirror their various technologies and attributes. Lead-acid batteries are usually less expensive. AGM models fall in the middle price interval. Also, lithium batteries are costlier, but they provide modern technologies and long-term value.

It’s paramount to weigh cost against performance when picking the right battery. Budget constraints might impact your decision largely, but it’s integral to assess the long-term value and performance usefulness of the pricier option. 12 volt trolling motor batteries can undoubtedly revamp your fishing adventures if they exactly match your distinct needs. 

Trolling motor battery - manly

Choosing the Right Battery Power for Your Boat

Selecting the perfect battery for your boat starts with understanding your boat’s power needs. You need a battery that not only meets but ideally exceeds your boat’s minimum power requirements. This ensures your boat’s appliances run efficiently for the desired duration.

1. Calculating Your Boat’s Power Needs

Step-by-Step Guide to Estimate Power Requirements:

  1. List Your Boat’s Electrical Equipment: Begin by listing all electrical devices on your boat, including lights, bilge pumps, trolling motors, and other gadgets.
  2. Determine Each Gadget’s Power Use: Note down the power consumption (in amps) of each device. This information is usually in the boat’s manual. If unavailable, a multimeter can measure it.
  3. Estimate Running Time: Consider how long you’ll use each device in a single charging cycle. For instance, if you use a light for 6 hours daily and charge daily, its running time is 6 hours.
  4. Calculate Amp Hour Rating: Multiply each device’s amperage by its running time. For example, a light using 1 amp for 6 hours requires 1 Ah.
  5. Total Power Draw: Add up the Amp-hour ratings of all devices to find your boat’s total power usage.
  6. Factor in Losses and Extra Needs: Add a safety margin of 20-30% to account for system losses and occasional extra power needs.
  7. Determine Required Battery Rating: The total Amp-hour value you calculate is the battery rating you should look for. Batteries are usually marked with their Amp-hours, simplifying your choice.

2. Alternative Method: Wattage Calculation

Calculating Based on Wattage:

  1. Total Wattage Calculation: Add up the wattages of all your boat’s devices. For instance, add the wattage of lights, navigation systems, autopilot, radar, and other devices.
  2. Convert to Watt-hours: Multiply the total wattage by the number of hours you plan to use them on a single charge.
  3. Convert to Amp-hours: Divide the total Watt-hours by your boat’s voltage system (e.g., 12V) to get the Amp-hour rating.Example: If your total wattage is 150 Watts and you use it for 6 hours, it’s 900 Wh. For a 12V system, this equals 75 Ah.

Here is a table serves as a guide to match the weight of a boat with the minimum recommended thrust level and the appropriate battery size needed to power the motor.

Weight of Boat Recommended Thrust Level (Minimum) Battery Size Needed
<1500 30 lbs 12V battery
2000 40-45 lbs 12V battery
2500 50-55 lbs 12V battery
3000 – 3500 70 lbs 24V battery
4000 80 lbs 24V battery
>=4500 101-112 lbs 36V battery

Caring Tips for 12 Volt Trolling Motor Batteries

Although the right 12 volt trolling motor battery helps anglers enjoy pleasurable aquatic adventures, proper supervision/care is necessary to keep the journey secure. Let’s learn more about the best approaches to making sure your battery stays a trustworthy powerhouse. 

1. Charging Best Practices

Specifying a systematic charging timetable leads to a longer lifespan of your battery. Always avoid full discharges and instead, arrange for frequent, medium charging cycles. This technique maximizes the lifespan of the battery and results in ongoing high performance.

Plus, note that overcharging leads to consequential menaces to battery health. To manage this, pick quality chargers with intelligent technologies that automatically modify the charging process. Such chargers stop overcharging and shield the battery against extreme stress and probable deterioration.

2. Storage Guidelines

When your trolling motor isn’t in use during the off-season, it’s intensely crucial to keep it correctly. The best strategy is to charge the battery to about 50% because keeping it fully charged/depleted can result in degradation. To conserve its condition, keep the battery in a cool and dry spot. 

It’s customary for batteries to discharge over time, even when you don’t use them. Try to use a battery maintainer or trickle charger during storage to counterbalance self-discharge. This procedure keeps your battery charged until you arrange to go fishing again. 

3. Troubleshooting Common Issues

If you witness a deduction in battery capacity, inspect for possible reasons. It can be due to distinct elements such as age, overcharging, or prolonged discharges. Remember to routinely watch for such problems to retain the most pleasing performance of the battery. 

Besides, if your battery can’t charge adequately, meticulously examine the charging system, connections, and charger functionality. Cleanse terminals and make sure the connection is secure. Periodic troubleshooting hinders likely disruptions during the happenings on the water.

Comparison with Other Voltage Options

Now that you understand the basics of 12 volt trolling motor batteries, you might wonder what other voltage options are available for your purposes. 

Although 24 volt and 36 volt trolling motor batteries are available on the market, they’re considered a better option for larger vessels or those that demand extra thrust. These options with more elevated voltage are mostly used in bass boats and larger watercraft as they furnish augmented power for more demanding applications. However, their power might be too high for smaller boats or casual anglers.

On the other hand, 12 volt trolling motor batteries come with multiple advantages, including: 

  • Versatility: The 12 volt trolling motor batteries present power and versatility simultaneously. These batteries are most satisfactory for a comprehensive spectrum of boat sizes and types, supplying outstanding thrust for most recreational and fishing activities. This makes them a favored selection among anglers who don’t necessarily need excessive power.
  • Ease of Setup: The configuration and installation procedure of 12 volt trolling motor batteries are uncomplicated. Their system comprises fewer components to manage, hence delivering a simple grid of wiring and configuration. This comfortable arrangement mostly satisfies those looking for trouble-free adventures on the water.
  • Accessibility and Affordability: 12 volt trolling motor batteries are ubiquitous. This makes it straightforward to replace or upgrade these batteries. Also, they’re less expensive than higher-voltage options, hence being an ideal choice for anglers looking for the finest performance and affordability in one product. 

Understanding Battery Size Requirements for Trolling Motors

1. Importance of Proper Battery Size for Boats

Selecting the correct battery size for your boat is essential to ensure its best performance and to maintain safety. The battery size can significantly affect various aspects of your boat’s operation.

Impact on Boat’s Electrical System and Engine

Proper Power Supply: A battery that correctly fits your boat’s needs ensures the electrical system runs smoothly. This leads to efficient engine performance and minimizes gas usage. A battery that’s too big or too small can cause problems.

  • Too Big: An oversized battery may make your boat’s electrical system work harder than it should. This can lead to damage and less efficient operation.
  • Too Small: If the battery is too small, it might not have enough power for your boat’s needs. This can cause the engine to work harder, increasing fuel consumption and potentially leading to power failures.

Risks of Incorrect Battery Size

Using a battery that is not the right size for your boat can lead to several problems:

  • Strained Engine: The alternator works extra hard to power an unsuitable battery, leading to increased fuel consumption and reduced boat performance.
  • Electrical System Stress: Both oversized and undersized batteries put stress on the boat’s electrical system. This can cause appliances to fail and might even damage the battery itself.
  • Safety Hazards: Incorrect battery size can lead to fluid spills, sparks, overheating, and in extreme cases, fire hazards.

Consulting Experts for the Right Choice

To ensure you choose the best battery for your boat, it’s wise to consult with experts or refer to your boat manufacturer’s recommendations. Consider these factors:

  • Power Requirements: Think about the power needs of your boat’s electrical systems.
  • Run Time: Consider how long you need the battery to last during your boating activities.
  • Weight Distribution: Ensure that the battery size aligns with your boat’s weight distribution for optimal stability.
  • Budget: Find a balance between cost and the quality you need.

2. Selecting the Right Battery Size for Trolling Motors

When it comes to powering your boat’s trolling motor, picking the correct battery size is vital. This choice depends on several factors, each playing a key role in ensuring your boat operates smoothly and effectively.

Boat Size and Weight

Bigger Boats, Bigger Batteries: The size and weight of your boat are the first things to think about. If you have a large boat, it’s going to need a battery with a high amp-hour (Ah) rating. This is because big boats need more power to keep the trolling motor running for a long time.

Trolling Motor Power Needs

Thrust and Battery Demand: The power your trolling motor needs, known as thrust, directly affects the size of the battery you should choose. Motors with higher thrust require more power. To meet this need, you’ll need a bigger battery that can deliver enough power without running out too quickly.

Fishing Conditions

Adapting to the Environment: Another important aspect is the conditions you’ll be fishing in. If you’re dealing with strong winds or currents, your trolling motor will need more power to fight against these forces. This means you’ll likely need a larger battery to ensure your motor has enough power to handle these challenging conditions.

3. Understanding Battery Size for Trolling Motors

Choosing the right battery size for your trolling motor is crucial and depends on various factors, including your boat’s size, the weight it carries, and the motor’s power needs.

Small Boats and Light Loads

Compact Choice – Group 24 Batteries: For smaller boats carrying lighter loads and equipped with less powerful motors, a group 24 battery often does the job well. These batteries usually measure about 10 x 6.88 x 9.94 inches and typically offer a capacity between 70-85 Ah. An example is the LiTime group 24 LiFePO4 battery, which provides a higher capacity of 100Ah, making it a more robust option.

Bigger Boats and Heavier Loads

Bigger Boats, Bigger Batteries: For larger vessels that carry more weight and have more demanding motors, group 27 or 31 batteries are generally recommended.

  • Group 27 Batteries for Enhanced Power: Group 27 batteries are larger, measuring around 12 x 6.75 x 8.88 inches, with a capacity ranging from 90-105 Ah. These batteries are suited for boats that require more power and have greater electrical demands.
  • Max Power with Group 31 Batteries: For even larger boats, group 31 batteries are a suitable choice. They measure approximately 13 x 6.81 x 9.44 inches and offer a capacity between 100-125 Ah. These batteries are designed to cater to the highest power requirements in larger marine vehicles.

Trolling Motor Battery Maintenance: Maximizing Lifespan

Ensuring the longevity and reliability of your trolling motor batteries requires attention to detail and regular maintenance. Here’s a straightforward guide to help you get the most out of your batteries, whether they’re lithium trolling motor batteries or other types.

1. Key Steps for Trolling Motor Battery Maintenance

  1. Prompt Recharging: Charge your batteries immediately after use. Avoid letting them sit below 12.4 volts to prevent lead sulfate formation that diminishes performance and lifespan.
  2. Trickle Charging: During the offseason, maintain battery power with a trickle charger or monthly recharging. Prolonged uncharged states harm the battery’s performance and life.
  3. Complete Charge Cycles: Fully drain and recharge your battery regularly. Avoiding partial cycles prevents chemical imbalances known as stratification, which can reduce efficiency.
  4. Cooling Period Post-Charging: Let your battery cool after recharging. Using a battery while hot can cause damage.
  5. Battery Equalization: Regularly equalize the charge in your battery. Most chargers have a setting for this, which ensures cell balance.
  6. Water Level Checks for Wet Cell Batteries: Monthly checks and distilled water top-offs are necessary for maintaining lead-acid wet cell batteries.
  7. Proper Storage: Store your battery in a dry, moderate environment. Extreme temperatures are harmful.
  8. Regular Battery Inspections: When taking your battery out of storage, check for any signs of damage like bulging or cracks.
  9. Quality Chargers: Invest in a high-quality charger. Cheaper models may not fully charge your battery.

2. Additional Trolling Motor Battery Tips

  1. Understanding Boat Power Requirements: Familiarize yourself with your boat’s power needs. Matching your battery’s discharge rate with the motor’s consumption enhances efficiency.
  2. Optimal Usage Conditions: Use your trolling motor in calm waters to reduce battery strain.
  3. Monitoring Battery Age: Keep track of your battery’s age. Over time, batteries lose capacity and efficiency.
  4. Careful Transportation: Handle lead-acid wet cell batteries with care to avoid damaging internal components.
  5. Routine Battery Checks: Use tools like a hydrometer and voltmeter for routine checks on lead-acid batteries.

How Manly Battery Elevates Trolling Motor Power

MANLY Battery is a distinguished Chinese manufacturer with over a decade of dominance in constructing 12 volt trolling motor batteries. The company delivers modern manufacturing plants to supply both quantity and quality at the most elevated levels. MANLY Battery is specialized in LiFePO4/lithium-ion batteries varying from 6V to 72V. 

What’s distinctive about MANLY Battery is its adherence to customization as it empowers users to customize their battery voltage, capacity, and more to meet distinct 12 volt trolling motor needs. Supported by its mighty warranty, protection features, and an outstanding 95% energy efficiency rate, MANLY Battery is today a dedicated reference for cost-effective, high-quality 12 volt trolling motor batteries. 

Select The Right LiFePO4 Battery for Your Trolling Motor

Propulsion Force Range Lithium Iron Phosphate (LiFePO4) Battery Capacity Range Suggested Battery Unit
30 to 55 pounds 50-100 Ah MANLY 12v 50Ah
MANLY 12v 100Ah
55 to 80 pounds 100-150 Ah MANLY 12v 200Ah
80 to 100 pounds 150-200 Ah MANLY 12v 300Ah
200 to 300 pounds 200-300 Ah Contact Our Sales

We Can Customized for You


What Size Battery for Trolling Motor?

The suitable battery size for a trolling motor depends on several factors including the boat size and weight, the trolling motor’s thrust, and the specific fishing conditions. Generally, the most common battery group sizes for trolling motors are 24, 27, and 31.

  • For smaller boats with lighter loads and less powerful motors, a group 24 battery may be adequate. These typically measure around 10 x 6.88 x 9.94 inches with a capacity of about 70-85 Ah. However, some advanced models like the LiTime group 24 LiFePO4 battery offer a capacity of 100Ah, providing more power in a compact size.
  • For larger boats carrying heavier loads and equipped with more powerful motors, group 27 or 31 batteries are more appropriate. Group 27 batteries usually have dimensions of approximately 12 x 6.75 x 8.88 inches with a capacity range of 90-105 Ah. Group 31 batteries are larger, measuring around 13 x 6.81 x 9.44 inches, with a capacity of 100-125 Ah.

The choice between larger and smaller batteries involves a trade-off: larger batteries offer more power and longer run times but are heavier and bulkier, which can impact the boat’s performance and maneuverability. Smaller batteries are easier to handle and lighter but may not provide sufficient power for extended use. It’s crucial to find a balance between size and performance, considering factors like boat weight, motor thrust, and fishing conditions. Upgrading to a LiFePO4 battery can be a beneficial solution, as these batteries offer high energy density and lighter weight, enhancing overall efficiency and performance.

Are Lithium Trolling Motor Batteries Worth It?

Lithium trolling motor batteries offer several compelling advantages that make them a worthy investment for many users, particularly in competitive and heavy-use scenarios like bass fishing tournaments.

  1. Speed and Efficiency: Lithium batteries are significantly lighter than lead-acid batteries, often weighing up to 70% less. This substantial weight reduction can enhance the speed and agility of the boat, allowing it to reach fishing spots quicker and navigate shallower waters more easily.
  2. Extended Operating Time: Lithium batteries offer 25-50% higher capacity compared to lead-acid batteries. This translates into longer usage times, enabling anglers to fish from dawn to dusk on a single charge. Moreover, lithium batteries can be charged quickly, often within 2 hours, and can be used partially charged without affecting performance or longevity.
  3. Consistent Power Delivery: Unlike conventional marine batteries that lose effectiveness at about 50% capacity, lithium batteries provide consistent voltage throughout their discharge cycle. This ensures full thrust and efficient operation of the trolling motor for the entire duration of the battery life.
  4. Cost-Effectiveness and Longevity: While the initial investment in lithium batteries is higher than for lead-acid batteries, they offer significant long-term savings. Lithium batteries have a much longer lifespan, averaging around 10 years, and retain high capacity even after numerous charging cycles. Additionally, the reduced weight leads to fuel savings, as the boat requires less throttle and can plane more easily.
  5. Overall Performance Enhancement: Switching to a lithium battery is akin to upgrading the entire boating experience. It not only improves the boat’s performance in terms of speed and agility but also enhances reliability and reduces operational costs over time.

Can I Use a Lithium Battery for My Trolling Motor?

Yes, you can use a lithium battery for your trolling motor. Lithium batteries, especially Lithium Iron Phosphate (LiFePO4) types, are increasingly popular for use with trolling motors due to several advantages they offer over traditional lead-acid batteries.

  1. Weight Advantage: Lithium batteries are much lighter than lead-acid batteries, making them ideal for use in boats where weight can impact speed and efficiency.
  2. Longer Lifespan: Lithium batteries generally have a longer lifespan, often lasting several times longer than standard lead-acid batteries. This makes them a cost-effective option in the long run.
  3. Consistent Power Output: Lithium batteries maintain a consistent voltage level for most of their discharge cycle, ensuring that the trolling motor operates efficiently throughout use.
  4. Faster Charging Times: Lithium batteries can be recharged much faster than lead-acid batteries, reducing downtime and making them more convenient for frequent use.
  5. Safety and Maintenance: Lithium batteries are typically safer and require less maintenance compared to lead-acid batteries. They are less prone to leaking and do not emit gases during charging.

It is important, however, to ensure that the lithium battery is compatible with your trolling motor in terms of voltage and capacity. Additionally, your charging system should be suitable for lithium batteries, as they require a different charging profile compared to lead-acid batteries. Always consult the trolling motor and battery manufacturer’s guidelines to ensure compatibility and optimal performance.

How To Charge Trolling Motor Battery?

Charging a trolling motor battery is a straightforward process, but it requires careful attention to ensure safety and extend the life of the battery. Here are the steps:

  1. Safety First: Before charging, unplug your motor and inspect the battery. Check for any leaks, damage, or corrosion. Ensure the battery terminals are clean to facilitate a good connection.
  2. Connecting the Charger: Attach the charger to the battery, connecting the positive (red) terminal first, followed by the negative (black) terminal. If you’re charging multiple batteries in a bank, repeat this process for each battery.
  3. Power Connection: Once your charger is correctly attached to the battery, connect it to a power source. After the connection is secure, turn on the charger.
  4. Monitoring the Charge: Keep an eye on the charging process. Some chargers will display the remaining charge time, while others might not. It’s important to monitor the battery for signs of overcharging or overheating. Although modern chargers often have built-in safeguards against these issues, it’s advisable not to leave the battery charging unattended for extended periods.
  5. Completing the Charge: Once the battery is fully charged, turn off the charger before disconnecting it from the power source. Then, disconnect the charger from the battery, doing so in reverse order – first disconnect the black (negative) terminal, followed by the red (positive) terminal.

How Long Do Trolling Motor Batteries Last?

The lifespan of trolling motor batteries varies depending on the type and how they are used. There are mainly three types of batteries used for trolling motors: Lead Acid Wet Cell, AGM (Absorbed Glass Mat), and Lithium batteries.

  1. Lead Acid Wet Cell Batteries: These are the most common and affordable option for trolling motors. They typically last around 2-3 years but may require maintenance. The cells in these batteries are submerged in a mixture of sulfuric acid and water, and they can be prone to water loss when overcharged, requiring periodic topping up with distilled water.
  2. AGM Batteries: AGM batteries are sealed and do not require the maintenance that wet cell batteries do. They generally have a slightly longer lifespan, lasting about 3-4 years. AGM batteries are more expensive than lead-acid wet cells but offer the convenience of being maintenance-free.
  3. Lithium Batteries: Lithium trolling motor batteries are superior in terms of lifespan and performance. They can last up to 10 times longer than lead-acid batteries, often providing 80% rated capacity over 2,000 cycles. Lithium batteries offer fast charging times, consistent power delivery, are temperature resistant, lightweight, and require no maintenance.

The actual duration a battery will last on a single charge is also influenced by its amp-hour rating. A higher amp-hour rating means the battery can supply power to the trolling motor for a longer period. It’s recommended to have at least 100 amp hours for trolling motors to ensure reliability, but higher ratings like 125 amp hours will last even longer.