What's the Difference: Trolling Motor vs. Outboard Motor Battery

If you're new to boating or fishing, you might be wondering about the differences between a trolling motor battery and an outboard battery. Both are essential components for powering your boat, but they serve different purposes and have distinct features.

In this article, we'll explore the key differences between these two types of batteries to help you understand their roles and make informed decisions for your boating needs.

Is Outboard Motor Battery the Same as Trolling Motor Battery?

There is no doubt that an outboard motor battery is not the same as a trolling motor battery, though many people might think they are the same.

Trolling motor batteries are designed to provide continuous power over an extended period of time. These deep cycle batteries are built to withstand regular discharging and recharging, making them ideal for powering trolling motors, fish finders, and other electronic equipment on a boat.

On the other hands, outboard motor batteries, are specifically designed to start and run boat engines. These batteries are typically cranking or starting batteries, which means they are designed to deliver quick bursts of energy to start the engine. Once the engine is running, the alternator takes over to power the electrical systems on the boat.

Key Differences Between Trolling Motor and Outboard Motor Battery

Understanding the key differences between trolling motor batteries and outboard motor batteries is essential for ensuring you choose the right battery for your boating needs. Below is a detailed comparison of their function, battery type, feature, lifespan, and more.

1.Purpose and Function

Trolling motor batteries are specifically designed to power trolling motors, which are utilized for precise, quiet maneuvers, particularly in fishing and recreational boating. These motors operate at low speeds and require a consistent, prolonged power supply.

On the other hand, outboard motor batteries are designed to start and power outboard engines, which serve as the primary propulsion system for boats. These batteries need to provide a high current in short bursts to start the engine, rather than sustaining prolonged use.

2. Battery Type

Trolling motor batteries are usually deep-cycle batteries, designed to provide a steady amount of current over an extended period. They can be discharged and recharged many times without losing capacity, making them perfect for the consistent power demands of a trolling motor. The common types of trolling motor batteries are lead-acid batteries, AGM (absorbent glass mat) batteries, and lithium-ion batteries.

In contrast, outboard motor batteries are generally starting (cranking) batteries, often of the Lead-Acid or AGM variety. These are optimized for delivering a high burst of power to start the engine and are not intended for deep discharge.

Learn More: Deep Cycle Batteries VS Starting Batteries

What Size Battery for Trolling Motor [Type & Size]

3. Key Features

Trolling Motor Battery:

• Deep Discharge Capability: Can be discharged up to 80% of their capacity without damage.
• Longer Lifespan: Designed to handle frequent deep discharges and recharges.
• Consistent Power Output: Provides steady power over long periods, essential for trolling motors.

Outboard Motor Battery:

• High Cranking Power: Delivers a high burst of energy to start the engine.
• Short Discharge Cycle: Designed for short, powerful discharges rather than prolonged use.
• Durability: Built to withstand the high demands of starting an engine repeatedly.

4. Applicable Boat Type

Trolling motor batteries are commonly used on smaller boats, kayaks, and canoes where quiet operation and precise control are important. While outboard motor batteries are used on a wide range of boats, from small fishing boats to larger recreational vessels.

5. Power Type

Trolling motors can be used as auxiliary propulsion systems for heavier boats, providing additional maneuverability and control, or as the main power propulsion system for lighter boats. This versatility makes trolling motors suitable for a range of boating activities. In contrast, outboard motors are designed exclusively as the main power propulsion system, providing the primary thrust needed for navigating waters, especially for larger and faster boats.

6. Location

Trolling motor batteries are typically positioned near the trolling motor at the bow of the boat. This placement helps to achieve a balanced weight distribution, particularly when the boat is in motion or when navigating in challenging conditions. Outboard motor batteries are usually installed in the stern of the boat, close to the outboard engine. This position minimizes the length of the cables running between the battery and the engine, which helps improve starting efficiency.

7. Lifespan

The lifespan of trolling motor batteries is generally longer due to their deep-cycle nature, especially if maintained properly. Lithium Iron Phosphate (LiFePO4) batteries, for example, Redodo LiFePO4 battery can last up to 10 years or more. Proper maintenance and regular charging are crucial for ensuring their longevity. On the other hand, outboard motor batteries typically have a shorter lifespan, and require regular maintenance and proper charging to maximize their lifespan.

Choosing the Right Battery for your Boat Needs

Selecting the appropriate battery for your boat is crucial to ensure optimal performance and reliability on the water. If your primary activity involves fishing or navigating at slow speeds where precision and quiet operation are paramount, a trolling motor battery is essential.

Redodo 12V trolling motor battery is designed to provide long-lasting power and reliable performance, allowing you to maneuver with ease and control. Its deep-cycle nature ensures it can handle extended use and deep discharge without compromising its lifespan. What’s more, it can offer low-temp protection to ensure battery power in cold conditions.

A Greener Energy Option: Electric Outboard Motor Battery

Recently, along with the increasingly regard on environment protection, a dedicated electric outboard motor battery is the way to go. Compared to traditional diesel or oil outboard motor engines, electric outboard motor batteries are a greener and more popular choice due to their lower environmental impact and quieter operation.

The Redodo electric outboard motor battery is an ideal option for those who require more power and efficiency. This versatile 12V battery can be configured into a 36V, 48V, or 60V battery system, providing up to 32kWh of energy. It is optimized to deliver the high bursts of power necessary for starting larger engines and ensures smooth, consistent operation of your outboard motor.

In many cases, having both types of batteries on board can offer the best of both worlds. This setup lets you enjoy the precise control of trolling motor batteries for slow-speed navigation, as well as the powerful starting capability of outboard motor batteries for main propulsion. By equipping your boat with both a 12V trolling motor battery and a 12V outboard motor battery, you ensure that you’re well-prepared for any situation on the water.

FAQs on Outboard Motor Battery

1. Does an outboard motor charge the battery?

Yes, many outboard motors are equipped with an alternator or charging system that recharges the battery while the engine is running. This system helps maintain the battery's charge, but it's important to regularly check the battery's charge level and ensure it's properly maintained to avoid unexpected failures.

2. How to connect a battery to an outboard motor?

To connect a battery to an outboard motor, follow these steps:

• Ensure Safety: Make sure the boat is on dry land and the engine is off. Wear protective gloves and eye protection.
• Locate Battery Terminals: Identify the positive (+) and negative (-) terminals on both the battery and the outboard motor's wiring harness.
• Connect Wires: Attach the positive wire (usually red) from the outboard motor to the positive terminal of the battery. Secure the connection with a battery terminal clamp or bolt.
• Connect Ground Wire: Attach the negative wire (usually black) from the outboard motor to the negative terminal of the battery. Ensure it's securely fastened.
• Check Connections: Make sure all connections are tight and free of corrosion.
• Test the System: Turn on the outboard motor to ensure everything is connected properly and the battery is providing adequate power.

By following these steps, you can ensure a reliable connection between your battery and outboard motor.

3. How often should I check my trolling motor battery?

It's a good practice to check your trolling motor battery before each outing. Ensure it's fully charged and inspect it for any signs of damage or corrosion. Regular maintenance, including checking water levels (for non-sealed batteries) and cleaning terminals, will help prolong its life and performance.

4. Can I use a regular car battery for my outboard motor?

While a regular car battery can be used for starting an outboard motor in an emergency, it's not ideal for prolonged use. Car batteries are designed for short bursts of power to start the engine, whereas marine batteries are built to handle the continuous and demanding use of marine environments. For optimal performance and longevity, use a battery specifically designed for marine applications.

Conclusion

Understanding the differences between trolling motor batteries and outboard motor batteries is crucial for maintaining the performance and longevity of your boat’s electrical systems. By selecting the right battery for your specific needs, you can enjoy a seamless boating experience on the water.