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Wie man die Batterie des Trollingmotors auflädt?

How to charge trolling motor battery?

, by Sally Zhuang, 15 min reading time

If you are inexperienced with trolling motors, you may not know how to properly maintain them. It's important to know the proper method for charging trolling motor batteries to avoid running out of power while on the water. Let's go through the process of charging your trolling motor battery and get a better understanding of what a trolling motor is. We will also briefly discuss different battery types such as AGM batteries, gel batteries, lithium batteries etc. a

What is a trolling motor?

A trolling motor is an electric motor specifically designed for use in small boats or kayaks to propel them at lower speeds. Unlike the boat's main engine, a trolling motor is quieter and operates more efficiently, allowing anglers to move silently through the water without spooking fish. It is usually mounted on the bow or stern of the boat and can be controlled manually or remotely. Trolling motors are often used in fishing because they provide precise maneuverability, allowing anglers to hold their position in specific spots or troll at desired speeds.

Trolling motors usually work with 12V or 24V systems. The specific operating voltage depends on the equipment of your boat and the engine you have.

A 12V trolling motor is powered by a single 12V battery connected to the motor. These engines are suitable for smaller boats and are generally more affordable and accessible. They provide enough power for most fishing needs, but may not be as powerful or have as much thrust as a 24V motor.

A 24V trolling motor is powered by two 12V batteries connected in series, effectively doubling the voltage and providing more power. This configuration is typically used for larger boats or when more thrust is needed, e.g. b in rough conditions or strong currents. 24V motors are generally more expensive, but offer more power and longer battery life.

Types of trolling motor batteries

Choosing the right battery for your trolling motor depends on your specific usage needs. Let's look at the different types available:

AGM batteryn

AGM batteries (Absorbed Glass Mat) are sealed lead batteries with a glass fiber mat in which the electrolyte is suspended. They are maintenance-free and extremely durable, making them suitable for harsh conditions on boats or in RVs. AGM batteries can be mounted in different positions and are leak-proof. However, they are typically more expensive and can have a shorter lifespan compared to well-maintained wet batteries.

Wet cell batteries

Wet cell batteries are flooded lead-acid batteries in which the electrolyte mixture must be filled to the appropriate level. They must be mounted upright to prevent leaks. Although regular maintenance by topping up with distilled water is required, wet batteries are more cost-effective. They offer a cost-effective option for those willing to take care of maintenance.

Gel batteryn

Gel batteries are similar to AGM batteries, but contain gel instead of a glass mat. They are great for higher temperature environments and can withstand hot, sunny climates. However, they may not charge as efficiently as AGM batteries. Gel batteries are compatible with solar panels, making them a suitable choice for boating in sunny areas.

Lithium batteries

Lithium batteries are becoming increasingly popular in the boating and fishing industries due to their numerous advantages over traditional lead-acid batteries. Lithium batteries are lighter, have a longer lifespan, and can deliver consistent power output throughout the discharge cycle. They also have a higher energy density, allowing more power in a smaller package. However, it is important to note that lithium batteries are typically more expensive than other battery types. Power Queen offers you high-quality LiFePO4 batteries of grade A at an affordable price!

Types of Battery Chargers for Trolling Motors

There are different types of trolling motor battery chargers available in the market. Here are some common types:

Manual/Traditional Chargers: These are simple chargers that require you to manually monitor the charging process. They usually have a knob or switch to adjust the charging voltage and current.
On-board chargers: These chargers are permanently installed on the boat and can charge several batteries at the same time. They are designed for convenience as you can simply plug in your boat when not in use and the batteries will automatically charge.
Portable Chargers: These are compact and portable chargers that you can take with you and connect to your trolling motor battery anywhere you have access to power. They are suitable for charging batteries outside the boat or while traveling.
Smart chargers: These chargers are also known as microprocessor-controlled chargers. They monitor the condition of the battery and adjust the charging voltage and current accordingly. They are intended to enable a more efficient and safer charging process and at the same time extend the life of the battery.

Do I need a special charger for a marine battery?

When charging marine batteries, it is important to use a charger that meets the battery's requirements. This means that the voltage and current specified by the manufacturer must be taken into account for effective and safe charging. Using a charger with lower specifications than required can result in slow charging and overheating of the charger, while using a charger with higher specifications can potentially damage the battery.

For lithium batteries, it is particularly important to use a special charger designed to provide a stable power supply. It is strongly recommended that you follow the instructions in the boat's battery manual to ensure proper charging. Below is the format with the recommended voltage for charging lithium batteries.

Charging Tips for Using Marine Battery Charger

How to charge the lead-acid/lithium marine batteries?

To ensure proper charging of lead-acid gel or AGM batteries, it is important to use a marine battery charger specifically designed for these types of batteries. These chargers ensure a smooth and controlled flow of current to facilitate charging and enable effective electron migration. Particularly advantageous are smart chargers, which can manage the entire charging process, as they help to extend the life of the battery. They are able to maintain and control the temperature during charging, preventing possible damage due to overheating.

Recommend reading: How to charge a LiFePO4 lithium battery

On the other hand, lithium-ion batteries have their own chargers. These batteries have a higher capacity compared to lead-acid batteries and correspondingly different charging requirements. Lithium-ion batteries require a charger equipped with a Battery Management System (BMS). The BMS controls various aspects of the charging and discharging process, including current flow, temperature and other important information. This protects the battery and extends its overall lifespan.

Charging a lithium-ion battery typically involves three phases: bulk, absorption and float. Each level has its own performance specifications. During the charging phase, the charger supplies the battery with the maximum permitted current, enabling rapid charging until it reaches a capacity of around 80%. At this point the charger switches to the absorption level and delivers lower power to slow down the charging process. Finally, the trickle phase occurs when the battery is fully charged but still connected to the charger. The charger keeps the voltage constant and does not actively charge the battery because there is overcharging protection.

By understanding the specific charging requirements for different battery types and using the appropriate chargers, users can ensure efficient and safe charging, resulting in optimal performance and longer battery life.

How long does it take to charge the boat battery?

The efficiency of charging marine batteries depends on various factors such as: b the charger specifications, type of battery chemistry used, and other considerations. Marine batteries can be divided into several types, with lead-acid and lithium-ion batteries being the most common. Each battery type has its own charging specifications. In general, lithium-ion batteries have the advantage of being able to charge faster compared to other types of batteries.

The amperage of the charger is an important factor to consider when aiming for effective and fast charging. It is recommended to use a charger with an amperage suitable for marine batteries. According to market information, the typical charging time for a ship battery charger is between 4 and 6 hours. However, the use of fast chargers can significantly shorten this duration as they enable a better flow of current through the discharged cells. In some cases, charging time for lithium-ion batteries can be reduced to 2-3 hours or even less. Choosing an unsuitable charger can result in longer charging times. Therefore, it is important to choose one that suits the specific battery type.

Temperature and maintenance should also be considered as they can affect the charging time and overall performance of the battery. New and well-maintained batteries generally have better specifications and charging capabilities. Extreme temperatures, whether too high or too low, can disrupt the flow of electrons during charging, potentially causing problems.

By carefully considering charger specifications, battery chemistry, temperature conditions and regular maintenance, you can optimize charging efficiency and extend the life of your marine batteries.

How to charge the How to charge the trolling motor batterycharge?

To charge a trolling motor battery, you can follow these steps:

Safety precautions:

Before you begin, make sure you are in a well-ventilated area with no open flames or sparks. Also wear safety glasses and gloves.

Disconnect the battery from the trolling motor

Turn off the trolling motor and disconnect it from the battery terminals. It is important to avoid accidental electrical discharge during charging.

Determine battery chemistry

Check your battery's label or consult the manufacturer's specifications to determine battery chemistry (e.g. b Lead acid, AGM, gel or lithium ion).

Choose a suitable charger

Choose a charger that is specifically tailored to the chemistry of your battery. Different chemicals require different charging profiles to ensure efficient and safe charging.

Connect the charger

Connect the positive (red) terminal of the charger to the positive terminal of the battery and the negative (black) terminal to the negative terminal. Ensure a secure connection as loose connections can result in ineffective charging.

Set the loading rate

Depending on your charger, you may have the option to adjust the charging rate. Refer to the charger instructions or battery manufacturer's guidelines to select an appropriate charging rate. Generally, a lower charging rate is recommended for better battery health and longevity.

Start the loading process

Once the charger is connected and the settings are adjusted, you can start charging by turning on the charger. The charger begins to supply power to the battery.

Monitor the loading process

Keep a close eye on the charging process. Some chargers have built-in indicators that show progress. It is important not to overcharge the battery as this may cause damage or shortened battery life.

Loading completed

Charging time varies depending on factors such as battery capacity and charging rate. Once the battery is fully charged, the charger may automatically enter trickle or trickle charging mode. If your charger does not have this feature, disconnect the charger when the battery is fully charged.

Remember that it is important to follow the manufacturer's instructions and guidelines for your battery and charger to ensure safe and effective charging.

Can I charge a trolling motor battery with solar panels?

Yes, you can charge a trolling motor battery with solar panels. Solar panels can be a convenient and environmentally friendly way to charge batteries, especially in remote or off-grid locations. To do this, you need a solar panel, a solar charge controller and the necessary cables and connections.

Here are the steps you need to follow:

(1) First connect the battery to the MPPT
(2) Connect the DC load to the MPPT (optional, can be used or not)
(3) Connect the solar panel to the MPPT
(4) Communication port (optional, selectable or not)
(5) Remote temperature sensor (optional for lead-acid batteries)

How to Charge Trolling Motor Batteries on Cold Winter Days

In winter, we strongly recommend you to upgrade the battery to a lithium battery with low temperature protection functions, such as the Power Queen 12V 100Ah LiFePO4 lithium battery, which could be an excellent option for winter use. By automatically switching off the charging process at temperatures below freezing, the life of the battery is extended. Upgrading to a lithium battery would optimize the performance and reliability of your trolling motor setup during the colder months.

When charging trolling motor batteries during cold winter days, it is important to take some precautions to ensure their longevity and optimal performance. Here are some steps you need to follow:

Check battery temperature

Before starting charging, make sure the battery temperature is above freezing. Charging a frozen battery can cause irreparable damage. If the temperature is below freezing, bring the battery indoors and allow it to warm up before charging.

Choose a suitable charging method

Using a smart or temperature compensated charger is recommended for cold weather charging. These chargers adapt the charging voltage to the temperature of the battery and thus optimize the charging process.

Use a low current trickle charge

Cold temperatures can affect battery capacity. Therefore, it is recommended to charge the battery with a lower current for a longer period of time. This slow charging helps the battery maintain its charge and prevent damage.

Keep the battery warm while charging

If possible, place the battery in a warmer environment while charging. This can be in a garage or a well-insulated shed. Avoid exposing the battery to freezing temperatures while charging.

Provide adequate ventilation

Ensure there is adequate air circulation around the battery while charging. This helps dissipate the heat generated during charging and prevents the formation of potentially harmful gases.

Monitor the loading process

During charging, regularly check the voltage and charge status of the battery. This ensures that the battery is charged properly and prevents overcharging.

Fully charge the battery

In winter it is even more important to fully charge the batteries. This helps maintain its capacity and prevents sulfation, which can occur if the battery is left partially charged for an extended period of time.

Following these steps will help you properly charge trolling motor batteries on cold winter days, ensuring their longevity and optimal performance.


Properly charging your trolling motor's battery is critical to maintaining its performance and extending its lifespan. By following this guideline, you can ensure that your battery is charged safely and efficiently so that there is no loss of power while on the water.

Remember to consult your battery manufacturer's guidelines for specific charging requirements and always put safety first when handling batteries. With a well-charged trolling motor battery, you can enjoy a smooth and productive fishing experience every time you hit the water.

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