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Welche Batterie benötige ich für meinen Fischfinder?

Which battery do I need for my fish finder?

, by Sally Zhuang, 10 min reading time

Owning a fish finder to identify underwater schools using reflected sound energy greatly improves the fishing experience! However, it is important to ensure a reliable power source. If you are looking for the best fish finder battery, you have come to the right place. If you are also not sure which battery type is suitable for your fish finder, you have come to the right place!

This article explores various power options for fish finders and shares our top picks.

What is a fish finder?

A fish finder is a device, usually a 12V battery system, used by fishermen to locate fish underwater. It sends sound waves into the water and then detects the reflected signals. This allows fishermen to see a graphical representation or display showing the location of fish, underwater structures and the contour of the seabed. Fish finders are essential tools for recreational and commercial fishermen as they help identify the best fishing spots and improve catch rates. Technology has advanced over the years and modern fish finders are often equipped with GPS, maps and other features to enhance the fishing experience.

Factors to consider when choosing fish finders Battery

When selecting a battery for a fish finder, several factors should be considered to ensure optimal performance and reliability:

Performance Requirements

Consider the power consumption of the fish finder and any additional devices it may power, such as: b Transducers or GPS modules. Choose a battery with sufficient capacity to cover the power requirements of the fish finder for the desired operating time.

Voltage and Compatibility

Make sure the voltage of the battery meets the requirements of the fish finder. Additionally, consider compatibility with the device's connectors and power input specifications to avoid compatibility issues.

Battery Type

Evaluate the advantages and limitations of different battery types, such as lead-acid, lithium-ion, AGM and gel cell batteries, taking into account factors such as weight, lifespan, maintenance and recharging capabilities.

Capacity and runtime

Assess the amp-hour capacity (Ah) of the battery relative to the expected runtime of the fish finder. Choose a battery that can provide enough power for the intended period of use.

Portability and weight

Depending on your fishing configuration and mobility needs, consider the weight and portability of the battery, especially if you plan to transport it for long periods of time or use it in a kayak or small boat.

Durability and waterproofness

In marine environments, ensure the battery is built to withstand water and corrosion. Choose a battery with a durable and waterproof case to ensure reliability in wet conditions.

Rechargeability and charging options

Assess battery charge cycle life and availability of compatible charging solutions, such as: b Solar chargers or shipboard charging systems to maintain battery performance over a longer period of time.

Security aspects

Consider the safety features and requirements associated with the selected battery type, particularly when used in marine environments, and ensure that guidelines for proper handling and maintenance are followed.

By carefully considering these factors, anglers can select a fish finder battery that best suits their specific needs and ensures uninterrupted operation and optimal performance on the water.

Fish finder battery types

  1. Lead-acid batteries

Due to their affordability and reliability, lead-acid batteries are often used to power fish finders. They are available in different sizes and voltage values ​​and are suitable for different fish finder models. These batteries are relatively heavy and bulky, but provide a robust and consistent power supply. They are also tolerant of overcharging and can withstand low temperatures. However, lead-acid batteries require regular maintenance, such as: b checking electrolyte levels and ensuring proper ventilation, and they have a shorter lifespan compared to some other battery types.

  1. Lithium-ion batteries

Lithium-ion batteries are a popular choice for those looking for a lightweight and powerful power source for fish finders. They are known for their high energy density and allow for extended use without placing significant strain on the equipment. These batteries also have a longer lifespan, require no maintenance, and are less likely to self-discharge compared to lead-acid batteries. However, they are generally more expensive than other types of batteries, and there are safety concerns associated with their use, such as the risk of thermal runaway if handled or charged improperly.

  1. AGM (Absorbent Glass Mat) batteries

AGM batteries are equipped with a glass mat separator to absorb the electrolyte, providing a maintenance-free and leak-proof energy solution. These batteries are known for their longevity and ability to withstand deep discharges, making them suitable for marine environments where fish finders are commonly used. They also have low internal resistance, which enables efficient energy transfer. Despite their advantages, AGM batteries can be more expensive than lead-acid batteries and they can be sensitive to overcharging, which may require the use of a special charging system.

  1. Gel cell batteries

Similar to AGM batteries, gel cell batteries are maintenance-free, leak-proof and extremely long-lasting. They are known for their deep cycling ability, making them an excellent choice for providing reliable, long-lasting power to fish finders. Gel cell batteries offer a slow discharge rate and are resistant to vibration and shock, which is beneficial for marine applications. However, they are sensitive to overcharging and may require a specific charging profile to avoid damage. Additionally, the initial cost is generally higher compared to lead-acid batteries.

When selecting a battery type for a fish finder, it is important to consider factors such as battery life, waterproofing, weight, compatibility, cost and the fish finder's specific operating requirements. Thorough research and understanding the pros and cons of each battery type will help make an informed decision based on individual needs and preferences.

Why are lithium batteries the best choice for fish finders?

Lithium batteries are often considered the best choice for fish finders due to several key advantages:

Light and Kcompact

Lithium batteries are significantly lighter and more compact than conventional lead-acid batteries. This makes them ideal for applications where portability and weight are important factors, such as on small fishing boats or for anglers who need to transport their equipment long distances.

High energy density

Lithium-ion batteries offer high energy density, meaning they can store a large amount of energy in a relatively small and lightweight package. This allows fish finder users to have longer operating times between charges, which is critical on extended fishing trips or when access to charging options is limited.

Long lifespan

Lithium batteries typically have a longer lifespan and provide consistent performance over a longer period of time compared to lead-acid batteries. This can result in cost savings in the long term as lithium batteries may require less replacement and maintenance compared to other battery types.

Fast charging capability

Lithium batteries can be charged faster compared to other battery types, allowing for shorter turnaround times between fishing trips. This is particularly beneficial for anglers who are short on time and need to charge their batteries efficiently.

Maintenance-free operation

Lithium batteries require minimal maintenance and are generally more user-friendly than lead-acid batteries, which may require regular electrolyte checks and other maintenance tasks. This makes lithium batteries a convenient and hassle-free power source for fish finders.


Lithium batteries require careful handling and charging procedures to reduce the risk of thermal runaway, fire hazards and other safety issues. To ensure the safe and reliable operation of lithium batteries, proper charging equipment, storage and usage guidelines are essential. Users should be aware of the potential risks and follow recommended safety practices to minimize the likelihood of accidents or damage caused by lithium battery problems.

Best fish finder battery for your boat or kayak

When looking for the ideal fish finder battery for your boat or kayak, there are several key features to consider. The battery should be lightweight, water-resistant, long-lasting and easy to transport.

In addition, it is crucial to evaluate the battery's amp-hour rating and compare it to your fish finder's power draw to ensure adequate power for consistent operation.

We recommend you consider the Power Queen 12V 50Ah or 100Ah as an excellent choice for your fish finder battery. These batteries offer a balance of power, capacity and reliability suitable for marine applications.

How long can a fish finder last with a 12 Volt Battery operated?

Considering that most fish finders use around 2A, it is quite possible to run them for around 50 hours on a standard 100Ah battery. In contrast, typical trolling motors use about 1A per pound of thrust at maximum power. For example, if a 50-pound thrust motor is run at high power for two hours, the battery is likely dead. To ensure battery longevity, it is essential to avoid discharging beyond 80 to 50% of capacity and to recharge promptly after use.

Does a fish finder need its own battery?

A fish finder does not necessarily need its own battery. In many cases, fish finders can be powered by the same marine battery that is used to power other electronic devices on a boat, such as navigation devices, radios, or lighting.

However, using a dedicated battery for your fish finder can offer some benefits. For example, a separate battery can ensure that the fish finder's power supply remains stable and uninterrupted, especially in situations where other electronic devices may draw significant amounts of power from the main battery.

In addition, using a dedicated battery for the fish finder can simplify wiring and power management, allowing for easier installation and maintenance.

Can you operate a fish finder with a deep cycle battery?

Yes, a fish finder can be powered by a deep cycle battery. Deep cycle batteries are specifically designed to provide consistent, consistent power over extended periods of time, making them suitable for powering electronic devices such as fish finders, trolling motors and other marine electronics.

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