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The Best Battery for Kayak Fish Finder

The Best Battery for Kayak Fish Finder

Fishing is no exception when it comes to technological advancement. The most sought fishing accessories are the fish finders for a good reason. If you want to identify the ideal fishing spot, these devices are great at improving accuracy. You wouldn't need to do a lot of guesswork that is involved with finding a fishing spot.

Tending to fish while in a kayak, you will need the best battery for your fish finder that has a lot of power in a small size, to be able to last your entire trip without any problem. This article will give you information on what you need to know before buying and battery and a look at thebest battery for kayak fish finder

Quick Top 5  Kayak Fish finder Batteries:

*Keep reading for the fulling buying guide or jump straight to the reviews!

The Required Battery Capacity

This is the first step before buying your fish finder battery. You need to determine its capacity. By multiplying the desired operating time (hours) with the fish finder current (Amperes), you get the battery's capacity which is given in Ampere-Hours. When powered from a 12V source, most fish finders use around 1Amp of current or less.

Smaller portable models use less current that 1Amp while bigger ones such as fish finders/GPS combo use more than that. When using a kayak for fishing, you would normally spend no more than 10-12 hours or a shorter period of between 3-4 hours. You can recharge the battery once you return to the shore or larger boat.

Theoretically, if you prefer longer trips of 10-12 hours, you will need a battery capacity of between 15-18Ah while for a shorter trip between 3-4 hours, you will need a capacity of 4.5-6Ah. In real life though, capacity is lower than theoretical, therefore, you need to use larger batteries depending on the condition and age of the battery. When you are buying a battery for your fish finder, increase the capacity by 20-25%.

The Type of Battery You Will Need

There are various types of batteries to power a fish finder including the following:

  • Sealed lead acid (SLA) – These types of batteries are mostly used as a deep cycle or dual purpose marine batteries. They are leak proof, cheap, come in various shapes and sizes and operate in any position. However, they are the heaviest batteries used on kayaks.
  • Nickel Cadmium (NiCd) – They are lighter than SLA batteries and provide high levels of current. They are not environmentally friendly as they have a strong effect on memory and other issues.
  • Nickel Metal Hydride (NiMH) or lithium batteries – They are lightweight and provide the same capacity. Lithium batteries are 5-6 times lighter while NiMH is 3-4 times lighter than SLA of the same capacity. However, they are more expensive and require special chargers.

Fishfinder Battery Box

If you like spending every possible free time fishing from your kayak, put your batteries in a power center box which has a proper electronic controller. Then connect your small wind turbine or solar panel and power your fish finder. SLA batteries need to be protected from water, cold wind and sun. To improve stability, store the batteries in the watertight compartments especially if you have a larger battery.

Charging your fish finder batteries

You should use a charger designed for a specific battery to charge it. If you use the wrong charger, the batteries will be destroyed and damaged, and it can even lead to injuries due to possible fire, smoke, heat and even explosion.

You can use ‘fast chargers' to charge an SLA battery overnight, but you should know that these ‘fast chargers' tend to reduce the lifetime of the battery. Lithium and NiMH batteries can be charged in under an hour, but you can prolong their lifetime by charging them 4-6 hours.

The Best Battery for Kayak Fish Finder  

The alloy for this rechargeable battery is primarily constructed from lead and calcium as well as absorbed glass mat technology which enables it to be operated with minimum maintenance and is spill proof. With a weight of 4.1 pounds, you can use this battery for other uses such as mobility scooters and alarm systems. 

The sealed post in the battery helps prevent corrosion extending its lifetime making it thebest battery for kayak fish finders. Once the batteries are delivered to you, they are fully charged and ready to connect to your fish finder, and you are ready to go fishing in your kayak.


  • Has a variety of uses.
  • Advanced technology is used in its construction increasing its lifespan.
  • Easy to use.
  • Arrives charged and ready to use.


  • Some batteries may not be fully charged when delivered.

For your float and cyclic applications, Mighty Max SLA Batteries uses modern and robust calcium-alloy to provide remarkable performance and longer service life. It comes in a 2-pack and weighs 11 pounds. This spill-proof battery has a high discharge rate, longer lifespan, operates over a wider level of temperatures from low to high and also has a deep discharge recovery. You can mount this battery in any position and resists any vibrations and shocks. It comes with a 30-day refund policy with a 1-year warranty.

An Absorbent Glass Mat technology is used to design this battery enabling it to be used in enclosed and indoor environments with low maintenance and leaking. Apart from powering your fish finder, you can use this battery for consumer electronics, engine starters, hunting, motorcycles, emergency lighting and many more.


  • It has low maintenance.
  • It is durable.
  • Resists shock and vibrations.
  • Has a variety of applications.


  • Will not charge with the suggested charger after a while, poor quality control.

Chrome SLA Batteries have gone through an exhaustive testing for them to handle any situation. This rechargeable battery has a variety of applications from alarm systems to mobility scooters. The acid inside this battery is designed with a top Absorbed Glass Mat technology for low maintenance and to prevent spillage.

Chrome SLA Battery lasts longer and is corrosion resistant because of its patented sealed post. This battery weighs 4.1 pounds and is fully charged when delivered to you. You just need to connect to your fish finder and ready to go fishing. It comes with an 18-month warranty with a 60-day refund policy.


  • It is durable.
  • User-friendly.
  • It has optimal performance and total reliability.
  • It is vibration resistant.


  • Some batteries may have a quality control issue.
  • The battery may not last long as said.

This battery delivers power when you need it. Mighty Max Battery is constructed with a high spec and durable calcium alloy to provide exceptional performance and service life for both your cyclic and float applications. The top technology used in this battery enables it to be used in an enclosed environment without spillage and maintenance.

It operates in both low and high temperatures and has a deep discharge power, meaning you can go fishing at when it’s cold or hot. This long-lasting battery resists both the vibrations and shocks that may occur and comes with a 1-year warranty with a 30-day refund policy.


  • High discharge power.
  • Can be mounted in any position.
  • Comes with a 30-day refund policy.
  • Shocks and vibration resistant.


  • The connectors may be weak and break easily.

To ensure for superior performance, Universal Power Group 12V 9Ah Battery is designed using Absorbent Glass Mat technology. The valve is regulated and has a spill proof construction to ensure that you fish in any position safely.

It comes with a charger and alligator clips. It resists any vibrations and shock and has a wider variety of application including photography, motorcycles, golf carts, lawn and garden tools, access control devices, security and emergency lighting.


  • Free maintenance.
  • Resists vibration and shock.
  • Spill-proof.


  • A few quality control issues in some batteries.


When it comes to spending a day or weekend fishing on your kayak, you can use any one of the above batteries to power your fish finder or any other devices you may need for your trip.

To find a battery that fits your needs and has the most value for your money, you need to weigh the pros and cons of each of the battery before you can decide on the one.

Regardless of the one you choose, you are sure to find thebest battery for kayak fish finder if you stick to the tips you learned from this article. Let us know in the comments below which one you went with! 


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