Best battery for kayak fish finder of 2022

Product Capacity Weight Price
1.	ExpertPower LiFe PO4 (Lithium Iron Phosphate) 1. ExpertPower LiFe PO4 (Lithium Iron Phosphate) 5 Ah 1.7 pounds price
Miady Rechargeable LiFe PO4 Battery Miady Rechargeable LiFe PO4 Battery 6 Ah 1.65 Pounds price
CHROME SLA BATTERY for Fish Finder CHROME SLA BATTERY for Fish Finder 7 Ah 4.1 pounds price
Mighty Max ML-9-12 SLA Battery Mighty Max ML-9-12 SLA Battery 9 Ah 5.44 pounds price
Power-Sonic PS-1290 Power-Sonic PS-1290 9 Ah 5.98 pounds price
ExpertPower EXP1270 ExpertPower EXP1270 7 Ah 4.3 pounds price

Kayak fishing is about the experience more than it is about the actual catch. At least, that’s how we view it. The ability to reach hidden or untouched spots where no boat can go, the wilderness around you, and the feeling that you get when you are so close to the water is something that only a true fan can appreciate. Kayak fishing provides an excellent way to enjoy the outdoors and appreciate nature’s beauty.

For experienced and avid kayakers and beginners alike, kayak fishing is appealing for many reasons. The affordability aspect, the fact that you can reach places that motorboats can't, and the outdoorsy activity make this sport more popular among adventure seekers.

Kayak fishing might seem hard for the first few times if you are a beginner, but it comes with many advantages. Besides enjoying the outdoors and having a relaxing time, you also get some much-needed exercise. Paddling and balancing are essential, given the fact that kayaks don't have motors and can't go fast without a bit of your sweat.

Kayak fishing can be an inexpensive activity once you get yourself some fishing gear. If you like fishing and already have your gear ready, all that's left to do is find a good spot and cast your lines.

Whether you are a beginner or want to add to your fishing gear, one of the most useful kayak accessories is a fish finder. This essential accessory can give you a lot of valuable information on the water, such as depth, structure, fish, and temperature. Fish finders can also come with GPS. If you already own a fish finder, you know that the most crucial aspect is battery life. You want to keep it up and running for as long as possible, and to do that, you need a power source, preferably one that isn't taking all the yak's space.

Because there's not much space in a kayak, you need a battery that provides lots of power and comes in a small package. We will explore the options, the different battery technologies, and the pros and cons of choosing one over the other.

First of all, all types of battery technologies have upsides and downsides. Your buying decision might depend on factors like price, performance, charging cycles, weight, and so on. Ultimately, you will have to compromise and settle with the best option for your current needs.

Let’s talk about what you need to know before adding a battery to your fish gear.

We’ve made a short guide on what to look for when searching for the best battery for your kayak fish finder.

Type of battery

There are a few battery types that you might want to look into, but honestly, we want to focus on the two main types: Sealed Lead Acid (SLA) and Lithium batteries.

SLA (Sealed Lead Acid)

This is the most common battery in the industry, but it has its pros and cons. The good news is that SLA batteries are cheap. You can easily find them, and you won't have to break the bank to buy them. The downside is that they are heavy. They take more space, so if you think about getting two of these and throwing them into your yak for backup, they might affect the balance and carrying capacity of your kayak. Another downside is that they don't perform well in cold weather. Finally, they tend to discharge quicker because the power delivery is not continuous. Usually, it starts out strong, but it diminishes quickly.

Lithium batteries

There are several types of Lithium batteries. Lithium-Ion, Lithium Phosphorous, and Lithium Iron. They are similar, but they have different formulas for generating power. Lithium batteries have some advantages compared to SLAs. First, they are slim and lightweight, so you can always get more and stash them anywhere. They also provide the same amount of power until the battery is drained. This means you have 100% performance from start to finish. Lithium batteries also deal with cold weather much better than SLAs. The downside is that they are expensive. Although this technology isn't new, the upfront cost can often drive consumers to cheaper alternatives, even if that means lower performance or several other drawbacks.

Charging time

If you are an active fisherman, you want fast charging times, obviously. Different battery types have different charging times. Lithium-Ion batteries have a higher efficiency rating, so they also have a faster rate of charge.

Carrying case

After you choose your battery type, make sure you include a carrying case on your list. Batteries need to stay dry to avoid unwanted accidents. Look for a battery that comes with a waterproof case or buy it separately to ensure your battery is adequately contained.

We've done our research, so you can form an idea of what battery to choose for your kayak trips, fish finder, and other fishing gear that you need for a successful day out in the middle of nature. Here are some of the best batteries that we can recommend.

Best Products of 2022

If you don't want to go through the hassle of lifting heavy SLA batteries, you will certainly like this lightweight alternative. The LiFe PO4 Lithium battery is not just lightweight, but it takes much less space than usual SLA batteries. Weighing only 2.7 pounds, you can easily mount this rechargeable beast battery into your kayak. It can power just about anything, and it provides 2500-7000 cycles and 10 years of lifetime. Compared to a standard SLA battery that provides only 200-500 cycles and three years lifetime, this one is clearly the winner.

The price is a bit high, as you would expect when you purchase a Lithium battery, but the benefits are various. If you can stretch your budget a little bit, rest assured that you will definitely have no regrets.

Another great advantage is power efficiency. This 12.8V 10 Ah Lithium battery can hold a flat discharge above 12V for up to 90% of its capacity, compared to only 50% in the SLA's case.

Like most LiFe PO4 batteries, ExpertPower has a Battery Management System (BMS). This is the "brain" of your battery that helps and protects it from overheating, overcharging, overloading, deep discharging, or other issues. The BMS automatically turns off the battery in the event of a ground fault or short circuit.

This powerful battery can be used for multiple purposes. You can use it at home or outdoors, to power a fridge, or a motor. This one also has a low-temperature cut-off. If you are using it at a temperature below 32 degrees Fahrenheit, it should automatically cut off the power. It is essential that this system works because, even if battery technology came a long way, you could still risk damaging the cells if you charge it in freezing temperatures.

Overall, we like this lithium battery, and we think it’s the next step to take if you don’t want heavy SLA batteries in your yak. It solves multiple problems at once. It’s lightweight, powerful, and the capacity and power efficiency are definitely its main strengths. Yes, it is a bit expensive, but we think it’s well worth the extra dollar for the benefits that it can bring to your experience.


  • Power efficiency
  • 2500-700 cycles
  • 10 years lifetime
  • Hold a flat discharge above 12V for up to 90% of its capacity
  • Lightweight (2.7 pounds)
  • Multiple purpose use
  • Built-in BMS
  • Saves space


  • Expensive

If you want something as lightweight and small as possible, this Lithium Iron Phosphate battery is for you.

It comes at a great price, so you won't have to stretch your budget at all. Of course, it is not as capable as other batteries that are larger and higher in capacity. Still, for powering your fish finder, it is more than enough.

It weighs only 1.65 pounds and it’s 3.97 inches tall, so it is way smaller than you can see in the pictures. Being this small, you can also opt to buy multiple units and stack them for convenience. It’s a 12.8 V and 6 Ah battery, but the average charge/discharge rate is 1.2 AH. You can go up to 6Ah, but it will cost you some discharge cycles. Speaking of charging cycles, it goes up to 2000.

Some customers say that this is more than enough for kayak fishing. They managed to get two days of power with no charging for the fish finder, which tells you what you can achieve by purchasing this type of battery. Of course, this is not a starter battery, so the applications are limited. Still, if you don't mind it, this little battery comes with many advantages. It saves you a lot of space, as it fits in the palm of your hand, and it is so lightweight that you can buy multiple units, as we mentioned.

Another great thing about this battery is its charging time. It takes only two hours to fully charge it, and you are ready to go. It also has a low self-discharge rate, reaching 80% after eight months, so in terms of lifetime, you certainly get a decent return on your investment. This battery also has an integrated BMS, so it helps in the case of overcharging, overheating, and more.

All in all, this one is a good purchase if you want to skip the heavyweight of a standard SLA battery.


  • 2000 charging cycles
  • Can be fully discharged without losing capacity
  • Very lightweight and small
  • Good price point, affordable
  • Low self-discharge rate
  • Fully charged in two hours
  • Integrated BMS


  • Average charging/discharging rate of 1.2 Ah. It goes up to 6 Ah, but at the cost of fewer cycles

This battery if perfect for less-intensive tasks, like charging your fishfinder. At 12V and 7 Ah, this one will give your fishfinder about 16 hours of life, so if you don't plan on starting a powerful engine or using it for other more intensive requirements, this Chrome SLA battery is just what you need.

If features a T1 terminal, so make sure it fits your purpose. It is lightweight compared to other SLA batteries of the same power and size, so it would fit perfectly inside your kayak without affecting its capabilities and balance.

The AGM technology makes it spill-proof, and it comes fully charged, so you just have to plug it in, and it’s ready to use. It comes at an affordable price point too.

If there is ever something wrong with your battery, just contact the seller because it has 60 days money-back guarantee and 18 months warranty. Customers are usually purchasing this one specifically for their fish finders, and the majority of them are pleased with the life cycle and power of this SLA battery.

The case is also shock and vibration-resistant, so it's perfect for a fishing day. As for the battery life, some users managed to keep it running for approximately nine months, while for others, it lasted for a longer time.

At the end of the day, we like this SLA battery for its simplicity. It is great for all gadgets that don’t need high-power output, it comes at a good price point, and it doesn’t take much space.


  • Small and relatively lightweight for an SLA battery (4.1 pounds)
  • AGM technology
  • Spill-proof
  • 60 days money-back guarantee
  • vibration and shock-resistant
  • good price point


  • doesn’t have a long-life
  • it could use a carrying handle

If you don’t need expensive Lithium batteries and you are a fan of SLAs, this 12V 9Ah battery will be enough to power your kayak fish finder.

This battery comes at a great price point and packs enough power to be used for multiple purposes. You can use it as an engine starter, for consumer electronics, and even gardening tools. This is where you can benefit from

It is a bit heavy at 5.44 pounds, but it won't take much space because it is still a small battery pack. The manufacturer promises high performance in low and high temperatures. It can also be installed in multiple positions. The battery is spill-proof due to the AGM technology. However, do not ever install it upside down. The self-discharge is among the lowest when it comes to battery systems, so you should expect good performance rates.

Some users who had installed this battery in their kayak said that it lasted a day powering the fish finder. Others experienced half a day of charging juice. If you need to power multiple gadgets or need it to work correctly for a more extended period, you can also opt for a 2-pack, 4-pack, and even more.

This SLA battery also features deep discharge recovery. If you drain it too much, you won't have to wait very long before it recovers the lost energy.

Overall, this 1-pack is a great deal. It has a good price point, it's spill-proof, and performs well in high and low temperatures. It's not extremely heavy, and it's relatively small, so it fits perfectly in your yak without affecting its balance.


  • Good price point
  • Shock-resistant
  • Spill-proof
  • Deep discharge recovery
  • AGM technology
  • Can be installed in multiple positions (don’t install it upside-down)
  • Multiple-use
  • Available in multiple packs


  • It tends to die quickly (doesn’t have a long life – some users had it working for approximately 9 months)

This is another excellent option when it comes to powering your fish finder. You don't need a high-power battery, just an efficient one that you can count on when you are out and about.

This SLA battery has 12V and 9 Ah, which makes it perfect for your fishing gear. It has a T2 terminal, and you can also use it to power your house alarm or a UPS if you need it.

The AGM technology makes it spill-proof and perfect to install in multiple positions (except upside-down, of course). At 5.98 pounds, this battery is a bit heavy, but nothing unusual for an SLA.

For this small package, 9 Ah offers the highest energy density compared to other manufacturers using SLA technology, so you get more power in the same package. This performance is obtained without increasing the weight and dimensions. This also means that you get a longer battery life from fully charged to zero.

There are many things to like when it comes to the Power-Sonic, and if you are familiar with SLAs, we think this one deserves your full attention. It might be the best combination of power, longevity, and size. There are, however, customers that experienced a shorter life span than they expected, but honestly, it widely depends on how you use it and the application.


  • Affordable price point
  • AGM technology (spill-proof)
  • High-energy density
  • Can be installed in multiple positions
  • Small package, reduces in size
  • More power in the same small size


  • A bit heavy
  • Life span might vary depending on the application.

Yet another SLA battery, but this time at a lower price. At 12V 7 Ah, you can get more than 260 cycles depending on the temperature and 100% Depth of Discharge. You can still charge it up to 1200 cycles, but the capacity will be decreased to 60%. The temperature should be constant, meaning that if you ever use it in high or low temperatures, the performance might be affected. The ideal temperature for maximum performance is 77 degrees Fahrenheit. Its life span varies between three and five years. However, we think it is an excellent choice for the price.

It has a low self-discharge rate of 3% a month at 77 degrees Fahrenheit.

For a regular fish finder, you should expect to get over 20 hours of use in one charge, so it is a pretty good value for the money. The SLA technology is known to be slow in charging, so it would take approximately 12 hours to fully charge.

The rugged construction makes this battery highly resistant to shocks. It features a non-conductive ABS plastic that can resist vibrations, chemicals, and heat. The AGM technology prevents spilling and allows you to install it in multiple positions.

At 4.3 pounds, this is a lightweight box that you can easily install in your kayak without affecting the carrying capacity or the balance.


  • Excellent price point, affordable
  • Not too heavy
  • Low self-discharge rate
  • High performance
  • Over 20 hours of use in one charge
  • Rugged case, impact-resistant
  • AGM technology, leak-proof
  • Multiple-use


  • The life span will shorten if you use it for other highly draining applications.

Final Words

In the hope that you know more about battery technologies and their applications, we gathered a short FAQ list that might help you further. If you still have questions, here are some of the



The best option if you are not on a budget is to get a Lithium-based battery. These are significantly lighter in weight, smaller in size, and can handle far more charging cycles than older SLA technology.


Each battery has its own specifications. With SLAs, you can generally expect long charging times and approximately 20 hours of use, depending on the power that you fish finder needs, as not all of them require the same amount. Lithium batteries have a higher energy density than SLAs. Regardless of the technology you decide to choose, what will determine the time of use is directly proportional to the capacity of your battery (e.g., 7/8/9 Ah), assuming that the voltage is the same (12V).


Most batteries are made to be splash-proof, but not completely waterproof. If you are planning to use it in your kayak, you might need to think about buying a waterproof case…just in case!


Try to keep your battery fully charger when it is not in use. Get into the habit of plugging it in as soon as you return from your trip. Whenever possible, try to discharge it up to 50% only, as SLA batteries are not meant to be fully drained. Lastly, it’s always better to use a smart charger that can charge your battery in stages and prevents overcharging.