Best Battery For Fish Finder In 2021 Reviewed

UPDATED 29 JANUARY 2021

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by Robert Ceran

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Knowing what kind of kayak fish finder battery to use for your fish finder is vital. If you choose the right battery, you can make sure it’ll last the entire fishing trip without running low. In addition, you also need to know how long you can expect your battery for fish finder to last before you need to recharge it. 

In this article we’ll go over the best fish finder batteries, and discuss their strengths and weaknesses. While there’s quite a wide range of different fish finder batteries available, the best one to choose is one that’s lightweight, easy to transport, and delivers sufficient battery power from start to finish of your entire fishing expedition.

 

Best fish finder batteries in 2021 reviewed

ModelImagePriceBattery typeVolts/amp hoursOur verdict
ExpertPower 12V 10AH LithiumLithium12V/10AHBest overall performance
Dakota Lithium 12V 10AHLithium12V/10AHBest runner up lithium model
Dakota Lithium 12V 7AHLithium12V/7AHBest budget lithium model
ExpertPower EXP1270 12V 7AHSLA12V/7AHBest SLA model
Chrome Battery SLA 12V 7AHSLA12V/7AHMost durable SLA model
Mighty Max YTX20-BS 12V 18AHSLA12V/18AHLeast reliable model
Power Sonic 12V 7AHSLA12V/7AHSolid runner up performance
Universal Power Group 12V 35 AHSLA12V/35AHBest SLA model to power all your devices at the same time

 

The table compares the top 8 models side by side. Now let’s and look at each of the models in more detail.

 

1. ExpertPower 12V 10Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery

Photo of ExpertPower 12V 10Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery

The Expert Power Lithium 12V 10AH is currently one of the best, if not the best lithium fish finder battery on the market.

This battery is based on Lithium Iron Phosphate (LiFePO4) technology, and its biggest advantage is that its charge lasts more than twice as long as a standard SLA battery. That means you don’t need to worry about running low during your fishing trip, even if you’re on the water all day long. It can actually last for 2-3 kayak fishing trips before it needs to be recharged, though most anglers prefer to recharge it after every fishing trip.

In addition, theExpertPower Lithium is almost 70% lighter than SLA batteries of equivalent size, and lasts for 2500 -7000 recharging cycles, whereas SLA batteries only last for 400 recharging cycles on average, which means its lifespan is 6 – 17 times longer.

So, even though the cost of this battery is a little higher than that of SLA batteries, the value you get is clearly a lot higher with the ExpertPower 12V 10AH Lithium.

Our verdict: best overall battery.

If you purchase the ExpertPower Lithium 12V 10AH battery, remember to use a lithium battery charger to recharge it. We recommend the BikeMaster Lithium Battery Charger.

 

2. Dakota Lithium 12V 10AH Battery

Photo of Dakota Lithium 12V 10AH Battery

The Dakota Lithium 12V 10AH battery is another excellent lithium fish finder battery on the market, and like the ExpertPower battery it is based on Lithium Iron Phosphate (LiFePO4) technology.

The Dakota Lithium is 50% lighter than SLA batteries on average, and lasts for a miniumum of 2000 recharging cycles, whereas SLA batteries only last for 400 recharging cycles on average, which means its lifespan is 4.5X longer than that of an SLA battery.

Our verdict: best runner up lithium battery.

If you purchase the Dakota Lithium 12V 10AH battery, remember to use a lithium battery charger to recharge it. We recommend the BikeMaster Lithium Battery Charger.

 

3. Dakota Lithium 12V 7AH Battery

Photo of Dakota Lithium 12V 7AH Battery

The Dakota Lithium 12V 7AH battery is very similar in all aspects to the Dakota 12V 10AH, but with 7AH it has a 30% lower amp hour capacity, and also costs 30% less.

If your fishing trips only tend to be 2-5 hours on average, this battery provides plenty of power capacity for your purposes.

Our verdict: best budget lithium battery.

If you purchase the Dakota Lithium 12V 7AH battery, remember to use a lithium battery charger to recharge it. We recommend the BikeMaster Lithium Battery Charger.

 

4. ExpertPower EXP1270 12V 7AH Lead Acid Rechargeable SLA Battery

Photo of ExpertPower EXP1270 12V 7AH Lead Acid Rechargeable SLA Battery

The ExpertPower EXP1270 is a high quality 12-volt SLA battery. Traditionally used in home security systems, it has been successfully adapted for use as a battery for fish finder and to power  other marine electronics. 

The EXP1270’s covering is manufactured with hardened ABS plastic to safeguard it from damage and leaks. In addition, the ABS plastic coverings contain glass mat separators and lead plates, which further increase durability. Overall, this design makes it highly resistant to the regular punishment it’s likely to experience during kayak fishing, including exposure to saltwater.

In addition it also has a very fast charging time with 4 hours, which means you can still charge it on the day of your fishing trip, in case you forgot to do it the day before.

Our verdict: best SLA battery.

Since this is an SLA battery, remember to charge it with an SLA battery charger. We recommend using the Peleus Tech 12V portable lead acid battery charger.

 

5. Chrome Battery SLA 12V 7AH Lead Acid Battery

Photo of Chrome Battery SLA 12V 7AH Lead Acid Battery

This is a very popular lead acid battery that is used for a variety of applications, ranging from residential alarm systems to mobile scooters, and which also works great for powering fish finders.

The Chrome Battery 12V 7AH is a premium quality SLA battery  made with lead calcium alloy, and includes both T1 terminals and AGM technology. The result is a totally maintenance-free battery that’s easy to use and performs at a high level. 

The battery case is made with welding technology, which protects the lead acid battery from heat, shock, and other common punishments. Its fiberglass mat separators further enhance durability. Combined, these features protect the battery from a long list of environmental hazards and other abuse, making it one of the most durable SLA batteries on the market.

Finally, the Chrome Battery 12V 7AH SLA battery is also maintenance-free, meaning you won’t have to worry about water refilling. 

Our verdict: most durable SLA battery.

Since this is an SLA battery, remember to charge it with an SLA battery charger. We recommend using the Peleus Tech 12V portable lead acid battery charger.

 

6. Mighty Max YTX20-BS 12V 18AH 270 CCA SLA Power Sport Battery

Photo of Mighty Max YTX20-BS 12V 18AH 270 CCA SLA Power Sport Battery

The Mighty Max YTX20-BS battery utilizes a highly durable, cutting-edge calcium-alloy grid, which gives you outstanding service life and performance. Highly resistant AGM technology further helps to protect the battery from shock or leakage concerns. The battery is portable, maintenance-free, and easy to use.

This is another popular SLA battery that can be used for all sorts of applications. It is fish finder-mountable and with a high amp hour count of 18AH should remain powered for the length of your fishing expedition. It doesn’t require any refilling or maintenance.

However, be mindful that some users report that the performance of this battery tends to deteriorate rapidly with use, and it requires regular cleaning out of the connecting cables after use, as well as by immediately recharging the unit after each use, to avoid poor performance on the next trip.

Our verdict: least reliable SLA battery

Since this is an SLA battery, remember to charge it with an SLA battery charger. We recommend using the Peleus Tech 12V portable lead acid battery charger.

 

7. Power Sonic 12V 7AH 570 Portable Fish Finder Battery

Photo of Power Sonic 12V 7AH 570 Portable Fish Finder Battery

The Power Sonic PS-1270 F1 battery features AGM technology to enhance its functionality. The 12-volt 7AH battery can be safely used in all sorts of applications, and it is widely used for kayak fish finders. It has optimal compatibility and portability courtesy of the regulated valve. Best of all, the battery is built to be spill-proof.

This is a solid battery, and  because it’s totally maintenance-free, it is a popular fish finder battery for many kayak anglers. The Power-Sonic battery includes a warranty (one year).

Our verdict: solid & reliable SLA battery

Since this is an SLA battery, remember to charge it with an SLA battery charger. We recommend using the Peleus Tech 12V portable lead acid battery charger.

 

8. Universal Power Group UPG 85980/D5722 Sealed Lead Acid Battery – 12V 35 AH

Photo of Universal Power Group UPG 85980:D5722 Sealed Lead Acid Battery - 12V 35 AH

With 35AH the UPG 85980/D5722 battery packs enough power to run a kayak motor, which is exactly what it is most commonly used for. In addition, many anglers also use it to power their fish finder at the same time, and this is the SLA battery that we recommend if you are planning to use both a kayak motor and a fish finder on the same fishing trip.

In spite of its power, this SLA battery is both versatile and portable, and delivers continuous and optimal service thanks to its spill-proof and valve-regulated construction. And while it’s not a full sized deep cycle battery, it does a very reliable job at powering all the electronics on a small boat or kayak, and the charge can last for several fishing trips.

Absorbent Glass Material (AGM) design helps it to resist a wide variety of shocks and physical damage without leaking, and no maintenance or re-filling is required for this sealed battery. It is capable of handling all kayak electrical systems without issues on a single charge, you’ll have the ability to maintain power for the length of your kayak fishing trip.

Our verdict: best SLA battery to power both kayak motor and fish finder

Since this is an SLA battery, remember to charge it with an SLA battery charger. We recommend using the Peleus Tech 12V portable lead acid battery charger.

 

What battery to use for fish finder

Since fish finders use electricity to produce sonar pulses, they are 100% dependent on having an active battery to charge them (for more details check out our article on how does a fish finder work?).

Because of this, you need to make sure your fish finder battery doesn’t run out during your trips. There’s nothing more annoying than a battery running low in the middle of your weekend trip, or during a fishing tournament.

Lithium vs. sealed lead acid: which battery type is best for fish finders?

Traditionally, most anglers have used sealed lead acid (SLA) batteries to power their fish finders. But recently, lithium batteries are rapidly gaining popularity as a preferred alternative.

Even though lithium batteries are more expensive, they offer significantly better performance across the board,  and thus higher value for money. On average, their charge lasts more than twice as long as that of SLA batteries, and their lifetime expectancy is 5 – 15 times longer than that of SLA batteries.

In order to avoid your battery running low, it’s best to purchase the best quality battery for fish finder that you can afford. In most cases, this will be a lithium battery, since the lifetime per charge is more than twice as long as for an SLA battery.

The main reason to choose an SLA battery instead of a lithium battery, is if you are on a tight budget, as they are more affordable than lithium batteries.

You may also want to get two batteries to run all your electrical gear, especially for night fishing, or you can keep the second battery for backup. That way you won’t have to cut your fishing trip short if one battery runs low.

2 types of kayak fish finder battery:

There are currently 2 main battery types available for kayak fishing: 

  • Sealed lead acid fish finder battery

Lead acid batteries (SLAs) are best known for their use as car batteries, and are traditionally the most commonly used kayak battery type. Their main advantage is that they are inexpensive and come in a range of sizes, so you can choose the one that fits best in your kayak, while powering all your electrical needs. 

On the minus side, their weight is on the heavy side, and the lifetime of a full charge is often barely enough to get you through one day of fishing. However, based on their budget friendly price, they are still a popular choice for many anglers. 

  • Lithium fish finder battery

This battery type is best known for its use in laptop batteries, and is rapidly gaining popularity with kayak anglers. It has three key advantages compared to SLAs: lithium batteries are significantly lighter, a full charge on a lithium battery lasts more than twice as long as a full charge on an SLA battery, and it can be recharged for 2000-7000 recharging cycles on average, while SLAs only last for 400 charging cycles on average. In practice, this means you can use a lithium battery for several fishing trips before you have to recharge it. 

On the minus side, lithium batteries are more expensive than SLAs. But for those who have extra money to spend, and want to get the best quality possible, a lithium kayak fish finder battery is definitely the best choice.

Best fish finder battery for ice fishing

If you’re planning to use your battery for ice fishing, you should be aware that subzero temperatures drain a battery faster than warm weather. Because of this, the best battery for ice fishing is a lithium battery, since its charge lasts much longer, and we recommend the Expert Power Lithium 12V 10AH for this purpose.

This battery is perfect for regular fish finders adapted for ice fishing (which you can read more about in our article on can a fish finder work through ice?), or for powering an ice fishing flasher. For more details on flashers, take a look at our review on the best flashers for ice fishing.

Best amp hour capacity for kayak batteries

Let’s go over the voltage (v) and ampere (amp) capacity that you’ll require. Refrain from buying a battery for your fish finder that has a too high voltage, since doing so could damage the fish finder. Most fish finders use between 12 and 24 volts, and a 12 volt battery is plenty for most kayak fish finders.

Ampere capacity is given in amp hours (AH). You can calculate the amp capacity you need by checking how many amps your fish finder uses per hour. From there, multiply your amps by the operating time desired, and use this to choose the amp hours (ah) you need in your kayak fish finder battery. For example, if your fish finder uses 1 amp per hour, a battery with 10ah capacity should be able to run it for 10 hours. 

Keep in mind that less power is drained by smaller fish finder models, while bigger models that include GPS capability may drain more. Many kayak fish finders are very compact, using less than 1 amp per hour, and so should drain the kayak battery more slowly. 

Kayak fishing trips tend to last anywhere between 3 and 12 hours, which covers quite a wide range of amp hours. So, in order to get the best battery for your specific needs, you need to decide how long you plan to be on the water on average. 

If you’ll be spending the whole day on the water, choose a battery with 10 to 16 ah capacity. If you are planning to spend just a few hours fishing at a time, a battery with a 5 to 10 ah capacity is fine. In general, it’s best to get more capacity than you expect to use, just to make sure you never  run low on power.

Choose the right charger for your fish finder battery

It’s essential to charge your fish finder battery correctly. Ensure that the charger you use is compatible with your battery since using an incorrect charger may damage your battery, rendering it unusable. 

A lithium battery requires a different charger than an SLA battery. If you try to use an SLA charger on a Lithium battery, it won’t be able to fully charge the battery, plus you run the risk of breaking down the LiFePo4 electrolyte, which will shorten the battery’s lifespan.

So make sure you use a lithium battery charger for a LiFePO4 battery and an SLA charger for an SLA battery. Many manufacturers give specific recommendations on which charger to use for their batteries.

How to store the battery on your kayak

Since kayak fishing does tend to involve quite a lot of water splashed over the sides, it’s important to store the battery in a protected compartment that can be firmly sealed, which should ideally be watertight. That way, water will not affect the well-protected battery, enhancing both its performance and its longevity.

 

Final remarks

If you want to get the most out of your kayak fishing trip , it is essential to choose the right battery for your fish finder. The last thing you want is to run out of juice in the middle of your fishing day.

In order to get the perfect fish finder battery, first choose the fish finder model you want to use, and then decide how long your kayak fishing trips will last on average. Based on that information, calculate the amp hours you’ll need, and buy the right battery to cover your specfic needs.

If you’re thinking about buying a new fish finder, take a look at our reviews on the best fish finders under $200, and the best fish finders under $300. Or, if you want to check out the features on more high end models, take a loot at our Garmin Striker 7SV review, as well as our Lowrance Elite 9 TI review.

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