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What Battery To Use For A Fish Finder (3 Best Fish Finder Batteries)

group of boats on the water

Fish Finder Batteries

So, you might have recently got your hands on a new fish finder for your kayak or other boat, and you’re probably looking for a power source that will keep it running all day long

There’s nothing more frustrating than having the gear to help you get into the fish, but not be able to use it because your power source is dead. The advantage folks with larger boats have is they can simply connect to the main cranking battery as their power source. Whereas us with smaller boats need a separate designated power supply.

So that’s why I’ve written reviews for each of my three favorite batteries to use with your fish finder. They’re the best power sources you can find for small boats, and they’ll last for years to come.

What Battery To Use For Fishfinders (Quick List)

Best Battery For Fish Finder (Reviews)

1. 12V 7AH PowerSonic Portable Fish Finder Battery 2-Pack

This PowerSonic battery is a step above other options that are available. It has a 12V power rating, and it can transmit 7 amps of energy consistently. That’s enough to power even the largest fish finders. So, you don’t have to worry about your fish finder being too much for it.

It also has a long battery life. Despite its small size, it can store about 12 hours worth of energy. Unless you take it on an extremely long fishing trip, you shouldn’t have to worry about it running out of juice. As an added bonus, it comes charged up.

One thing I like about the PowerSonic battery is its protective features. If you’re using one of these, you’re taking it on a small boat or kayak. There are a lot of things that can go wrong, and I like knowing that this battery has a spill-proof casing, and it’s sealed to prevent water from damaging it if you turn your kayak over.

Finally, you don’t just get one battery when you buy this package. It comes with a spare, and the spare has all of the same features as the first one.

That allows you to bring both batteries with your for extended trips, and you’ll always know that you have a backup if something goes wrong.


  • 2 batteries
  • 12V 7 amps
  • Spill-proof casing
  • Sealed against the elements
  • Long-lasting


  • It comes with two batteries. So, you always have a backup.
  • You won’t have to worry if your kayak flips. Your fish finder will still have a power source.
  • It’s incredibly easy to take care of. Dust and other foreign objects can’t ruin its internal parts.


  • There aren’t any real cons. If I had to come up with one, I’d say that I think the battery could be a little more compact for storage reasons.

Final Takeaway

This is the perfect 2-pack for anyone. It can handle large fish finders, and it’s perfect for medium and small fish finders. The inclusion of a second battery really makes it more valuable.

Check out this 2-pack fish finder battery pack on

2. Chrome Battery 12V 7AH Fish Finder Battery

This chrome battery isn’t very different from the PowerSonic that I chose to be my top pick. However, there are a couple of differences. The main difference is that you don’t get a second battery with the package. So, you’re stuck with one power source during your fishing trips.

However, it’s designed to work with a multitude of electronic devices. It has a 12V power rating, and it can transmit 7 amps per hour. It can work with anything from electronic scooters to fish finders. The connection system is extremely versatile.

That might not mean a lot to die-hard fishermen, but the average guys reading this might appreciate that. It’s a multipurpose tool, and it still performs admirably when it’s used to fuel a fish finder. There aren’t many options that offer that much flexibility.

Like my top pick, it also has a protective seal that prevents its battery acid from leaking, and it has corrosion-resistant connection points. That prevents it from being damaged if you put it through a lot of abuse, and it’s pretty much guaranteed to last a long time.


  • 12V of power
  • 7 amps per hour
  • Protective seal
  • Compatible with many electronic devices


  • Plenty of power for a variety of purposes. It won’t die during an average fishing trip.
  • It has a protective seal.
  • It’s easy to take care of.


  • It’s not nearly as compact as my top pick, and it only comes with one battery.

Final Takeaway

This is a great option for people who can’t afford the PowerSonic that I chose as my top pick. It has plenty of power to last throughout most fishing trips, and it’s protected against the elements.

Check Out The Chrome Battery 12V 7AH On

3. ExpertPower 12V 7 Amp Rechargeable Lead Acid Battery

This ExpertPower battery boasts a starting lifespan of 20-hours, but it’s known to cap out at about 10 or 12 after a few months of use. That’s still plenty of juice to last an entire fishing trip, and it has a few features that make it stand out from the rest of the batteries available.

The other batteries I reviewed have protective seals and systems that prevent them from spilling, but the ExpertPower has a heavy-duty shell that can protect it from fairly harsh impacts.

Like my other suggestions, the ExpertPower has a 12V power rating, and it delivers 7 amps per hour. However, it has an ABS shell that can withstand anything you can throw at it. It can handle being knocked into rocks after a bad kayak wreck, and it can easily survive falls if you’re a clumsier individual.

It also has a longer shelf life than other batteries. It’s not prone to dying while it’s in storage, and it comes fully charged when you buy it.


  • 12V
  • 7 amps per hour
  • Shock-resistant shell
  • Long shelf life


  • The long shelf life ensures that it won’t arrive with a limited lifespan.
  • The extra-tough shell is enough to protect against just about anything.
  • It’s more affordable than other options.


  • Its battery life dwindles as it’s used.

Final Takeaway

This is the best budget option available for kayaking enthusiasts. It’s cheap, tough, and long-lasting. It doesn’t quite meet my standards to be considered the best battery available, but it definitely deserves its place on this list.

Check Out The ExpertPower 12V 7 Amp Battery On

What To Look For In A Fish Finder Battery

Your fish finder’s battery is almost more important than your actual fish finder. Without a battery, you can’t access any of the crucial information that your fish finder provides for you.

The following three features are what I look for the most in a fish finder battery.

Battery Life

Battery life is easily the most important thing you should look at when you buy a new fish finder battery. After all, are you really going to fish for just an hour or two? My guess is that you want to spend your entire day on the water, and you need a battery that allows you to do that.

I suggest getting a battery that can last at least ten hours. That should cover any normal fishing trip you go on. However, a longer battery life will give you a little more peace of mind if you’re prone to forgetting to charge your batteries.


The majority of fish finders that you’ll find on bass boats can be powered via the boat’s motor. The batteries that I’ve suggested are meant for kayaks and other small boats with limited power.

Those small boats can easily get flipped over or smashed against rocks. If you have a battery with a weak frame, you’ll end up with a broken mess as soon as you hit something harder than your boat. If you plan on buying a battery, buy one that can take a hit. ABS shells are the best for this application.

Shelf Life

Shelf life is an important feature to look at. It won’t affect your use of the product too much, but it will affect how long you’ll have the product for after it arrives.

Batteries can end up sitting in a warehouse for a while, but the lithium-ion cores that they use can only last for about 5 years in most cases. If you can find a battery with a shelf life guarantee, I recommend buying it. Otherwise, buy one that’s guaranteed to be new when it comes from the factory.

There’s nothing worse than getting a brand new battery in the mail, and then finding out that it’s dead

Final Thoughts

I personally believe that the PowerSonic is the best deal you can get. It comes with two batteries, it’s powerful, and it has all of the features that I look for in a battery.

Check out the PowerSonic 2-pack fish finder battery pack on

However, the other two suggestions I made are equally valid options. They’ll power your fish finder for a long time, and they’ll take the abuse that occurs while you’re fishing from a kayak.

If you want the best battery for your fish finder, try one of the recommendations I outlined in this article, and thank you for reading.

Written by Don

When I'm not bass fishing or looking for steelhead in my home state of Oregon I can be found working on house projects dreaming of my next fishing adventure.

I started this website to share just some of the things I've learned along my fishing journey, and the many things I'm still learning. Enjoy!

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