Powering your kayak fish finder requires a reliable battery that can withstand the unique demands of the marine environment. The right choice ensures your electronics stay on from your first cast until you return to shore, providing critical data on water depth, structure, and fish location. With options ranging from advanced lithium technology to trusted lead-acid designs, selecting the ideal power source is a crucial step in rigging your kayak for success.
This expert roundup for 2025 simplifies your search by highlighting eight top-performing batteries and a unique all-in-one mounting system. We’ve evaluated key factors like battery chemistry, capacity, cycle life, weight, and special features such as waterproofing to help you find the perfect match for your specific fish finder and fishing style. Our selections are designed to deliver dependable power, allowing you to focus on the fishing, not your battery life.
Our Recommended Kayak Fish Finder Batteries
- NERMAK 12V 10Ah Lithium LiFePO4 Deep Cycle Battery
- YakAttack CellBlok with Switchblade Transducer Arm
- OKMO 12V 15Ah LiFePO4 Lithium Battery 12.8V
- GOLDENMATE 12V 10Ah LiFePO4 Lithium Battery
- Mighty Max Battery 12V 8Ah SLA Battery
- UPG UB12350 (Group U1) Battery – 12V 35Ah – 2 Pack
- Dakota Lithium 12V 10Ah LiFePO4 Deep Cycle Battery
- ExpertPower 12V 7Ah Rechargeable Sealed Lead Acid Battery
NERMAK 12V 10Ah Lithium LiFePO4 Deep Cycle Battery
The NERMAK 12V 10Ah battery is a strong contender for anglers seeking a reliable lithium power source. Built with safe and stable lithium iron phosphate (LiFePO4) chemistry, it provides a high energy density and a remarkably long cycle life. Its built-in 10A Battery Management System (BMS) offers essential protection from overcharging, over-discharging, over-current, and short circuits, which is vital for use on the water.
With a rating of over 2000 cycles, this battery is designed to last for many fishing seasons, far outliving traditional lead-acid options. Its very low self-discharge rate means it will hold a charge for long periods between trips. This model is a versatile choice, suitable not only for your fish finder but also for other 12V applications like powering small electronics while camping or on your kayak.
YakAttack CellBlok with Switchblade Transducer Arm
This product is more than just a battery; it’s a complete, integrated mounting solution for your kayak. The YakAttack CellBlok system combines a track-mounted battery box with a platform and the popular SwitchBlade Transducer Arm. This all-in-one approach streamlines your entire fish finder setup, reducing clutter and saving valuable space on your kayak.
A key benefit is the no-drill installation, which preserves the integrity of your kayak’s hull. You can attach or remove the entire system quickly and securely by simply loosening two knobs. The updated CellBlok is lightweight and features a spacious interior designed to fit common 10Ah batteries, along with larger cable wraps to accommodate modern fish finder units.
OKMO 12V 15Ah LiFePO4 Lithium Battery 12.8V
For anglers who need extended runtime on the water, the OKMO 12V 15Ah battery offers a significant capacity boost. It provides all the advantages of LiFePO4 technology, including a high energy density and excellent stability, in a package that weighs just 3.5 pounds. This makes it a powerful yet lightweight alternative to heavier lead-acid batteries.
This battery is built for the long haul, with a specification of over 4000 cycles and a 10-year lifespan. It supports 100% Depth of Discharge, allowing you to use the full capacity without damaging the battery. The integrated 15A BMS provides comprehensive protection, and a notable Low-Temperature Charging Protection feature adds an extra layer of safety for anglers who fish in cooler climates.
GOLDENMATE 12V 10Ah LiFePO4 Lithium Battery
The GOLDENMATE battery stands out with its impressive durability and specific feature set for marine use. It boasts an exceptional cycle life of over 5000 cycles and a 10-year lifespan, making it a very cost-effective choice over time. The built-in BMS ensures safe operation by protecting against common electrical issues like overcurrent and short circuits.
A major advantage for kayak anglers is the IP67 waterproof rating, which provides excellent protection against splashes and brief immersion. Weighing only 3.3 pounds, it is easy to transport and install. This battery’s low self-discharge rate allows for storage for up to a year without needing a recharge, making it ready to go even after a long offseason.
Mighty Max Battery 12V 8Ah SLA Battery
This Mighty Max battery is a dependable and UL-certified sealed lead acid (SLA) option, specifically noted as a replacement for units like the Lowrance Elite-3x fish finder. As an SLA battery, it is spill-proof and maintenance-free, which are important characteristics for the bumpy and wet conditions of a kayak.
It offers a characteristic high discharge rate, wide operating temperature range, and a long service life typical of quality AGM batteries. This is a straightforward, no-fuss power source for anglers who prefer the proven technology of lead-acid batteries and have a fish finder with more modest power requirements.
UPG UB12350 (Group U1) Battery – 12V 35Ah – 2 Pack
This offering from UPG provides exceptional value and extended power for anglers with high demands or multiple devices. The package includes two 12V 35Ah batteries, giving you a substantial amount of power for long expeditions or for running a fish finder alongside other accessories like a livewell pump or navigation lights.
With this two-pack, you have the flexibility to wire the batteries in parallel to double your capacity for incredibly long runtime, or keep one as a fully charged backup. The Group U1 size is a common form factor, making it compatible with many aftermarket battery boxes and kayak storage compartments.
Dakota Lithium 12V 10Ah LiFePO4 Deep Cycle Battery
Dakota Lithium has built a strong reputation in the outdoor and marine communities for producing high-quality, reliable batteries. Their 12V 10Ah model utilizes LiFePO4 chemistry to deliver a lightweight and powerful source of energy for your kayak fish finder. These batteries are known for their robust construction and consistent performance in various conditions.
They typically feature a long cycle life and a built-in BMS for protection, aligning with the core benefits of lithium technology. For anglers who prioritize brand trust and proven performance from a company specializing in outdoor power solutions, the Dakota Lithium battery is a top-tier choice worth considering.
ExpertPower 12V 7Ah Rechargeable Sealed Lead Acid Battery
The ExpertPower 12V 7Ah battery is a classic and widely available sealed lead acid (SLA) option. It is a maintenance-free and spill-proof battery, making it a safe and simple choice for powering smaller fish finder units. Its compact size and common terminal design make it easy to install in a variety of battery boxes.
This type of battery provides a cost-effective solution for anglers on a budget or for those who do not require the extended runtime and lightweight properties of lithium batteries. It represents a reliable entry-point into powering your kayak electronics without complexity.
Buying Guide: How to Choose the Right Battery for Your Kayak Fish Finder
Choosing the right battery for your kayak fish finder is one of the most important decisions you’ll make for your setup. I’ve spent a lot of time on the water testing different power sources, and getting it wrong can mean a dead unit halfway through your trip. The goal is to find a balance between capacity, weight, size, and durability that fits your specific fishing style.
First, you need to understand battery capacity, which is measured in Amp-hours (Ah). This tells you how much charge a battery can hold. A simple rule I use is to check my fish finder’s specifications for its current draw in amps. If it draws 1 amp per hour, a 10Ah battery should, in theory, give you about 10 hours of runtime. I always add a 20-30% buffer to my calculations to account for real-world conditions and to ensure I never run out of power.
The next big decision is battery chemistry. For years, I used sealed lead-acid (SLA) batteries because they are inexpensive and reliable. However, they are heavy and can be damaged if discharged too deeply. My preference has completely shifted to Lithium Iron Phosphate (LiFePO4) batteries. They are significantly lighter, more compact, can be discharged almost completely without damage, and last for many more charge cycles. While the upfront cost is higher, the performance and longevity make them the best value for a serious kayak angler.
Physical size and weight are critical on a kayak. Every pound and every square inch of space matters. A bulky, heavy battery can affect your kayak’s stability and take up valuable storage. I look for a low-profile, lightweight design that can be easily secured in a hatch or a dedicated battery box. A waterproof or water-resistant casing is also a huge plus, as splashes and rain are inevitable.
Finally, consider the features. Built-in USB ports are incredibly convenient for charging a phone or other devices. A state-of-charge meter is a game-changer, letting you see exactly how much power you have left at a glance. For charging, a smart charger that properly maintains the battery is a must-have accessory to protect your investment. When you’re looking at the 8 best batteries for kayak fish finders, keep these factors in mind to find the perfect power solution for your adventures.
FAQ
How long will a 10Ah battery run my fish finder?
This depends entirely on your fish finder’s power consumption, which is usually listed in its manual in amps. For example, if your unit draws 1 amp per hour, a 10Ah battery should provide roughly 10 hours of use. If it draws 0.8 amps, you’d get around 12.5 hours. I always recommend testing your setup on land first to get a real-world idea of the runtime before you head out on the water.
Can I use a regular car battery for my kayak fish finder?
Technically, yes, but I would strongly advise against it. A car battery is far too heavy and bulky for a kayak, posing a serious safety risk to your stability and maneuverability. They are also not designed for the deep discharge cycles that a fish finder requires. Stick with a purpose-built marine or portable power station battery designed for this kind of application.
What is the advantage of a LiFePO4 battery over a lead-acid one?
The advantages are substantial. LiFePO4 batteries are much lighter and more compact for the same capacity. They can be discharged to almost zero without damaging the battery, whereas lead-acid batteries can be permanently harmed if discharged below 50% too often. LiFePO4 batteries also last for thousands of cycles compared to a few hundred for lead-acid, making them a better long-term investment for your kayak.
Do I need a special charger for my kayak fish finder battery?
Yes, using the correct charger is crucial for battery health and safety. Lithium batteries require a specific lithium-ion or LiFePO4 charger that manages the charging profile correctly. Using a charger meant for a lead-acid battery can damage a lithium battery and even create a fire hazard. Always use the charger recommended by the battery manufacturer.
How should I store my battery during the off-season?
Proper storage is key to a long battery life. I always make sure my battery is partially charged—usually around 50-80%—before storing it. Store it in a cool, dry place away from direct sunlight and extreme temperatures. For lead-acid batteries, you might need to give them a maintenance charge every few months, but most lithium batteries have a very low self-discharge rate and can sit for much longer.
Are the batteries in your list of 8 best batteries for kayak fish finders all waterproof?
Not all of them are fully waterproof, but the best ones for marine use have a high degree of water resistance. I always look for an IP rating; an IP67 rating, for example, means the battery can be submerged in water for a short time. At a minimum, your battery should be well-sealed and splash-proof to handle the wet environment of a kayak. Always check the manufacturer’s specifications for the exact level of water protection.