What Battery to Run a Fish Finder and Livewell All Day?

Whether you're fishing offshore for hours, or spending an entire weekend on the water, keeping your fish finder and livewell running reliably is essential.

The good news is that modern battery technology makes it easier than ever to power your fishing electronics all day even several days. In this guide, we'll discuss what size battery you need, compare different battery types, and recommend the best battery options for fishing electronics.

What Type of Battery Is Best for Fish Finders and Livewells?

Not all batteries perform equally when powering marine electronics. The three most common options are flooded lead-acid batteries, AGM batteries, and lithium batteries.

Lead-Acid Batteries

Traditional flooded lead-acid batteries have been used in boats for decades due to their low upfront cost. However, they are heavy, require maintenance, and typically offer only about 50% usable capacity. A 100Ah lead-acid battery effectively provides only around 50Ah of usable energy if you want to preserve battery life.

Additionally, voltage drops become more noticeable as the battery discharges, which can negatively affect sensitive fishing electronics like GPS, sonar, and livescopes.

AGM Batteries

AGM batteries improve upon traditional lead-acid technology by offering better vibration resistance and maintenance-free operation. They are popular among boat owners who want a more durable battery solution.

However, AGM batteries remain relatively heavy and still suffer from limited usable capacity (about 50%-60% of usable capacity). They also have a shorter cycle life compared to lithium batteries, making them more expensive over the long term.

Lithium Batteries

Compared to lead-acid and AGM batteries, lithium batteries provide nearly 100% usable capacity, significantly longer cycle life, faster charging speeds, and much lighter weight. A lithium battery can deliver stable voltage throughout the discharge cycle, helping fish finders and sonar systems operate more consistently.

For anglers seeking the best battery for fishing electronics, lithium batteries offer superior performance, reliability, and overall value. Although the initial investment is higher than lead-acid, the extended lifespan and increased usable energy often make lithium batteries the most economical option over time.

Redodo Lithium Marine Batteries

What Size Battery for a Fish Finder and Livewell?

The ideal battery size depends on how much power your electronics consume and how long you plan to stay on the water.

Generally, a typical fish finder draws between 1-3 amps per hour, and livewell pumps generally consume between 2-5 amps when running. The combined power draw between 3-8 amps per hour.

For example, a fish finder drawing 2 amps and a livewell pump averaging 3 amps will consume approximately 5 amps per hour. During a 10-hour fishing trip, the total energy usage would be around 50Ah.

To avoid fully draining the battery and to account for additional accessories, it's recommended to choose a 50Ah battery or 100Ah battery for fish finders and livewell.

Common Fish Finder & Livewell Runtime Chart

Taking mainstream 800 GPH (~3A draw) livewell pumps as an example, the following table shows the estimated runtime of common fish finder configurations under real-world usage conditions.

* As AGM and lead-acid batteries generally offer 50% usable capacity, a 12V 100Ah AGM or lead-acid battery capacity ≈ a 12V 50Ah lithium battery capacity.

For most fishing boats, a 12V 100Ah battery provides the perfect balance between runtime, weight, and cost.

A 100Ah lithium battery stores approximately 1,280Wh of energy, which is enough to power a fish finder, livewell pump, navigation lights, and other fishing electronics throughout a full day on the water. In many cases, anglers can even fish for multiple days before recharging.

Choosing a larger battery capacity also reduces battery stress, improves reliability, and provides peace of mind when fishing in remote areas. If you're searching for the best battery for fishing electronics, a high-quality 100Ah lithium battery is often the most practical choice.

Explore Redodo 12V 100Ah Lithium Batteries

Recommended Redodo Lithium Batteries for Fishing Electronics

Redodo offers several lithium battery options designed specifically for marine applications, fish finders, livewell systems, and other fishing electronics, from 50Ah to 120Ah battery models.

12V 50Ah Bluetooth Lithium Battery

For anglers looking to upgrade from a 12V 100Ah AGM battery to lithium, this 12V 50Ah Bluetooth Battery is a perfect choice. It delivers 640Wh of capacity and, in real-world use, provides longer runtime than a 100Ah lead-acid battery. It is also an affordable option, priced under $200.

Key Features:

• Built-in Bluetooth 5.0 monitoring
• Lightweight design at 11.27 lbs
• Ideal for trolling motors under 70 lbs

12V 100Ah Group 24 Bluetooth Lithium Battery

The Redodo 12V 100Ah Group 24 Bluetooth Battery is one of the most versatile choices for anglers. Its Group 24 footprint fits many existing battery trays, making upgrades simple and convenient.

Key Features:

• Group 24 compact size
• Weighs 65% less than lead-acid
• 1280Wh of high usable capacity

12V 100Ah Ultra-Mini Lithium Battery

For boats with limited storage space, the Redodo 12V 100Ah Ultra-Mini Lithium Battery delivers full-sized performance in a remarkably compact package.

Key Features:

• Ultra-compact Group 22NF size
• Weighs only 19.8 lbs
• Full 100Ah capacity & 1280Wh energy

Redodo 12V 100Ah Dual-Purpose Marine Battery

Many anglers prefer reducing the number of batteries on their boat. The Redodo 100Ah Group 27 Dual-Purpose Marine Battery is designed to serve both starting and deep-cycle applications.

Key Features:

• Smart Bluetooth & Auto-heating function
• 900 CCA high discharge capability
• 22.82 lbs, Group 27 standard size

Redodo 12V 120Ah Group 24 Bluetooth Battery

For tournament anglers and those running multiple units, the Redodo 12V 120Ah Group 24 Marine Battery offers additional energy reserves.

Key Features:

• Higher 120Ah capacity for extended operation
• Bluetooth smart monitoring
• 23.81 lbs, Group 24 compact size

FAQs about Fishing Electronics Batteries

How long will a 100Ah battery run a fish finder and livewell?

The answer depends on the total current draw of your equipment. If your fish finder and livewell consume approximately 5 amps combined, a 100Ah lithium battery could theoretically provide around 20 hours of runtime. In real-world conditions, this is often enough for multiple full fishing days.

Can I use the same battery for my fish finder and livewell?

Yes. Many anglers power both systems from a dedicated electronics battery. As long as the battery has sufficient capacity, a single lithium battery can reliably run both a fish finder and livewell throughout the day.

Is lithium worth the extra cost for fishing electronics?

For most anglers, the answer is yes. Lithium batteries offer more usable capacity, more stable output, longer lifespan, and reduced weight compared to lead-acid or AGM batteries.

What is the best battery for fishing electronics?

A high-quality LiFePO4 battery in the 100Ah range is generally considered the best battery for fishing electronics. It provides enough capacity for most fish finders, sonar systems, and livewell pumps while remaining lightweight (~20 lbs) and highly durable.

Conclusion

Choosing the right battery for fish finder and livewell can make a huge difference on the water. While traditional AGM or lead-acid batteries may seem sufficient on paper, their limited usable capacity often leads to shorter runtime and unpredictable performance.

In contrast, a LiFePO4 lithium battery is a far more reliable choice for powering fishing electronics all day long. For most anglers, a 12V 100Ah lithium battery remains the sweet spot, offering enough capacity to comfortably run both a fish finder and a livewell from morning to evening, and often even longer.

Read More:

What Size Fish Finder Battery Do I Need?

Choosing The Best Battery For Your Fish Finder

What Is the Best Marine Battery: Type, Size, and Buying Guide

What is the Best Battery for Livescope?