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How Long Will a Battery Last in My Fish Finder?

27/02/2025

When organizing a fishing trip, it's vital to ensure that your fish finder has sufficient power for the entire duration. Fish finders are invaluable tools that utilize sonar technology to identify fish and underwater structures, significantly improving your fishing experience. To guarantee your fish finder operates efficiently throughout your outing, it’s important to know how long a battery can power your device.

In this blog post, we will examine the factors influencing battery life and provide guidance on estimating the runtime for your fish finder.

1. Understanding Battery Capacity

Battery capacity refers to the total amount of electricity produced through electrochemical reactions within the battery, typically measured in ampere-hours. This measurement indicates how long a battery can provide a specific current before being depleted.

For instance, a 12V 12 ampere-hours (Ah) battery can theoretically deliver 1 amp of current for 12 hours, or 2 amps for 6 hours, before it runs out of power. However, real-world performance can vary due to several factors, including temperature, discharge rates, and the age of the battery.

Consideration of Depth of Discharge (DOD)

Consider the depth of discharge (DoD) of a battery, which indicates the percentage of its capacity that has been utilized. For instance, if a battery has a total capacity of 100 ampere-hours and you draw 30 ampere-hours, the DoD is 30%. Most batteries have an optimal DoD to ensure longevity and performance.

Deep cycle batteries, commonly used in marine applications, lead acid deep cycle batteries are often rated for a 50% DoD.  

Lithium batteries, on the other hand, can handle a DoD of 80% or even 100% without negatively impacting their lifespan. Therefore, while a 100Ah lead-acid battery may effectively provide only 50Ah of usable power, a lithium battery can be fully utilized, offering the full 100Ah. This significant difference makes lithium fish finder batteries a more efficient choice for extended outings.

benefits of using lithium fish finder batteries over lead acid

2. Fish Finder Battery Voltage

Most fish finders operate on a DC power supply ranging from 12 to 24 volts. For instance, the Garmin ECHOMAP™ UHD2 7" sv Chartplotters has a power input requirement of 9 to 18 VDC, which means it can be powered using either a 12V or a 16V battery.

power input information of garmin fish finder

3. Fish Finder Battery Runtime Consumption

The power consumption of a fish finder is typically measured in watts (W) and can be found in the device’s specifications. To estimate how long a battery will power your fish finder, it’s essential to know the device's power consumption. One LiveScope plus fish finder system needs the power input range at 10-32 V. Power usage at 21W typical, 58W max. Let’s assume using it at typical using 21W.

power output information of LiveScope plus fish finder system

1. Using a 12V 12Ah LiFePO4 Lithium Battery

If you are using a 12V 12Ah lithium battery at its 100% DOD.

Power Consumption (in amps): To convert watts to amps, use the formula:
Amps = Watts / Volts
21W / 12V ≈ 1.75A

This means the fish finder draws approximately 1.75 amps from the battery.

Next, you can calculate how long your 12V battery will last while powering your fish finder. If you have a 12V 12Ah battery, the estimated runtime can be calculated using the formula:

Runtime (hours) = Battery Capacity (Ah) / Current Draw (A)
12Ah / 1.75A = 6.85h

However, if you are using the battery at 80% DOD, which means the capacity that is capable to use is 12Ah * 80% = 9.6Ah, now you can recalculate the runtime with the reduced capacity:

9.6Ah / 1.75A ≈ 5.49 hours

2. Using a 16V 30Ah Lithium Fish Finder Battery

When using a 16V 30Ah fish finder battery at 100% DOD, here's the caculation:

Power Consumption (in amps): 21W/16V= 1.3A
Runtime (hours)= 30Ah / 1.3A = 23 h

Bnefits of using 16V Fish Finder Batteries

  • Longer Runtime: With higher voltage, the amp drawing in the same watts is lower, so you can get longer runtime with 16V battery
  • Improved Clarity & Enhanced Signal: This technology not only boosts the clarity and brightness of electronic displays but also generates a stronger signal, allowing for better penetration and clearer returns from underwater. This advancement significantly enhances the accuracy of sonar images.

4. Factors Affecting Battery Life

While the previous calculations offer a theoretical estimate, various real-world factors can influence battery life:

  • Temperature: Extreme temperatures can impact battery efficiency. Cold weather, in particular, can significantly reduce runtime.
  • Battery Age and Condition: Over time, batteries naturally lose capacity. An older battery may not perform as effectively as a new one.
  • Usage Patterns: Continuous operation without breaks can drain the battery more quickly. Intermittent use is a better strategy for extending battery life.
  • Additional Load: If other devices, such as lights or GPS units, are connected to the same battery, they will consume extra power and diminish overall runtime.

5. Tips for Maximizing Battery Life

To get the most out of your fish finder battery, consider these helpful tips:

  • Maintain Your Battery: Regularly check and maintain your battery. Keep it clean and ensure it is properly charged.
  • Use Energy-Efficient Devices: Choose fish finders and other electronics designed for energy efficiency.
  • Carry a Spare Battery: For longer trips, having an extra battery on hand can be invaluable.
  • Monitor Battery Usage: Keep track of your battery's charge level and power consumption to avoid unexpected power loss.

By being mindful of these factors and tips, you can enhance the longevity and performance of your battery during fishing trips.

6. Average Lifespan of Fish Finder Battery

We have discussed the runtime of one fish finder battery while on the lake, now we are going to discuss the lifespan of the battery, specifically comparing lead-acid and lithium batteries.

6.1 Lead Acid vs. Lithium Batteries: Lifespan Comparison

The lifespan of a fish finder battery depends significantly on the type of battery you choose. While both lead-acid and lithium batteries can power your fish finder, they differ greatly in terms of longevity and performance.

Lead-Acid Batteries

Lead-acid batteries are the traditional choice for marine applications and have been around for decades. However, they come with certain limitations when it comes to lifespan:

  • Typical Lifespan: Lead-acid batteries generally last between 3 to 5 years, depending on usage and maintenance. However, they start to degrade significantly after around 300-500 charge cycles.
  • Depth of Discharge (DoD): Lead-acid batteries should not be discharged deeply, as this can severely shorten their lifespan. They are typically rated for a 50% DoD, meaning you only get about half of their total capacity before needing to recharge.
  • Maintenance: Lead-acid batteries require regular maintenance, such as topping up the electrolyte levels and ensuring that the terminals are clean and free of corrosion.

Lithium Batteries

Lithium batteries, on the other hand, have been gaining popularity in recent years due to their superior lifespan and performance. Here’s how they stack up:

  • Typical Lifespan: Lithium batteries can last anywhere from 5 to 10 years, with some reaching 4,000 to 15,000 charge cycles. This is significantly longer than lead-acid batteries, making them a more cost-effective option in the long run.
  • Depth of Discharge (DoD): Lithium batteries can be discharged much deeper than lead-acid batteries without negatively impacting their lifespan. Most lithium batteries can safely handle up to 80-100% DoD, meaning you can utilize almost the entire capacity of the battery before recharging.
  • Maintenance: Lithium batteries require minimal maintenance. There is no need to worry about topping up electrolytes or corrosion. Additionally, they often come with built-in Battery Management Systems (BMS) that protect the battery from overcharging, deep discharging, and other issues.

6.2 Why Choose Lithium for Your Fish Finder?

Considering the lifespan and advantages, lithium batteries are clearly the superior choice for powering fish finders:

  • Longer Lifespan: Lithium batteries last up to 3 times longer than lead-acid batteries, offering more value for your investment.
  • Higher Usable Capacity: With the ability to discharge up to 100% of their capacity, lithium batteries give you more power to run your fish finder for longer periods without recharging.
  • Lightweight: Lithium batteries are significantly lighter than lead-acid batteries, making them easier to transport and handle on your fishing trips.
  • Faster Charging: Lithium batteries charge faster than lead-acid batteries, allowing you to get back on the water more quickly.
  • Maintenance-Free: With no need for maintenance or worrying about electrolyte levels, lithium batteries provide a hassle-free experience for anglers.

6.3 Cost Comparison

While lithium batteries are more expensive upfront, they offer significant savings in the long run due to their longer lifespan and superior performance. Over the course of their life, a lithium battery will save you money on replacements and maintenance compared to lead-acid batteries, which require frequent replacements.

Ultimately, the decision comes down to your priorities: if you want a more cost-effective option in the short term, lead-acid batteries might be a suitable choice. However, if you’re looking for long-term value, performance, and ease of use, lithium batteries are the clear winner.

If you’re ready to upgrade to a more efficient, longer-lasting, and maintenance-free battery for your fish finder, explore our range of LiTime Lithium Fish Finder Batteries.

Whether you're a weekend angler or a seasoned pro, we offer a variety of sizes and capacities to meet your power needs.

Join LiTime

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