Are Lithium Batteries Good for Trolling Motors? Pros & Cons

Choosing the right battery for trolling motor is just as important as picking the right motor itself. In recent years, lithium batteries, especially lithium iron phosphate (LiFePO4) types, have gained popularity among anglers and boaters for their performance, weight savings, and long lifespan. But are they truly worth it for trolling motors, or is the hype overrated?

Let’s dive into the pros and cons of lithium trolling motor batteries, and help you decide if lithium is the right choice for your fishing adventures.

Trolling Motor Batteries Types

Flooded Lead-Acid (FLA) Batteries

The most traditional choice, FLA batteries are relatively inexpensive and widely available. They require regular maintenance, such as checking water levels and cleaning terminals, to prevent corrosion. While they can work well for occasional anglers, they are heavy, have a shorter lifespan than other battery types, and lose power as they discharge.

Absorbed Glass Mat (AGM) Batteries

AGM batteries are sealed, maintenance-free, and more durable than traditional flooded batteries. They handle vibration well, making them suitable for rough water conditions. However, they are still heavier than lithium batteries and generally last 3–5 years with proper care.

Gel Batteries

Gel batteries use a thickened electrolyte, making them highly resistant to vibration and extreme temperatures. They have a longer lifespan than standard flooded lead-acid batteries but are more expensive. Charging must be carefully controlled to avoid damage, so they require compatible chargers.

Lithium (LiFePO4) Batteries

Lithium batteries are the newest and most advanced option for trolling motors. They are significantly lighter, offer longer run times, and maintain full power output until nearly empty. High-quality lithium batteries can last 8–10 years or more, with thousands of charge cycles.

Lithium Batteries for Trolling Motors: Pros & Cons

The Pros of Lithium Batteries for Trolling Motors

1. Lightweight and Easy to Handle

One of the most obvious benefits is the weight. Lithium batteries are up to 70% lighter than traditional lead-acid batteries. If you’ve ever had to haul a heavy battery from your garage to your boat, you’ll appreciate the difference. Less weight also means better boat performance, especially for kayaks and small fish boats.

2. Longer Run Time

Lithium batteries maintain a steady voltage output throughout their discharge cycle. This means your trolling motor will run at consistent speed and power until the battery is nearly empty, unlike lead-acid batteries that gradually weaken. For anglers, that translates into more time on the water and fewer frustrating slowdowns.

3. Faster Charging

Lithium batteries can recharge 2-3 times faster than lead-acid batteries, allowing you to get back on the water quickly. This is especially helpful for multi-day trips where charging time is limited.

4. Longer Lifespan

High-quality lithium batteries like Redodo’s can last 4,000 cycles at 100%DOD, compared to 300–500 cycles for lead-acid batteries. With proper maintenance, lithium batteries can last up to 10 years, while the lead-acid options only last 2-3 years.

5. Higher Energy Density

Lithium batteries store more energy than lead-acid in the same size, allowing you to power your trolling motor longer without increasing weight or size. This means more hours of consistent performance in the same battery footprint.

6. Maintenance-Free

Unlike FLA batteries that require regular water level checks and corrosion prevention, lithium batteries are virtually maintenance-free. Just keep them clean, charged, and stored properly, and they’ll serve you for years.

The Cons of Lithium Batteries for Trolling Motors

1. Higher Upfront Cost

There’s no denying that lithium batteries cost more initially. However, when you factor in the longer lifespan and reduced need for replacements, they can actually be more cost-effective over time.

2. Temperature Sensitivity

Lithium batteries shouldn’t be charged below 0°C (32°F), as charging in freezing weather can damage the cells. If you plan to use lithium batteries during winter, opt for models with low-temperature protection or a self-heating feature.

Redodo 12V 100Ah Self-heating Lithium Battery

3. Compatibility Concerns

Some older trolling motors or onboard chargers may not be optimized for lithium charging profiles. Lithium trolling motor batteries usually require a dedicated lithium battery charger. Using a standard charger may shorten the battery’s lifespan and impact its proper operation.

Read More: Can I Charge LiFePO4 Battery with a Normal Charger?

How Much Does It Cost to Replace a Lithium Trolling Motor Battery?

The cost of lithium trolling motor batteries has been a common concern for anglers considering an upgrade from lead-acid or AGM batteries. Fortunately, the price trend of lithium batteries has dropped significantly in recent years, making them far more accessible than before.

While lithium batteries still have a higher upfront cost than standard flooded lead-acid batteries, the price gap has narrowed considerably due to advancements in lithium technology and increased production. Today, we can see that some 12V 100Ah lithium batteries are priced in the $200–$300 range, which is close to the cost of some 12V 100Ah AGM batteries.

The real value of lithium batteries comes from their longer lifespan and superior performance. High-quality lithium batteries can last 3–5 times longer than AGM batteries. Over time, this means fewer replacements and lower long-term costs.

Cost Comparisons of Trolling Motor Batteries (12V 100Ah)

Are Lithium Trolling Motor Batteries Worth It?

Yes. If you fish frequently, need longer run times, and value consistent performance, lithium trolling motor batteries are definitely worth the investment. While the upfront price is higher than lead-acid options, they last much longer, require no maintenance, charge faster, and are far lighter. Over their lifespan, they can actually be more cost-effective than replacing lead-acid batteries every few years.

Are Lithium Trolling Motor Batteries Safe to Use?

Most lithium batteries are very safe when used as intended. They have a built-in Battery Management System (BMS) that protects against overcharging, over-discharging, overcurrent, short circuits, and overheating. Choosing a reputable brand with safety certifications ensures reliable and secure operation. Avoid low-quality batteries without proper protections, as they may pose safety risks.

Redodo LiFePO4 batteries are industry-leading and offer exceptional safety performance. They are built with premium EV-grade LiFePO4 cells and come with an advanced BMS with 20+ protection in any fishing environment. Every Redodo battery is certified by UL-1973, CE, FCC, RoHS, and UN38.3, ensuring they meet strict global standards for safety.

How Long Will A Lithium Battery Run A Trolling Motor?

The runtime of a lithium trolling motor battery depends on the battery’s capacity (Ah), the motor’s thrust, and your speed setting. Higher-capacity batteries store more energy, motors with greater thrust draw more power, and running at full speed or against strong currents will reduce runtime.

For example, a 12V 100Ah lithium battery can last 5–8 hours of continuous use at medium speed on a 55–70 lbs thrust motor.

Related Reading: How Long Will a 100Ah Battery Run a 55lb Trolling Motor?

How Big of A Lithium Battery for A Trolling Motor?

Selecting the right lithium battery starts with matching the motor voltage. A 12V motor requires a 12V battery, while 24V and 36V motors can use multiple 12V batteries in series or a dedicated 24V or 36V battery. Choosing the correct voltage ensures safe operation and optimal motor performance.

Next, consider the capacity (Ah). For short trips of 2–3 hours, a 50Ah battery is usually sufficient. For longer, all-day fishing, 100Ah or higher is recommended. In tournament or heavy current conditions, anglers often opt for 120–150Ah to ensure maximum runtime. Oversizing slightly can prevent deep discharges, which helps extend battery lifespan and provides a buffer so you won’t run out of power mid-trip.

Here’s a general guide:

Redodo 24V Lithium Battery for Trolling Motor

Maintain Lithium Trolling Motor Batteries for Maximum Lifespan

Lithium batteries require minimal maintenance, but a few habits can keep them in peak condition:

• Use the right charger: Choose a charger designed for LiFePO4 batteries, with the correct voltage profile. Avoid lead-acid chargers unless they have a dedicated lithium mode.
• Avoid extreme temperatures: Store lithium batteries between 10℃ to 35℃ (50°F to 95°F) when not in use. Avoid charging batteries when the temperatures are below 0℃ (-4℉).
• Avoid full discharge frequently: Avoid running the battery until it’s completely dead. Stopping at around 20% state of charge helps extend its cycle life.
• Clean connections: Keep terminals clean and tight to ensure efficient power transfer. Protect exposed connections from moisture and salt spray.

By following these practices and using a quality lithium battery with a built-in BMS, you’ll maximize both the battery’s performance and longevity.

Conclusion

Are lithium batteries good for trolling motors? The answer is a confident yes. Lithium trolling motor batteries shine in situations where performance, weight savings, and long-life matter most, especially for anglers who value consistent performance, lighter weight, and long-term cost savings. Even for casual anglers, the investment can pay off in reduced battery replacements and better fishing experiences.

Explore Redodo’s best lithium trolling motor batteries and upgrade your fishing boat power today!