What's the Best Type & Size Battery for Trolling Motor
Choosing the right battery size for your trolling motor is essential to ensure optimal performance and efficiency on the water. In this comprehensive guide, we will cover all you need to know about choosing the right battery size to meet your boating requirements.
Table of Content
- Part 1: Understanding Trolling Motor Batteries
- 1.1 Types of trolling motor batteries
- 1.2 Factors to consider when choosing a trolling motor battery
- Part 2: Choosing Deep Cycle Battery for Trolling Motor
- Part 3: What is Marine Battery Group Size (GCI Group Size)?
- Part 4: Battery Maintenance and Care Tips
- Part 5: Choosing The Right LiFePO4 Battery for Your Trolling Motor
Part 1:Understanding Trolling Motor Batteries
1.1 Types of Trolling Motor Batteries
Choosing the right battery for your trolling motor can feel overwhelming with so many options. Here are the three most common types: Flooded Lead-Acid, AGM (Absorbed Glass-Mat), and Lithium Iron Phosphate (LiFePO4).
Lead-Acid Wet Batteries
Flooded lead-acid batteries are the oldest and most common type. Inside, lead plates are submerged in a liquid acid (electrolyte). These are the least expensive option, often found in big-box stores for $100 or less.
They’re easy to maintain and last 2-3 years, but you can extend their life by topping up the acid with distilled water and using a charger to prevent sulfation.
Advantages of Lead Acid Wet Batteries:
- Affordable
- Widely available
- Easy to find replacement parts
- Can handle shallow discharges
Disadvantages:
- Require regular maintenance, such as filling with distilled water and cleaning terminals
- Shorter lifespan compared to other battery types
- Heavy and bulky
AGM Batteries
AGM batteries are a step up. They cost about twice as much as flooded lead-acid batteries of the same size. Unlike flooded batteries, AGM batteries are sealed, and the electrolyte is absorbed into mats that line the plates. This design makes them spill-proof and easier to transport.
AGMs are usually about the same weight or slightly heavier than flooded lead-acid batteries. They’re often called "maintenance-free" because you don’t need to check or adjust the acid levels. With proper care, they tend to last longer than flooded batteries since they are less prone to sulfation. However, AGM batteries may suffer more damage if drained completely.
Advantages:
- Longer lifespan compared to traditional lead-acid batteries
- Virtually maintenance-free
- More resistant to vibration and shock
- Can handle deep discharges
Disadvantages:
- More expensive than traditional lead-acid batteries
- Still heavy
Lithium Batteries
Lithium Iron Phosphate (LiFePO4) batteries are gaining popularity for trolling motors and other marine applications. These batteries are the most expensive of the three but offer significant advantages. As more manufacturers offer lithium options, the price continues to drop.
Lithium batteries are ideal for long-term use. They are lighter, last longer (up to 10 years with some warranties), and are more efficient. Though they cost more upfront, their long lifespan could make them a smart investment. Over time, they could save you money compared to frequently replacing flooded batteries.
For kayak fishing, using a lithium battery is highly recommended. They have minimal impact on the kayak's performance due to their small size and light weight. Although they tend to be more expensive, they are considered the best choice for most kayak setups. In fact, many top trolling motors for kayaks come equipped with lithium batteries.
Advantages:
- Longer lifespan in contrast to traditional lead-acid batteries.
- Lightweight and compact
- Maintenance-free
- Can handle deep discharges
Disadvantages:
- Expensive
- Requires specialized charging equipment
- May not be compatible with all trolling motors on the market
Each type of battery has its pros and cons, so choose the one that best fits your boating needs and budget.
1.2 Factors to consider when choosing a trolling motor battery
When selecting a trolling motor battery, there are crucial factors to consider beyond just the battery types. The battery capacity, measured in ampere-hours (Ah), is one such factor that determines how much energy the battery can store and supply to the motor. Higher capacity batteries offer longer run times but are heavier and more expensive.
Another critical factor is the voltage of the battery, which should match the power needs of the trolling motor. Typically, 12-volt or 24-volt batteries are used for trolling motors, depending on their power requirements. Using the wrong voltage battery can damage the motor or reduce its efficiency.
For trolling motors with up to 55 pounds of thrust, a single 12V battery is sufficient. More powerful motors up to 80 pounds of thrust require two 12V batteries wired in series to provide a total of 24 volts. The most potent trolling motors generating over 80 pounds of thrust usually require three 12V batteries wired in series to provide a total of 36 volts.
| Weight of Boat | RecommendedThrust Level(Minimum) | Battery Size Needed |
| ≤1500 | 30 lbs | 12V battery |
| 2000 | 40-45 lbs | |
| 2500 | 50-55 lbs | |
| 3000 -3500 | 70 lbs | 24V battery |
| 4000 | 80 lbs | |
| ≥4500 | 101-112 1bs | 36V battery |
It's worth noting that certain trolling motors are designed to work with specific battery types, so it's crucial to check the manufacturer's recommendations before purchasing a battery.
Maintaining your battery is also critical, regardless of its type. For lead-acid batteries, regular maintenance like fluid level checks and terminal cleaning is essential for optimal performance and longevity. AGM batteries require less maintenance but should be periodically checked for charging and storage conditions. Lithium-ion batteries require minimal maintenance but must be charged using a compatible charger to avoid damage.
Part 2: Choosing Deep Cycle Battery for Trolling Motor
When picking a battery for your trolling motor, it’s crucial to choose a deep cycle battery. These are clearly labeled. A deep cycle battery is built to release small amounts of energy over a long period.
In contrast, cranking batteries are designed for short bursts of high power, like starting a car engine. They are also used in boats, mainly to start outboard engines and power accessories.
Most Lithium Iron Phosphate (LiFePO4) batteries are deep cycle.
2.1 Can I Use a Dual-Purpose Marine Battery for My Trolling Motor?
You might also find dual-purpose batteries. These are a mix of cranking and deep cycle power. They work for both long-term accessory use and engine starts.
So, yes, a dual-purpose battery can power your trolling motor. However, if you’re using a 24V or 36V trolling motor system, avoid using a single battery for both cranking and deep cycle duties. It can cause uneven current draw and may damage the battery over time.
Choosing the right battery ensures longer life and better performance for your boat.
Suggest reading: Marine Deep Cycle VS Starting Batteries
Part 3: What is Marine Battery Group Size (GCI Group Size)?
When shopping for trolling motor batteries, you'll come across various ways to identify them. One common method is called group size. The most common sizes you'll see in marine applications are group 24, 27, and 31.
At first, this size naming might seem confusing, but it simply refers to the battery's physical dimensions—length, width, and height—not its amperage or voltage. Understanding the group size is crucial for fitting the battery properly in marine or automotive spaces. It follows an industry standard. Below are the approximate dimensions for each group size in inches:
For smaller boats with lighter loads and less powerful motors, a group 24 battery may be sufficient. Group 24 batteries typically have dimensions of around 10 x 6.88 x 9.94 inches and a capacity of around 70-85 Ah. However, LiTime group 24 LiFePO4 battery has the capacity of 100Ah.
For larger boats with heavier loads and more powerful motors, a group 27 or 31 battery may be necessary. Group 27 batteries typically have dimensions of around 12 x 6.75 x 8.88 inches and a capacity of around 90-105 Ah. Group 31 batteries are even larger, with dimensions of around 13 x 6.81 x 9.44 inches and a capacity of around 100-125 Ah. Below is the format of other BCI battery size.
Advantages and disadvantages of using larger or smaller batteries
Using a larger battery will provide more power and longer run times for the trolling motor. However, larger batteries are heavier and bulkier, which can affect the boat's performance and maneuverability. LiTime has 36V trolling motor battery, which is suitable for up to 120lbs trolling motor.
In contrast, smaller batteries are lighter and easier to handle but may not provide enough power for extended use. Therefore, it's essential to strike a balance between the battery size and the boat's weight, thrust, and fishing conditions to ensure optimal performance.
Therefore, it is crucial to find a battery that strikes the right balance between size and performance based on factors such as boat weight, thrust, and fishing conditions. The solution lies in upgrading to a LiFePO4 battery, which offers high energy density and lighter weight.
Is a 12v 20ah lithium good for a troling motor?
A 12V 20Ah lithium battery can be used for a trolling motor, but there are some considerations
1. The Runtime
A 12V 20Ah battery offers a total capacity of 240 watt-hours (Wh) (calculated as 12V * 20Ah). The runtime of the battery depends on the power draw of the trolling motor. For example:
- If your trolling motor draws 20 amps, this battery would last roughly 1 hour (20Ah / 20A = 1 hour).
- If your trolling motor draws 10 amps, it would last approximately 2 hours.
2. Power Requirements
Many trolling motors require more than 20Ah for extended use, especially at higher speeds. If you plan on using your trolling motor for long periods or at higher speeds, you may need a battery with a higher capacity (e.g., 50Ah or 100Ah) to ensure sufficient runtime.
A 12V 20Ah lithium battery is good for short trips or light-duty use with a trolling motor, but for longer outings or heavier use, a higher-capacity battery is recommended.
Part 4: Battery Maintenance and Care Tips
To ensure optimal performance, longevity, and safety of your electric trolling motor system, it is imperative to prioritize the maintenance and care of your trolling motor batteries. Below are some tips and guidelines to help you with this task:
3.1 Charging Techniques:
It is essential to use a charger that is specifically designed for your battery type to ensure optimal performance and avoid potential damage. Make sure the charger matches the voltage of your battery, if you are not sure, refer the table below. Avoid overcharging it as it may reduce its lifespan or cause damage. Charge the battery after every use and refrain from leaving it in a discharged state for an extended period. Can I charge LiFePO4 battery with a normal charger? Read on to find out!
3.2 Battery Storage Tips
Proper storage of your battery is crucial for its longevity and performance. Store the battery in a cool, dry place away from direct sunlight and extreme temperatures.
It is also recommended to disconnect the battery from the trolling motor before storage. If you're using a flooded lead-acid battery, maintain proper water levels. If storing the battery for an extended period, charge it fully before storage and recharge it periodically.
3.3 Signs of a Failing Battery
It is crucial to keep an eye out for signs of a failing battery to avoid safety hazards and ensure optimal performance. Signs may include difficulty starting the trolling motor, reduced power output, slow or incomplete charging, bulging or deformed battery case, and leaking or corrosion around the terminals. If you notice any of these signs, it may be time to replace your battery or seek professional assistance.
Part 5: Choosing The Right LiFePO4 Battery for Your Trolling Motor
| Voltage of Motor | Motor Thrust | Recommended Max Amp of Batteries | Recommended LiTime LiFePO4 Batteries | Recommended Reasons |
|---|---|---|---|---|
| 12V | 20 ~ 30 lb | 50A | LiTime 12V 50Ah Lithium Battery | Cost-effective |
| 12V | 30 ~ 70 lb | 100A | LiTime 12V 100Ah Lithium Battery | Cost-effective, Low-temp, Lighter |
| 24V | 70 ~ 100 lb | 100A | LiTime 24V 100Ah Lithium Battery | Cost-effective |
| 36V | 100 ~ 120 lb | 100A | LiTime 36V 55Ah Lithium Battery | One single battery is enough |
This table summarizes the recommended LiTime LiFePO4 lithium batteries based on the voltage of the motor, motor thrust, and the recommended maximum amperage of the batteries, along with the specific reasons for each recommendation. Visit LiTime Trolling Motor Batteries to select your ideal battery.
Conclusion
In conclusion, selecting the appropriate battery size for your trolling motor is crucial to ensure optimal performance and longevity. Using the wrong size can lead to reduced power output, shorter battery life, and potential safety hazards. Therefore, it's essential to consider factors like the motor's thrust, boat weight, and usage patterns to determine the right battery size.
As discussed earlier in this article, the best way to choose the correct battery size for your trolling motor is by referring to the manufacturer's recommendations or consulting with an expert. Additionally, be sure to maintain and care for your battery properly by following the charging, storage, and maintenance tips provided here.
By taking the time to choose the right battery size and caring for it correctly, you can enjoy a more efficient and reliable trolling motor system. So, don't overlook this critical aspect of your boating experience, and make the right battery choice today! Learn more about new-users benefis from LiTime.
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