There are many options for electric trolling motor batteries, and choosing the right battery size is crucial to ensuring optimal performance and efficiency on the water, so how do you know which one to choose? Here, we will introduce you to the most commonly used 12v li-ion battery, and explain to you why we recommend using 12v by comparing the advantages and disadvantages of various types of batteries, how battery size affects the performance of the boat, li-ion battery lifespan, etc. li ion battery so that you can buy wisely.

The types of trolling motor batteries

The battery is one of the key components of the trolling motor system and is also the power source of the trolling motor. Different types of batteries can have a huge impact on your boating experience. There are three main types of trolling motor batteries: lead-acid, AGM, and lithium-ion (LiFePO4). Below, we discuss the advantages and disadvantages of each type in detail.

Lead acid wet battery

Lead-acid wet batteries are the most common type of battery used in trolling motors because they are affordable and versatile, but their manufacturing technology seems a bit outdated compared to other batteries today. Lead-acid wet batteries present certain safety hazards. When the battery is filled with water, the acid may escape. This can be hazardous to yourself, your vessel and the environment. Therefore their use is generally not recommended, especially for boats. In addition, the lifespan of lead-acid wet batteries is generally not comparable to AGM batteries and li-ion battery lifespan. If you decide to equip your trolling motor with a lead-acid wet battery, there are some precautions to consider before purchasing and installing the batteries.

AGM battery

Unlike traditional lead-acid batteries, AGM batteries use glass mats and a gel substance to promote the chemical reactions that store electricity.

This structure not only enhances the performance of the battery, but also eliminates the risk of leakage, allowing it to be used in various scenarios. In contrast, even a slightly loose battery cover in a lead-acid battery can cause leakage and create a safety hazard, which is why AGM batteries are trusted by consumers. However, one thing to consider is the weight of AGM batteries. It often puts a burden on the trolling motor, so if you have plans to buy an AGM battery, you need to consider whether it will take up too much of your space.

lithium battery

Lithium batteries have the advantages of AGM batteries, are lightweight, and have excellent ability to provide power quickly. For kayak fishing, just a 12v li-ion battery will meet your needs. Due to their small size and light weight, they have little impact on the performance of the kayak, so we highly recommend using lithium batteries. Although they tend to be more expensive, li-ion battery lifespan can reduce your cost of ownership worries when purchasing a 12v li-ion battery for your trolling motor, in addition to the need to charge it with a compatible charger to avoid damaging the battery. Besides, you don’t need to spend extra money on maintenance, so they are considered the best choice for most kayak setups.


What size battery is suitable for trolling motor?

Choosing the right size battery for your boat is critical for optimal performance and safety. The size of the battery directly affects the vessel's electrical system, engine performance, fuel consumption and overall stability. Oversizing or undersizing a battery can adversely affect your boat's performance and battery life. Using a larger battery will provide more power and longer run time to your trolling motor. However, larger batteries are heavier and bulkier, which affects the performance and maneuverability of the boat. In comparison, smaller batteries are lighter and easier to handle, but may not provide enough power for extended use. Therefore, we recommend that you purchase a 12v li ion battery according to your needs. By connecting the batteries in series or parallel, you can meet the specified power supply requirements of the device and reduce unnecessary weight while meeting the power supply conditions.