What Size Battery Is For A Trolling Motor

If you’ve ever been out on the water in a boat and needed to get your trolling motor going, you know how important it is to have a good battery. But with all of the different types of batteries available on the market, which one is right for you? Can you use a regular car battery for a trolling motor? In this post, we’ll take a look at what batteries are best for trolling motors, and we’ll also discuss some of the factors that you should consider when making your selection. So read on to learn more.

Trolling Motor Battery Chart

Battery Type Voltage (V) Amperage (A) Amp Hours (Ah) Weight (lbs)
Group 24 12 85 85 55
Group 27 12 105 105 63
Group 29 12 125 125 73
Group 31 12 145 145 82
Group 34M 12 170 170 94
Group 34H 12 210 210 118

What kind of battery do I need for a trolling motor?

A trolling motor is a small electric motor that you attach to the bow (front) of your kayak, canoe, or boat to help you maneuver and move the boat around. It’s especially useful for trolling, hence the name. Trolling is a technique used by anglers to attract fish by slowly moving their bait through the water.

A trolling motor also comes in handy when you need to reposition your boat in order to get closer to a spot where you’re fishing or when you want to avoid getting too close to rocks or other obstacles. Some people also use them as primary motors on small boats, but they’re not really powerful enough for that purpose.

In order for the trolling motor to perform as it should, it needs a battery that can supply the necessary power. If you use a battery that’s not designed for this purpose, it won’t last long and will cause problems with your motor. As such, it is important that you know the right battery for trolling motor.

There are two main types of batteries that are suitable and recommended battery for trolling motor: 12-volt deep cycle marine batteries or an AGM (Absorbent Glass Mat) type of motorcycle battery.

12-volt deep cycle marine batteries are specifically designed for use in boats and trolling motors. They have a higher capacity than regular car batteries, and they can handle being discharged and recharged multiple times without losing their ability to hold a charge. Marine batteries also come in different sizes, so you can choose one that’s the right fit for your boat.

AGM batteries are a good choice for trolling motors because they’re sealed and can’t leak, even if they’re damaged. They also have a high power-to-weight ratio, which means that they can provide a lot of power in a small package. AGM batteries come in both 12-volt and 24-volt sizes, so you can choose the one that’s right for your boat.

When choosing a battery for your trolling motor, there are a few things to keep in mind:

  • The size and weight of the battery: The battery should be small and lightweight enough to fit easily in your boat.
  • How many amps the battery will supply: The more amps, the greater the power of your motor.
  • How long it takes to recharge: If you’re going on a fishing trip that lasts several days or weeks, you’ll need a battery with plenty of capacity to last throughout your trip without having to stop and charge up again.
  • The number of times the battery can be discharged and recharged without losing its ability to hold a charge: A battery that can handle multiple discharges and recharges is ideal for a trolling motor.
  • The climate you’ll be using the battery in: If you’re fishing in a cold climate, you’ll need a battery that can handle lower temperatures without losing its ability to provide power.
  • The price of the battery: Batteries can range in price from around $50 to over $200, so you’ll need to decide what your budget is. Investing in a high-quality battery will pay off in the long run since it’ll last longer and need fewer replacements.

When choosing a battery for your trolling motor, it’s important to select one that is designed specifically for this purpose. Marine batteries or AGM batteries are good choices, and they come in different sizes, so you can find one that fits your boat. Be sure to consider the factors listed above when making your selection.

Can you use a car battery for a trolling motor?

You can use a car battery for a trolling motor. However, it’s not recommended to do so because car batteries are not designed for the high loads that trolling motors place on them. If you are using a car battery for a trolling motor, there are a few things you should keep in mind.

The first thing to consider is that a car battery is typically not designed for the kind of continuous power output required by a trolling motor. So if you plan to use a car battery for your trolling motor, you’ll need to make sure that it’s capable of handling the extra load.

Another thing to consider is that a car battery will eventually drain, regardless of how much power it’s putting out. So if you’re planning on using a car battery for your trolling motor, you’ll need to have some way of recharging it while you’re out on the water.

Finally, you’ll need to make sure that the cables are in good condition and that they’re properly connected to both the battery and the trolling motor. If there’s any chance of water getting into the connections, it’s important to take measures to prevent corrosion.

What size battery do I need for a 55 lb thrust trolling motor?

The ideal battery size for a 55lb thrust trolling motor should have at least a 240Ah rating. A battery with a higher Ah rating will provide a longer run time between charges, and it can last for about six hours.

However, if you are looking for a trolling motor battery that is more affordable and has a shorter run time, then you can go with a battery that has around a 120Ah rating. This type of battery will last for about three hours. But it is important to keep in mind that the lower Ah rating batteries tend to be less expensive.

What size battery do I need for a 40 lb thrust trolling motor?

The battery you need for a 40 lb thrust trolling motor depends on the voltage of the trolling motor. Most trolling motors run on 12 volts, so you’ll need a 12-volt battery. You may also need to consult the owner’s manual for your trolling motor to determine the amp-hour rating required. For example, a 120 amp-hour battery should be sufficient for a 40 lb thrust trolling motor.

What size battery do I need for a 30 lb thrust trolling motor?

When it comes to choosing a battery for a 30lb thrust trolling motor, you’ll want to go with a 12 V deep cycle marine battery. These trolling batteries are designed to withstand the rigors of marine use, making it an ideal choice for your trolling motor. Deep cycle batteries are also known for their ability to provide a steady flow of power, making them ideal for use with trolling motors. In terms of size, you’ll want to choose a battery with at least a 110 amp hour rating. This will ensure that your trolling motor has enough power to run at full throttle for extended periods of time. With the right battery, you can enjoy hours of trouble-free operation from your trolling motor.


The best batteries for trolling motors will depend on what you are looking for. We recommend that you do your research before making a purchase, as there are many different features to consider when deciding which is the right one for you. The battery is the heart of your trolling motor, and it’s important to get one that will give you the best performance to ensure you are able to enjoy your time on the water.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.