Selecting a Battery for your Trolling Motor
When it comes to selecting a trolling motor battery, there are 2 things you'll want to consider: battery type and battery amperage hour rating.
There are two specific types of 12-volt batteries recommended for use with trolling motors: Deep Cycle Batteries & AGM Batteries. Due to shipping restrictions, we currently do not sell marine batteries at TrollingMotors.net. However, both types listed below should be widely available in most areas.
Deep Cycle Batteries – These batteries are specifically designed for the frequent draining and re-charging associated with trolling motor use, and are the most affordable option. They will last between one and two and a half years, can be purchased for less than $100 and are a standard lead-acid wet cell battery.
AGM Batteries – The other option is AGM Batteries, which stands for Absorbed Glass Mat. AGM Batteries are built differently than standard lead-acid deep cycle batteries and generally last longer on a charge and have a longer life-span as a result. While a traditional deep cycle battery might last approximately two years, an AGM battery will usually last between three to four years. AGMs cost significantly more than standard deep cycle batteries – usually twice as much – and may not be an option for those on a tight budget. While more expensive, they are the best choice for longevity and performance out on the water.
Amperage Hour Rating
You can think of a battery's amperage hour rating as being similar to the gas tank of a car. Everything else equal, a battery with a 115 amp hour rating will last longer than a 100 amp hour rated battery. In more technical terms, a 100 amp hour rated battery can deliver 100 amp hours of current to a trolling motor. So if a motor was running at low speed and pulling 4 amps, the battery should last around 25 hours. (100 amp hour rating / 4 amps = 25 hours). Similarly, if the motor was running at top speed and pulling 40 amps, the battery would last for 2.5 hours (100 amp hour rating / 40 amps = 2.5 hours). For more information on understanding battery run times, please see our guide on understanding trolling motor run time.
For trolling motors use, we recommend a battery with AT LEAST a 100 amperage hour rating.