Charge the battery immediately after each use.By using the equation above, an estimate can be made to determine the battery that will best fit your needs.įor more information about batteries, please visit our Calculating Trolling Motor Run Time page. On the flip side, two hours at lower speeds with breaks will only require a battery between 50-100 AH rating. Using a Newport Vessels 55lb thrust motor continuously for two hours at full speed would require a battery with a 100-120 AH rating. More information can be found on our Calculating Trolling Motor Run Time page.Ĭhoosing the correct battery amperage hour rating depends entirely on the intended use. (50 AH battery / 52 amps drawn = 0.96 hours). If a trolling motor pulls 52 amps at full speed while connected to a 50 AH battery, the battery will last about 0.96 hours. Simple math will be able to determine how long a motor will run with a given battery. For example, an 80 AH battery will be able to discharge 100 amp hours of current to a trolling motor and will last longer than a 50 AH battery. The longer you want to run your trolling motor, the more amp hours you need.Ī more technical definition is the amount of charge in a battery that will allow one ampere of current to flow for one hour and how much energy can be stored by the battery itself. This increase in surface area is enough to hold electrolytes on the cells for their lifetime, making the battery lighter, spill proof, and less susceptible to vibration damage.Īmp Hour Rating determines how long you will be able to run the motor, it is the actual amount of charge the battery can store. Unlike Wet-Cell units, the electrolytes are held in glass mats instead of fluid, these glass mats are made up of very thin glass fibers that are woven into a mat to maximize the surface area. AGM batteries are sealed and therefore do not require maintenance with a reliable life as long as 4 years, they come at a higher price than equivalent Wet-Cell units.ĪGM stands for Absorbed Glass Mat and are also referred to as a Valve-Regulated Lead-Acid Battery (VRLA) or Sealed Lead-Acid (SLA) battery. Recommendation: Check the electrolyte level before each use, top off as necessary.ĪGM Batteries: AGM batteries are newer than their Wet-Cell counterparts, they are completely sealed, maintain their charge longer, and have a longer usable lifespan. If the electrolyte level drops enough to expose the cells and plates, the battery can be damaged and shorten the usable life of the battery. If the battery is overcharged too frequently, the water level will drop, to maintain proper water level, occasional top offs with distilled water are necessary. Wet-Cell refers to the cells/plates in the battery being “flooded” or submerged in an electrolyte fluid, a mix of water and sulfuric acid. They usually cost less than $100 but are susceptible to vibrations and spillage, additionally they do require some maintenance. Lead Acid Wet-Cell: Lead Acid Wet-Cell batteries are the most common and affordable option for trolling motors, and usually last about 2-3 years. There are two types of deep-cycle 12-volt batteries that are recommended for electric trolling motor use: Lead Acid Wet-Cell & AGM batteries. Regularly using a starter battery with a trolling motor can ruin both the battery and even the motor. With this type of use, starter batteries will not last very long. Starter batteries are not designed to constantly have their charge dropped below 50%, only to be recharged over and over. On the other hand, starter batteries are designed to discharge a large current for a short amount of time (ex. Deep-cycle batteries are designed for discharging small amounts of current over a long period of time (ex. Most consumers are familiar with large and heavy car batteries, but there are actually two types of batteries that fit this description: starter batteries and deep cycle batteries. We often recommend this 35ah battery, this 55ah battery, this 70ah battery, or this 100ah battery on Amazon.
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