Outdoors blog


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

You need a battery size of 240Ahrating for a 55lb trolling motor. You will be using 20-40 amps depending on speed. A 240 will last you about 6 hours at 20 amp load.

Obviously, if you love fishing then the same you will be doing with your boat, small vessels, or even let’s say kayak. So, to ensure your boat assists you the best at your fishing experience you will make sure that you select a perfect battery to attain a stable performance.

The key behind the stability of any motor is its battery choice that also includes it’s selection then maintenance and then charging it.

 Especially when you talk about a trolling motor then it requires or needs a deep cycle battery so that it can persist the high power demand continuously.

To get the better result make sure you have matched the discharge features of the battery and the consumption of your trolling motor. You must first know everything about your trolling motor so that you can determine which kind of battery it really needs. 

 So, here since we are talking about the trolling motors with a thrust of 55lbs. The first thing that we need to determine is the peak power drawn and in the case of this motor, it is 40amps. If you are using your motor for even at least 6hours at an average load of 20amps.

Then your trolling motor will be requiring a battery load of 120Ah


 Even one with 240Ahrating with a deep cycle must be first kept at 50% to make sure the battery runs for longer. But always stick to the fact the deeper will be the cycling of the battery, the less overall life you will get.  So in this condition, your normal battery bank should be rated with 20 amps with a 10-hour rate. 

You must not be aware of this fact but the way you use or the skill that you use to run your rolling motor determines a lot about the battery life of your battery. Because if you use the motor at average power levels of let say 30-40amps, then the battery capacity is generally cut off by 10-15%. So, make sure that you are using yours appropriately so that it can run for a longer time.


So, while making a choice of the most suitable battery for your trolling motor with a thrust of 55lbs then make sure you are trying to meet all the needs of your motor.

As you know the speed of the motor also derives the battery performance like if sharp heavy speed is chosen then it accordingly affects the battery life but if gradual speed is chosen then that might just give you less power and obviously good control as well. 

 Once you have opted for the most reliable battery for your trolling motor then the next thing required is the care and maintenance that obviously cannot be undetermined.


The basic problem in the battery starts with inappropriate charging this is because if you are only charging the battery occasionally and even not fully charging it then remember it will start to sulfate and you will lose the battery capacity. This will not only cost you with low battery performance but also that high service charge. 

 The sulfate composition so generated is the main reason to kill down your battery. This is why people generally prefer an on trailer vehicle-based charging system which does not have to face the problem of delayed charging.

Also, you must check the water levels, and either it is topped up with distilled one or not because even the electrolyte level falls in the summer season.

Also, stop referring to a cheap charger to auto-charge your battery because it can never even bring it up to the optimum condition. Do try to prefer a quality charger and rely on it. Also while making a charger choice make sure you are preferring one which can charge a 100Ah battery within 15-30amps. 

So, while buying a perfect battery for your trolling motor with 55lbs of thrust, you must first consider all the mentioned points and then make your choice and a one with 12 V is more than enough.

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