Thread: Battery question

It would help to know what trolling motor you are using.

Originally Posted by dwightparks

Currently running an minn kota ulterra with 4 group 27 interstate batteries. I do a lot of trolling. Two batteries would not last but about six hours. The four batteries fixed my problem . Just installed a new ultrex on the boat. My batteries are six years old and will be replacing them shortly. Was thinking about trying to go with two group 31 interstate . I know lithium is what a lot of people are using but I don't care for the prices they charge. Anyone trolling with 2 batteries (old style) and have enough juice to run 8-10 hours especially on windy conditions with an ulterra. I know I can go right back to the four group 27 batteries like I have now for 600 bucks cost. Trying to save some space and weight in my boat. I have been told the onboard charger I'm using will not work for lithium. It is an older model guest charger

I’m using two Duracell 31 AGM on a 80# Terrova. I can go 8-10 hours at 1.7-2.1 mph no problem.
I had Intersate before and they didn’t last but a year. Academy wouldn’t warranty them, I had to ship them back to interstate.

I got the Duracells from Batteries Plus. Been on my boat for four years now. No problem.


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We run a 80# Ulterra on 2 Duracell AGM 31 batteries bought from Sam's. In addition, we have 2 Duracell group 27 AGMs, one for starting, boat lights and accessories and the other a deep cycle for Electronics. We go from Light till after dark. Mostly trolling. Never ran out of juice. The 27 running electronics died just after a year, and the local Sam's replaced it with a new one. They each have their own chargers and are plugged in when we get back and kept on until we go again.

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Lithium batteries while expensive, seem to be the way to go these days. I sell lead acid batteries made here in the US. They are going up in price with every order I place with my supplier. Most marine batteries only have a 12month warranty, and some less that that. 4 lead acid group 31's batteries are going to run you nearly 200.00 each. That's 800.00, with only a 12mo warranty. May get 4 to 5 years out of them tops. The initial outlay for lithium will be high however you won't be replacing them every 4 or 5 years. Just my thoughts. I have one lithium for my starting and electronics battery. When I need to replace my lead acid batteries for my 24v Ulterra it will be with lithium even though I can buy lead acid at cost.

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