One note. YOU control how long the batteries last. For example, on my Maxxum Pro (80# 24v) there is a chart on top that says if you run at 100% power, you will get about 2 hours of continuous running. Based on 56 amps per hour at wide open, that is probably generous as that will totally flatten a battery.I have seen days on Lay where it took 100% to barely move upstream when they are running 6 turbines and the wind is out of the north. Alternative is to start on the north end of your fishing zone and fish at 2-2.5mph drift speed going down-river. Pretty fast for me.So 2 hours is about the minimum battery life you can expect. As you dial back the thrust you dial back the amps needed and extend the running time. Ive fished all day with two good group 27 batteries and did not run out of power. But you do have to use judgement as to where you fish to avoid that 100% power requirement.