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I'm sure there's some calculations somewhere but I use a 50lb thrust motor with a bigger battery and I'm able to fish all day at Boerne Lake. I get in at 8am and leave at 9pm. Come home and still have 60% of the battery left. Granted I'm actually fishing and not just driving around all day. Stop for lunch, etc. When the battery starts going low you can feel it. The highest power seems to move you a little slower and you know it's time to start heading back towards the boat ramp.