Are you asking how long you an run the trolling motor off the battery's or how long do they last? On our Bass boat they have lasted 4 years and longer, we have a 3 bank on board charger that's plugged in every time it comes out of the water. We can fish for 2 days off the 2 battery's, before they start running down in our boat. I have a 12v trolling motor and 1 battery for it on pontoon and it will let us fish for 2 full days too if it's not real windy. I charge it after weekend of fishing with a separate charger. Enjoy your new toy, have catch the big one!