I got a minkota at wallmart they sell for about a hundred bucks works really well better than rowing the lake I trout fish on has a 7and a half horse limit so it works well not a big lake any way id say on how long they last depends on a couple of things how big a battery ,how much you turn the speed up and how well you charged it before you went fishing <img src=icon_smile_big.gif border=0 align=middle>