Nemorino, how much are you willing to spend? The fact that you're looking at E-bay I would assume is that you're on a really tight budget. Be honest with you I think 30 pounds is way more than you REALLY need. Are you going to be fishing or trolling around and wasting valuable fishing time? Are you fishing a giant lake? Dude, find a good spot and work it! You can do just fine with a much smaller trolling motor, battery, and most importantly FISHING SKILLS!!! I hope to hear from you soon. I am about to spend thousands of dollars on a boat. I can tell you that asking questions/researching everything involved has prevented me from making a bad decesion. I hope you will make the best decision and be content. Are the older trolling motors more battery efficient? I really feel that for the dollar go with the newer ones.