I had been trying to charge my lawn tractor which had sat outside all winter and wouldn't turn over. I had my old trusty charger going but it was about to rain so I decided to try this one. I plugged it in, switched to tractor and I got it going in record time so I could beat the rain. So easy to use and potent enough to get the job done quickly! I didn't even need to read the directions....its fool proof.