I was given an old electric lawnmower with a dead battery that was 'charged'. The check revealed that the charger itself was defective so I needed a charger but I didn't know if the battery would fit so I didn't want to spend a lot of money on a new charger. This caught my attention and I tried it out. It worked great, and a few months later, just out of curiosity, I tried running this mower (which is only kept as a backup). She fired right away! I can also use it for my motorcycle battery if it ever needs charging.