These chargers are amazing. These will easily repair sulfated lead batteries, they will instantly Jumpstart a car or truck and will fully charge a car battery in about 10 minutes. I wish these had a few more options to them. These were ment for people who are electrically and mechanically inclined and know how to safely use them. These are also great to use with a 5000 watt generator to charge offgrid battery system or RV batteries when you are away from a power source.