This is an amazing little charger that literally breathes new life into your failing DeWalt batteries. It revitalizes everything from 9.6 volts through the big 18-volters but what's so great about this charger is that not only can it be used as a standard quick charger but if you leave a worn-down battery in for four to 10 hours the charger conditions the battery with a tune-up mode and at completion it automatically converts to trickle charge so you'll never damage a battery by leaving it in the charger too long. Diagnostics with LED indicators give you the battery status at a glance: charged charging power line problem replace pack and battery too hot or too cold. It's got a small footprint which is always a plus and the price is look-twice-and-rub-your-eyes cheap.[]