How fast is HART’s 20V Fast Charger? Pretty fast. It can charge all your 1.5Ah and 2.0Ah HART 20V Lithium-ion Batteries in under 1 hour. The charger easily attaches to the battery. Just plug in the charger snap in the battery and the light will blink green when charging begins. It also has an LED indicator light that shows the status as the battery is being charged. When charging is complete the light will be solid green. It’s also lightweight (just 1.6 lbs.) and convenient to store with a wall mount design built-in. Other features include advanced charging action for battery protection and an extended life. Includes Fast Charger and operator’s manual. Batteries sold separately and is backed by HART’s limited 3-year warranty.