Using the DeWalt DCB104 charger is easy. First, make sure the charger is plugged into a proper power source. Then, insert your 12-volt or 20-volt MAX batteries into the ports. All four ports can charge at the same time, so you can charge multiple batteries quickly. It takes about 40 minutes to charge a 4.0Ah 20V MAX battery and 60 minutes for a 6.0Ah 20-volt MAX battery. For storage, use the cord wraps to keep the cord tidy. You can also mount the charger on the wall using the thru-hole wall mounts or on the ToughSystem rails with the side brackets. When not in use, unplug the charger from the power source. Keep the charger in a dry and cool place. If the charger gets dirty, you can use a dry cloth to clean it. Don't use any harsh chemicals or liquids to clean it. Also, make sure to use only DeWalt batteries that are compatible with this charger.