The Hyper Tough 20VMax 1-Hour Fast Dual Charger is for when you have a lot of work to get done and/or have a lot of tools to charge. You might think this is a luxury item, but if your time is valuable to you, it isn?t. Most chargers fill-up 1 battery at a time in about 5 hours. With the Fast Dual Charger you can fill-up 2 in an hour-and-a-half, or one in an hour. Do you have 5 to 10 hours to waste on a job if you?ve forgotten to charge a battery ahead of time? Get the Fast Charger and get the work done, fast.