The Hercules HC04 Lithium-ion Fast Battery Charger is a versatile and efficient power tool accessory designed for charging 12V and 20V batteries. With a sleek black design and model number HC04, this charger from Hercules is perfect for keeping your power tools powered up and ready to go. It can charge one battery at a time, making it convenient for users to quickly and easily rejuvenate their batteries whenever needed. With its multi-voltage capability and fast charging speed, the Hercules HC04 Lithium-ion Fast Battery Charger is a must-have for any workshop or job site.