The RYOBI® 18V ONE+™ Upgrade Kit is a great choice whether you currently use Ni-Cd or lithium-ion batteries to power your ONE+ tools. It is the perfect way to upgrade battery performance and have keep a spare battery charged and ready to go. The charger works with all 18V ONE+ batteries, and the battery works with all 18V ONE+ tools, blue and green tools alike. The compact lithium-ion battery gives up to 20% more runtime, weighs 45% less and holds a charge 4X longer than a Ni-Cd battery. Lithium-ion batteries provide Fade-Free power, which stays constant until the charge is depleted and does not fade away like the power of a Ni-Cd battery. The compact design is ideal for use in tight areas and overhead applications. The charger features patented IntelliPort™ Technology, which protects battery cells, maximizes battery life, and is ENERGY STAR® rated. It is designed to store the batteries on the charger to condition them for peak performance. It charges the included battery in 30 minutes.