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 a spare battery charged and ready to go. The charger works with all 18V ONE+ batteries, and the battery works with all 18V ONE+ blue and green tools. The compact lithium-ion battery provides 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 and maximizes battery life. It is designed to store the batteries on the charger to condition them for peak performance. It charges the included battery in 30 minutes.