The RYOBI 18V ONE+ System introduces lithium-ion performance at Ni-Cd prices. New and improved Lithium batteries are the very best value in lithium-ion performance. This new battery provides up to 20% more runtime, holds a charge 4X longer and is 45% lighter weight than 18V ONE+ Ni-Cd batteries at exactly the same price. Best of all, like all 18V ONE+ batteries, these new lithium-ion batteries work in every RYOBI 18V ONE+ tool ever made.