Retail Packaged P102 Lithium Ion battery. The RYOBI 18V ONE+ System introduces lithium-ion performance at Ni-Cd prices. This new and improved 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, it works with Over 50 great ONE+ tools