RYOBI introduces the 18V ONE+ Lithium-Ion 4.0 Ah Compact Battery (2-Pack) and Charger Kit with FREE ONE+ 4.0 Ah HIGH PERFORMANCE Battery. This RYOBI 18V ONE+ Lithium-Ion 4.0 Ah Battery (2-Pack) and Charger Kit provides up to 3X more runtime compared to standard 18V lithium-ion batteries. These batteries are compatible with over 300 18V ONE+ products to power through all types of projects. Built with professional grade lithium-ion cells these batteries provide fade free, cord-like power. They are engineered to perform in extreme weather temperatures and are engineered to be impact resistant. They also feature an integrated LED fuel gauge for charge monitoring. The included charger is compatible with all RYOBI 18V ONE+ Lithium-Ion Batteries. This HIGH PERFORMANCE battery also features the most advanced on-board battery electronics that monitor voltage, temperature, and current to extend the life of the battery. Best of all, it’s a part of the RYOBI ONE+ System of over 300 Cordless Products that all work on the same battery. Backed by the RYOBI 3-Year Manufacturer’s Warranty, this kit includes two 18V ONE+ 4.0 Ah Lithium-Ion Batteries, an 18V Charger, a FREE 18V ONE+ Lithium-Ion HIGH PERFORMANCE 4.0 Ah Battery, and operator's manual.