"RYOBI introduces the ONE+ 18V Lithium-Ion HIGH PERFORMANCE Kit w/ 4 Ah Battery, 6 Ah Battery, Charger, & FREE ONE+ Cordless Compact Router. The RYOBI 18V ONE+ 6Ah & 4Ah Lithium HIGH PERFORMANCE Starter Kit features up to 6X more runtime, increasing overall efficiency. INTELLICELL battery technology features advanced electronics allowing batteries to last longer, think smarter and deliver up to 30% more power. The COOL-CORE design reduces temperature to optimize battery performance and extend battery life. Advanced lithium cells maximize performance and runtime during demanding applications. The robust design and anti-vibration technology increases durability and enhances your overall experience. This battery features a high visibility LED fuel gauge to clearly indicate remaining runtime. Easily install and remove the battery with secure quick-release latches. Pair this Lithium HIGH PERFORMANCE battery with any 18V ONE+ HP tool to leverage high performance brushless motors and advanced electronics for more power, longer runtime and the overall best experience on the 18V ONE+ system. The included charger is compatible with all RYOBI 18V ONE+ batteries. Power all 300 ONE+ products with any RYOBI 18V ONE+ battery. This 18V ONE+ 6Ah & 4Ah Lithium HIGH PERFORMANCE Starter Kit is backed by the RYOBI 3-year manufacturer’s warranty and includes a 18V 8Ah Lithium HIGH PERFORMANCE Battery, 18V 4Ah Lithium HIGH PERFORMANCE Battery, Charger, and FREE Cordless Compact Router."