The RYOBI 18V ONE+ Lithium HIGH PERFORMANCE Starter Kit with FREE 18V ONE+ HP Compact Brushless Compact 6-1/2" Circular Saw. is the perfect way to expand your 18V system and increase your productivity. Add (2) 4Ah and 2Ah Lithium HIGH PERFORMANCE batteries and charger to your collection when you purchase this starter kit. This 4Ah battery features up to 4X more runtime and the 2Ah features up to 2X more runtime than the previous model 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 applications. These batteries feature a high visibility LED fuel gauge to clearly indicate remaining runtime. Easily install and remove the battery with secure quick-release latches. Part of the RYOBI ONE+ System - Any 18V ONE+ Battery Works With Any 18V ONE+ Product. This 18V ONE+ Lithium HIGH PERFORMANCE Kit is backed by the RYOBI 3-Year Manufacturer's Warranty and includes (2) PBP004 18V ONE+ 4Ah Lithium HIGH PERFORMANCE Batteries, PBP003 18V ONE+ 2Ah Lithium HIGH PERFORMANCE Battery, PCG002 18V ONE+ Charger, 18V ONE+ HP Compact Brushless Compact 6-1/2" Circular Saw.