RYOBI ONE+ 18V Lithium-Ion HIGH Performance Starter Kit with 2.0 Ah Battery, 4.0 Ah Battery, 6.0 Ah Battery, Charger, and Bag

4.0 Ah Battery: Up to 4X more runtime, 2.0 Ah Battery: Up to 2X more runtime, INTELLICELL Battery Technology features advanced electronics allowing batteries to last longer, think smarter and deliver up to 30% more power, Advanced lithium-ion cells maximize performance and runtime during demanding applications, High visibility LED fuel gauge clearly indicates remaining runtime, Easily snaps into place and detaches with quick-release buttons