This combination brings together ONE+ 18V 4.0 Ah Battery (2-Pack) and ONE+ 18V 2.0 Ah Compact Battery (2-Pack) to create a complete solution. These RYOBI ONE+ 18V 4Ah batteries provide up to 4X more runtime, 30% more power, and runs cooler compared to our standard batteries to provide long-lasting reliability and better performance in over 300 ONE+ Products. These batteries also feature the most advanced on-board battery electronics that monitor voltage, temperature, and current to extend the life of the battery. When you pair these batteries with any ONE+ HP tool, advanced technology allows them to communicate to provide the best performance possible that powers through heavier applications and protects against overloading and overheating. They perform in extreme weather temperatures and are engineered to be impact resistant. These batteries features integrated LED fuel gauges to check your battery charge at all times. Best of all, they are a part of the RYOBI ONE+ System of over 300 Products that all work on the same battery platform. Backed by the RYOBI 3-Year Manufacturer's Warranty, these batteries include an operator's manual. Charger sold separately. Backed by the RYOBI 3-Year Manufacturer's Warranty, this kit includes ONE+ 18V 4.0 Ah Battery (2-Pack) and ONE+ 18V 2.0 Ah Compact Battery (2-Pack).