These RYOBI ONE+ 18V Lithium-ion HIGH PERFORMANCE 4Ah batteries provide up to 4X more runtime, 30% more power, and runs cooler compared to our standard lithium-ion batteries to provide long-lasting reliability and better performance. These HIGH PERFORMANCE 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 HIGH PERFORMANCE 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. Backed by the RYOBI 3-Year Manufacturer's Warranty, these batteries include an operator's manual. Charger sold separately.