Power your entire RYOBI 18V ONE+ collection with longer runtime and enhanced performance using the RYOBI 18V ONE+ 4Ah & 2Ah Lithium HIGH PERFORMANCE Starter Kit. IntelliCell Electronics, a smarter power and runtime management system, maximizes performance to keep your tools performing at their best, even during demanding use. The COOL-CORE heat management system regulates pack temperature to keep it running cooler and maintain consistent output during use. A durable pack design with anti-vibration technology adds protection against impacts and everyday wear, whether you're on the job or working around the house. A high-visibility LED fuel gauge clearly displays remaining runtime so you can stay productive without interruptions. 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 allows you to recharge your batteries and quickly move on to the next project. Part of the RYOBI ONE+ system – any 18V ONE+ battery works with any 18V ONE+ product. This 18V ONE+ 4Ah & 2Ah Lithium HIGH PERFORMANCE Starter Kit is backed by the RYOBI 3-year manufacturer's warranty and includes (1) 18V 4Ah Lithium HIGH PERFORMANCE Battery, (1) 18V 2Ah Lithium HIGH PERFORMANCE Battery, Charger, and Operator's Manuals.