The RYOBI 40V 4Ah Lithium Battery features up to 2X more runtime than the previous model for an improved user experience. 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 demanding applications. The robust design and anti-vibration technology increases durability and enhances user experience. This battery features a high visibility LED fuel gauge to clearly indicate remaining runtime. Easily install and remove the battery with the secure quick-release button. Best of all, it is part of the RYOBI 40V system. This 40V 4Ah Lithium Battery is backed by the RYOBI 3-year manufacturer’s warranty and includes (1) OP4040A 40V 4Ah Lithium Battery and Operator's Manual. Charger sold separately.