Expand your RYOBI 18V System with the RYOBI 18V 4.0 Ah Lithium HIGH PERFORMANCE Starter Kit. This 4.0 Ah battery features up to 4X more runtime than the previous model increasing overall efficiency. 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. With 2X faster charging that its previous model, this charger decreases downtime significantly. Featuring LED indicator lights, users can easily identify battery charge status. The Energy Save Mode conserves energy when not charging or maintaining batteries.Best of all, it is part of the RYO