Enter the RYOBI 18V ONE+ System with the 18V ONE+ 4Ah Lithium-ion Battery. With up to 3X more runtime than the previous model, this lithium-ion battery provides an improved user experience. The new compact design is lighter weight and reduces overall user fatigue. This battery features a high visibility LED fuel gauge to clearly indicate remaining runtime. Fade-free power allows users to optimize the entire charge of the battery in all weather conditions. The robust design and anti-vibration technology increases durability and enhances user experience. Easily install and remove the battery with secure quick-release latches. This 18V ONE+ 4Ah Lithium-ion Battery is backed by the RYOBI 3-Year Manufacturer's Warranty and includes (1) PBP005 18V ONE+ 4Ah Lithium-ion Battery and Operator's Manual. Charger sold separately.