This Ryobi 18V ONE+™ Lithium+ 1 x 4.0Ah Battery & 2.0A Charger Kit is perfect for DIYers who need longer runtimes. As part of the Ryobi 18V ONE+™ system, it offers compatibility with over 200 cordless tools. The innovative Lithium+ battery technology provides more power, longer runtimes, and better durability. It features IntelliCell™ technology, which monitors and balances individual cells to maximize run-times, storage life, and safety. This kit is ideal for DIYers and hobbyists looking to power their first Ryobi 18V ONE+™ tool or expand their existing system with increased runtimes.