The Ryobi ONE+ PBP004 18V Lithium-Ion 4.0 Ah Battery in Black is a high-quality power tool accessory designed for use in various tools and equipment. With a capacity of 4 Ah and a voltage of 18V, this battery provides reliable and long-lasting power for your tools, making it ideal for home and garden projects. Made in the United States by the trusted brand Ryobi, this lithium-ion battery is a durable and efficient choice for your power tool needs.