The OEM Craftsman CMCB204-CK 20V MAX 4.0 Ah Lithium-Ion Battery & Charger Kit is a high-quality power tool accessory designed for use in a variety of tools and equipment. With a 4 Ah lithium-ion battery capacity and 20V voltage, this red battery and charger kit ensures long-lasting performance and reliable power for your tools. Made by trusted brand Craftsman, this model is suitable for various power tool needs and is ideal for DIY enthusiasts and professional craftsmen alike.