The DEWALT POWERSTACK 20V MAX Compact Battery is 50% more powerful, 25% more compact, and 15% lighter. This battery features an impact-resistant, rubber over mold base and utilizes revolutionary pouch cell battery technology to provide twice the lifetime. Engineered to get into tight spaces without sacrificing performance, our most powerful, most compact, and lightest weight battery is compatible with the 20V MAX tools and chargers you already own.