The DEWALT® POWERSTACK™ 20V MAX* Compact Battery is 50% more powerful, 25% more compact, and 15% lighter*. This battery features an impact-resistant, rubber overmold 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. This kit includes (2) DCBP034 DEWALT® POWERSTACK™ 20V MAX* Compact Batteries. (NOTE: This YY version is due to packaging changes)