This twin pack contains two 4.0Ah rechargeable batteries from the Einhell Power X-Change family, offering the flexibility to use them in 18V tools or combine them for 36V applications. The high-quality li-ion cells provide no memory effect, low self-discharge, and consistent high power delivery for optimal tool performance and extended battery life. Each battery features an LED display for charge status and a robust, rubber-coated housing for protection against impact, dust, and corrosion. The included trough handle allows for easy removal from tools. These batteries are compatible with all Einhell 18V Power X-Change tools and suitable for TWIN-PACK use with Einhell 36V cordless tools. The ABS process-controlled active battery management system, with its integrated microprocessor, constantly monitors battery parameters to ensure maximum safety, optimal tool performance, extended operating time, and maximum service life.