General description Einhell Power X-Change 18V Lithium Ion 4.0Ah Battery - Twin Pack is a versatile rechargeable battery system designed for multi-functionality. This advanced technology allows you to use 18V rechargeable batteries with varying capacity ratings to power any device within the Einhell Power X-Change range. Technical specifications Battery type: Lithium Ion Capacity: 4.0Ah Voltage: 18V Weight: Compact and lightweight compared to NiCd batteries Charging technology: Sophisticated charging technology for short charging times and maximum battery life LED battery control: 3-step LED battery control Other information Active Battery Management System (7-in-1 ABS) No memory effect: Can be recharged at any time, even if partially discharged No self-discharging: Always ready for immediate use after storage Consistently high performance: Delivers nearly the same power at the end of battery life as when freshly charged 3x running time compared to conventional NiCd batteries