The Einhell 18Â V 4.0 Ah Power X-Change PLUS Twin-Pack is part of the inter-compatible Power X-Change battery system from Einhell. The universal Power X-Change batteries provide power and endurance to any cordless tool across the entire product family. Latest-generation lithium-ion cells achieve 100Â % more power for maximum performance in all applications, and in a more compact design with lower weight. The PLUS technology also means extra power for intensive jobs. The 18Â V 4.0 Ah Power X-Change PLUS is also suitable for use as a twin-pack in 36Â V applications. Two 4.0Â Ah Power X-Change PLUS batteries are supplied. The charger is sold separately.