Power X-Change 2x 18V 4Ah Power Tool Batteries Twin Set - 

The 2x 18V 4Ah Power X-Change batteries are members of the multifunctional and completely interchangeable Power X-Change rechargeable battery system from Einhell. The Power X-Change rechargeable batteries can be used universally for supplying power and endurance to every cordless tool from the entire garden and workshop product family. The advantages to the customer are obvious: A single rechargeable battery and a single charger for all tools not only saves significant costs of buying, universal use helps protect the environment and provides flexibility in the home and garden too. It also eliminates the untidiness and chaos of having different rechargeable batteries and chargers for each separate tool. The 18V 4Ah PXC is a basic rechargeable battery from the Power X-Change family and is also suitable for TWIN-PACK use for 36V applications. With two 4Ah batteries as TWIN-PACK the working time will be prolonged and the batteries can provide more power (2x 18V = 36V) for power demanding applications. The ABS process-controlled active battery management system has a microprocessor for permanently monitoring the battery parameters.