The Twin-Pack 18V 2.5Ah 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. A single rechargeable battery and a single charger for all tools not only saves significant costs but 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. With 2 x 2.5Ah batteries as TWIN-PACK the working time will be prolonged and the batteries can provide more power for demanding applications. The ABS process-controlled active battery management system has a microprocessor for permanently monitoring the battery parameters. It therefore ensures maximum safety optimum tool perform