A replacement Ni Cd Gtech SW04 battery. Can also be used with the CSW02. Powered by a 4.8v Ni Cd (nickel-cadmium) battery, your Gtech SW04 can provide you with up to 60 minutes of sweeping time round the home. However, with many hours of hard use the Gtech SW04 battery can lose its run time. With this replacement Ni Cd Gtech SW04 battery you can continue to give your home the comprehensive Gtech sweeping treatment.