A replacement Gtech SW10 battery for the Ni Cd (nickel-cadmium) powered model. The 4.8V Ni Cd Gtech SW10 battery that powers your unit is very powerful, providing you with up to 45 minutes of sweeping time around your home. However, with many years of hard usage, clearing your home of dust & debris, it can start to lose its charge. By purchasing this replacement battery, you can ensure that your Gtech SW10 can be fully-charged & ready to perform effectively in your home.