A replacement Ni MH Gtech SW10 battery. Also compatible with the SW15. The rechargeable Ni MH (nickel metal hydride) battery that powers your Gtech SW10 is powerful & efficient, delivering up to 45 minutes of home sweeping time. But with lots of hard use around the home, the Gtech SW10 battery can start to lose its runtime. However, you can ensure your SW10 continues to perform at its very best with this replacement.