A replacement battery charger for the Gtech SW05 fitted with a 4.8v Ni MH (nickel metal-hydride) battery. A damaged or lost Gtech SW05 charger could leave you unable to charge its battery & your unit out of action as a result. But don't panic. This replacement for your original 4.8v Ni MH SW05 charger will allow you to keep your SW05 charged & ready, for you to sweep your home spic & span.