A good cordless vacuum is a helpful addition to any household cleaning arsenal. The best models offer a balance of performance and runtime. They should be powerful enough to clean bare floors, stairs, shelves, furniture, and carpets in your home on a single charge. Cordless vacuums are also great for cleaning your car's interior, no extension cord required. They should have enough accessories and tools to tackle any of these jobs. And you'll want to look for a model with a good filter to avoid blowing dust around while you clean.