Cordless floorcare is fantastic, freeing you from the restrictions of the power cord, but that convenience can be cut short when a vacuum's battery dies mid-clean.
My two-storey home has four big bedrooms, and I wouldn't be able to clean the entire space if I didn't have two batteries. That's why vacuums such as the Dyson V11 Outsize at Amazon get ahead of the problem by conveniently coming with two batteries included, so that large homes can be cleaned in one swift session.
