A:Answer Hello Bob, this is Kelly with Dyson. While we can't guarantee a lifespan for the battery due to varying factors, I can confirm that we would generally expect the battery to outlast the free 2-year guarantee provided with all new machines purchased from an authorized retailer. While we don't expect problems to occur, the guarantee is in place to help protect against any problems that may ever arise or come up with a new purchase. I'm also happy to share that we do also have many happy cordless Dyson owners who are still enjoying some of our earlier models today. If needed, the battery can be replaced.
Best wishes,
Kelly
Dyson Customer Support