I bought a new battery for my cordless vacuum because the old battery was starting to give out. I could have bought a cheaper version but decided to purchase the original since it means better savings in the long run. Why buy a fake when the original is available? The website itself is reputable and comes with a troubleshooting page that is easy to follow. There is also a customer's service option if you need assistance. Honestly, I would buy from Dyson's website since it gives you peace of mind knowing that you're getting your money's worth.