If you have a rechargeable 'anything', then you are going to have to replace the batteries at some point, or throw it away.
I do love all things Dyson, and like Apple fans, I am happy to pay a little more for a device that is well engineered and offers those little extras to do the job right. However, I'm not prepared to pay over the odds for a battery that at the end of the day is just a consumable.
That's whey I bought this replacement battery off Amazon and fitted it myself within minutes.
A more powerful, longer lasting battery for a lot less than Dyson wanted for a replacement, Winner!!!!