I have just found this non Parrot manufactured battery on Amazon. It is more expensive than Parrot's for some reason and is still 2700mAh.
ele ELEOPTION 2700mAh 7.6V Replacement RC Battery Compatible for Parrot Anafi : Amazon.co.uk: Toys & Games
ele ELEOPTION 2700mAh 7.6V Replacement RC Battery Compatible for Parrot Anafi : Amazon.co.uk: Toys & Games
www.amazon.co.uk