The SoundLink Mini requires a power input of: 5 VDC, 1.6 A. Any charger rated this or higher will be sufficient for charging. If you wish to purchase an official Bose charger, please visit this link, then head to the contact page to phone your local aftersales team.
I hope this helps!
Feel more. Do more. Be more. Come check out my profile here. New to the community? Check out the Getting Started board. Help others find answers to your questions by clicking on 'Accept as Solution' at the bottom of a reply. If you see a post you like, make sure to give it a thumbs up!