While you wait for answers, we may have found some information which could help you.
Click here for Plug 12v DcBraun Shaver AC/DC Power plug broken, can I use a normal 12V adapter?
How to replace Braun Trimmer in Series 7 790cc?
how can I fix Braun 5614 long hair trimmer?
Replacement battery for Braun 5502 shaver?
How to change the battery in my Braun Shaver?
Braun 5550 Shaver Battery?