BEST and SAFE : How to change Audi remote key battery - A3 A4 A6 A8 TT Q6 Q7 Quattro

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Quick video on popping open my Audi key fob and replacing the battery. This specific one was for an A3 but the fob is the same for a whole range of their models including A4, A6, A8, TT, Q6, Q7, and Quattro

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Battery @
Screw driver @