Flick the key blade out, then look on the back of the key for a small slot. Put a flat bladed screwdriver in the slot and lift the plastic gently while pulling the top part of the key with the blade in it away from the bottom bit with the buttons. It should need very little force.
Once apart, split the 2 halves of the button section with finger pressure, and batteries exposed 
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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