Vw flip key battery replacement

What Model and Year is your vehicle? For a VW Golf (Mark IV 2000), Place the fob with the VW logo upwards. Prise apart the sleeve with the aid of a screwdriver along the join in the middle of the fob. One section has the key, the other has the transmitter. Gently prise open the transmitter top to access the battery which is in the lid. The battery can be easily removed, but note the orientation. A plus (+) sign is shown on the lid to indicate the way the new battery should be installed.