In this video you will see how to replace / change key battery (key fob) on Opel Corsa C, Astra G, Agila, Combo, Meriva in 4 simple and easy steps.
– a flat blade screwdriver
1. Place the screwdriver in the hole and press downwards and slide it back
2. Split the key part in half
3. Remove the old battery using the screwdriver and replace it with new one
4. Install all the parts from the key.
See also these VIDEO TUTORIALS for Opel: