How do you change battery on central locking key?

This is for Renault Megane II .With the key card buttons facing toward you, pull the right hand bottom corner of the key card to the right-There is a groove in the card this is the "Emergency Key!" Pull it out .The battery will be half visible replace with same type "Maxell CR2025". Now you know where the emergency key is too! Only Opens passenger door.Clip on door is pulled and key can be inserted.

Eric (South Africa)