Hi there, has anyone come across this fault as its got us and our local Peugeot specialists stumped! Car is a 2001 307 1.6 petrol. If I put a new keyfob battery in each of the two keys, synch them to the car (although usually they operate the car locking straight away without the synch procedure), put the spare key away in the house and use one key in the car. Within generally 2-3 weeks the key in use battery goes flat. The key in the house still has a full battery over the same period. So then use the spare key in car, put new battery in first key and put in house.2-3 weeks later spare key battery flat, original key still full battery. Experimented and put a new battery in one key and left it in house now for the past 8 weeks and still full charge. Does anyone have any ideas or come across this before?