What about alarm and stuff like that, radio etc.
Just asking questions that the OP hadn't ask, thats all.Nothing happens with the alarm old timer.
And the radio code is in the front cover of your service record book. (the red one if the car was built after 2004, Blue if it was built before)
This is all assuming we're talking about a CLio.
Mine are 10mm. Infact, both of mine are 10.
(I'm going back to work in a sec, i'll prove it....)
What are you stuck with dude?
you'll need a 10mm spanner, a Ratchet, a 13mm socket and an extension bar.
Disconnect the negative terminal first (marked with a - ) and then the positive using the 1mm spanner.
Then use the 13mm and the extension on the socket to undo the clamp deep down the side of the battery.
Remove and refit.