how do i remove a battery on a renault.

I've had a renault clio for a few month's and wanted to charge the battery,however it doesn't seem to have a normal nut and bolt type fitting on the terminals.
Each terminal has a flat cap type fitting,one green,one red,and the writing on the cap's is french.I don't want to try forcing the cap's in case i strip some thread's or something,how on earth do they come off.