How do you change a battery in a citroen C5?

To change the battery in a Citroën C5, first, ensure the vehicle is turned off and the keys are removed. Open the bonnet and locate the battery, usually on the driver's side. Disconnect the negative terminal (black) first, followed by the positive terminal (red). Remove any securing brackets, lift out the old battery, place the new one in, and reconnect the terminals in reverse order, ensuring a secure fit.