I have a 2009 Citroen and the battery is secured with a bolt that is under the battery compartment and to access it you need to go under the car with a very long wrench, who engineered it is a psycho
Since Dante wrote _The Inferno_, there has been a circle in Hell added where car designers are endlessly changing the spark plugs on AMC Javelins, bleeding brakes on Ford Escorts, and similar maintenance tasks which the design made more difficult than is reasonable.
Had to help a fella replace a battery in what I believe was a Mitsubishi... had to remove the front tire and the wheel well liner first!
I had a 2004 Citroen, which needed the front sidelight bulb replacing, after investigating for 20 minutes, decided to ask the garage how much it would cost next time it was in.