This may well be a big no no with Jaguars but last time I changed a battery I knew that there would be issues with radio codes, window memory, central locking etc so I decided to do a little experiment. I connected my battery charger to the cables before I disconnected them. Switched on the charger, disconnected the cables, swapped the batteries, reconnected the cables switched off and disconnected the charger and the car worked exactly the way it did before I changed the battery! ZERO problems! 😉