So my car has been garaged for two months with only minimal starting and driving by another Jag lover. This weekend it would not start but the starter gave a click. I am assuming that since the Interstate MegaTron is six years old, it is time to replace it.

Questions: Is the battery the likely cause? Since I cant get to it physically for two more weeks, will the car lose codes or presets with a dead battery? Will the radio lock up? Other issues?

Any battery preferences? And, if it is not the batt, other culprits?

Thank you.

 

Battery is probably the culprit. You might lose the seat memories but not much else for the XJ. The radio shouldn't need a code that is more a UK situation. You will find initially poor idling and a little hesitation when accelerating while the ECM relearns your driving.
Replace the battery and make sure all of the connections are clean and solid.

 

+1 avern1....so, if your going to store your vehicle (any make), for a lengthy time of 2 weeks or more, I highly, highly recommend a Battery Tender. It will keep your battery up to par, keeping the ghosts away and making it last longer and knowing it will be ready when you turn that key.
I travel for a living, weeks, sometimes months at a time, so I can guarantee this product personally. I have it on my Jag and a car that is horrid on batteries, my Corvette. Until I recently got rid of it (gave it to Make a Wish), I also had one on my 97 Expedition.
Every vehicle fired up on command every time I turned the key with the Battery Tender. Yeah this sounds like a commercial, but I am speaking from experience of the past 7 yrs.
...btw, I have a Die Hard from Sears in the Jag (7yrs old) and a Duralast from Autozone in the Vette (5yrs old).