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Unscrew the four knobs on the back panel in the trunk and then remove the panel to expose the battery.
Just to just charge it, however, you do not need to access the battery. You can use the charge point behind the left hand wall grill at the front on the trunk. Just pop out the grill. Connect positive at this charge point and ground to a stud next to the spare tire on the floor of the trunk.
I tool out the left side of the luggage trim panel and could not see the battery. Where is the battery and how do I charge it up?
Welcome to the forum maxe,
I've moved your question from General Tech Help to XK/XKR forum. This is the place to post technical questions about your model.
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.