Dead Battery - Roof Down - No Power - Help Please
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Joined: Aug 2010
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From: Atlanta suburbs
It didn't take any charge, did manage to jump start though. Bought a new battery, then realised the original was under warranty. New battery was £105, woman in the shop got confused & refunded the invoice from 2020 at £149. So I made £44 and and got a new 5 year warranty for new battery. 
I suspect that jump starting your 2012 XKR damaged the Battery Monitoring System (BMS) module attached to the negative battery terminal if the negative charger cable was attached directly to the negative battery post. The negative charger cable must be attached to a chassis ground, and not to the battery.
BMS is a very complex system. For details, click here and see my Post #24.
Stuart
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