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Thanks for commenting. I’ve never had it on a charger (is that what you mean by tender?) before and I don’t drive it for a week sometimes, with no prior issues. I’ll hook it up to one this evening though and leave it on there for 24 hours. Is the battery in the frunk? Can I open that manually with the physical key from inside the fob?

Thanks again
Not sure about the GT, but I'd guess it's similar, on the 570 there's a manual release near the the door hinge on the driver's side. In the frunk, there's a panel that comes off easily to access the battery. This is almost certainly a battery problem, despite what the car is telling you. Check the voltage directly on the battery.
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