Why did the rear end drop down too low to drive after exchanging the battery?

Hello, I can't imagine why the suspension would drop too low after replacing the battery. It's possible there's a suspension concern that was being circumvented by having consistent battery power. But it's something that will need to be evaluated by a technician near you that has experience with Jaguar and necessary equipment to perform needed testing. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops