The document outlines 5 signs that a Jaguar battery is dying: 1) A bad smell coming from the battery could indicate a leak of toxic gas. 2) An old battery over 3 years old may not be holding a full charge. 3) The engine may take extra seconds to start up due to a worn-out battery. 4) Corroded connectors on the battery can disrupt voltage and make starting difficult. 5) Electrical components like lights and radio may dim or function at reduced power from a low battery charge.