When disconnecting the Car Batteries on 2015 and later models with a navigation system or rear seat entertainment system, it is important to follow a specific procedure to prevent damage. Start by disconnecting the negative battery terminal, followed by the positive terminal. Then, remove the battery hold-down clamp and nuts. Carefully lift out the heavy battery using battery straps or handlers for easier removal and carrying. If replacing the battery, ensure the new one matches the dimensions, amperage rating, and cold cranking rating of the old battery. Transfer the heat shield from the old battery to the new one. When reinstalling, connect the positive cable first and the negative cable last.