I would still be careful with a newer car. Call the dealer and ask. I will not leave my car again without disconnecting the battery or using a trickle charger. It has a lot of electronic frou-frou in it. If I have to reset a few things, not a big deal. A lot less hassle then replacing the battery. And mine was new, about 6 months old.
No lights were left on in the car. Everything was closed up and shut off. The dealer suggested disconnecting the battery next time we leave it that long. We're going to leave the '05 Magnum instead.
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