Replace The Battery on a Dodge Challenger
The battery on the Dodge Challenger is located in the trunk under the carpet in the spare tire compartment. Fortunately, this makes the battery pretty easy to get to and replace.
Make sure you find an adequate replacement as the battery must vent using the provided vent tube. It is dangerous to use a non-vented battery in the passenger compartment.
Open the Trunk
Pop open the trunk and flip the carpet floor panel open.
Disconnect the battery
Remove the negative terminal connector using a 10mm socket or wrench.
Remove the positive terminal connector
Disconnect the vent tube
Remove the Battery
Unbolt the Battery Hold Down bracket. It's located at the rear base of the battery, you'll need a 10mm socket and an extension.
Remove the bolt and bracket.
Loosen the battery holding strap. Just press the metal tab down to release the strap.
Flip up the handle on the battery and remove it carefully. It's extremely heavy.
Install the New Battery
Carefully seat your new battery in place, sliding it tightly to the front outside corner of the compartment.
Re-install the strap, vent tube, and battery hold down bracket.
Re-attach the battery terminals and snug the terminal nuts.
Re-install the positive terminal cover and you should be done.