.. Get a Car Battery

Tina: Paul, the bartender. Talk to him about a car battery. ( Talk first to Roger, the cool guy. He will tell that Paul used to work in a car shop once. ) ( Ask Paul to borrow his car remote. )

Great. Now, just open a car with it.

There is an abandoned car at Downtown. Use the remote on it to open it. ( You can now grab the battery. )