before you blame the battery check your charging system my duster with mopar alternator and regulator didnt charge properly till 2500 rpm, on tick over or in trafic i drained the battery in no time. you might put on a new battery and still have a problem.
Thanks alex, glad you enjoyed the weekend. My battery may be ok but I left the lights on (fog) and it drained completely in 4 hrs. Mind you, it does have halogens which work a treat!