[richtazz]

Take both battery cables off and check to see if they are corroded, or if either post on the battery itself is loose or leaking acid. If the side post is leaking acid, it's broken inside and the battery is junk. Also check voltage at the battery to see if it's dead. Voltage should be 12.6-13.2 with the key off and 14.8-16.2 with the car running. If voltage is lower than the above readings, either the battery is shot or the charging system isn't working.