2002 Dodge Intrepid Battery won't hold a charge

You need to get the battery charged, otherwise, you can't do any testing.

If the charging system is working fine, then check for a battery drain. Where applicable, faulty alternator diodes can cause battery to drain.

You also check for battery drain by pulling/replacing fuses, one at a time. When you pull the fuse on the faulty circuit, the excess drain goes away. You can use a digital multimeter on the amp setting. Take battery cable loose, use meter leads between cable and battery post, key off, you can see the amp draw. Probably shouldn't be more than.030 ma.