What causes a battery drain on a 1997 dodge neon

How old is the battery? Is there any aftermarket alarms or stereos installed? And are the cables clean and tight? If the battery is new and the cables are tight you have a parasitic drain. you need a DMM, disconnect negative terminal and place one lead on cable, one on post. Set DMM to amps and compare reading to man. specs usually between 20 to 50 milliamps. If out of spec disconnect one fuse at a time looking for a fall in the reading and that will tell you what circuit has the issue