Kia Rio 2009
I left the light on in my car over night accidently. The next day the battery was flat and wit booster cables it started and so I took it for a run. This morning it was completly flat again. Put the car on a slwo charge of and hour and then left the car running after 45 minutes in went off and completly flat again no lights on dashboard. Is it battery, or Alternator? Thanks