This is my 2012 Hyundai Sonata. I did not drive it for ten days. When I returned home, the battery was dead. I have never had that experience on any car ever I drove.
This Instructable applies to my car, but with all of the modern electronics running in the background on today's automobiles, your car may have this problem, too. This Instructable tells about the solution to my problem, but may be helpful with a similar problem on your car, too.
Materials needed for this Instructable--none
Multi-meter with an ammeter scale capable of reading up to about three amps.
8 mm socket wrench and ratchet
Spring clamp for connecting a small alligator clip to the battery post