In reference to "you guys with battery issues should check the electrolyte level" most, if not all, batteries you buy now are 'maintenance free' or 'sealed for life' and this cannot even be done. Also, I had the same battery drain issue and decided to change my battery as it has been in my car since I bought it [almost 5yrs] however, when I bought a new battery it does exactly the same...have yet to discover the culprit. The trunk light goes off as it should after a short time of closing doors. I do NOT let my car sit locked so that is not the issue either...I had heard it could be the tilt sensor [anti-tow] device in the trunk but have not pulled all the necessary stuff out to get to it and disconnect to see if it cures it.