Battery keeps draining on 2006 BMW 530xi

My service tech said my battery is not charging due to short drive times and low MPH avg. I charge battery to 100% w/charger and it still will go dead over 3 days. I get the feeling there is an electrical drain via the tailgate/else where. Battery load test is fine. I get about 7-8 starts before its drained.

Asked by for the 2006 BMW 530xi
Friend's 530 had this problem secondary to a blocked drina in the sun rood ..lleading to a shorted wiring harness
530 xi wagon both sides in rear storage/battery compartments have water in them. Will look for clogged sun/moon roof drain. does any one know were they are?
2 answers 1 comment
Your feelings are justified, something doesn't sound right. If the battery is good and the alternator is charging OK, then the battery shouldn't go dead from a few days of short driving. I suggest you take this to another shop or to another mechanic at the same shop, but get another person to look at this.