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.

by in Menominee, MI on April 21, 2010
2 answers 1 comment
ANSWER by on April 21, 2010
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.
ANSWER by on October 25, 2010
Friend's 530 had this problem secondary to a blocked drina in the sun rood ..lleading to a shorted wiring harness
COMMENT by on May 16, 2011
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?