Battery draining quickly - '09 MDX
My wife's 2009 Acura MDX has always had some battery issues, but its typically been a case where it hasn't been driven in a few days and temperatures are low. Typically, a jump has gotten it going again, and there weren't issues again for a while. Recently, we had a fit where the battery was dying frequently, even after we recently purchased a new one (it was about 2 years old, inside the 3 year warranty). After 2 recharging trips to AutoZone and their assurance there was nothing wrong with the battery or the alternator, they finally replaced our battery. Fast forward about a month, we went out of town for the weekend, came back, and the battery is completely dead.
Any ideas on what could be causing this? The terminals all look to be in good shape, and the alternator tests always come back good. There seems to be something draining the battery while the car is not in use.