[m5james]

So it seems the concensus is to either replace the battery with an AGM (BMW @ $510 or AutoZone/walmart H8 for $180 (which is what I run in my E53 and E38)) and/or replacing the IBC/negative battery cable for $200. It's been cold here in Seattle (mid 20's at night) and I got the high drain warning this morning even though I park in a garage, so we'll see what happens tonight when I leave work at 1am.