My '97 850 kills the battery if it sits a day or so. Tried to check for current draw while parked, but had no draw at that time. Jumps off easily. Could it be coolant fan or do these cars have something they are known to do that causes this? First replacement battery (OEM) is a little less than one year old. It has done it in hor and cold weather. Have read some postings here and have seen it- only a time or two- get the anti lock and trax light come on and not go off until the car was switched off and restarted. Ignition switch??-Wife's car heavy set of keys. Any help appreciated. Contemplating putting on a "automatic turn off the battery if the voltage gets too low" thing inline if I can't solve this.

Thanks in advance.