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Message: <blockquote data-quote="kuntakinte" data-source="post: 727704" data-attributes="member: 15653">I managed to trace the root of the error message to an unexplained starting of some fan or blower when the car is left stationary for some time.  Discovered this by accident when one evening sitting in my porch, I heard a faint but audible whirring sound coming from the car near the windshield wiper area.  The sound stopped the moment the remote key to open door is pressed.  The next day, when I started the car, the battery discharge message appeared.  Several days later, the same thing happened.  This was on a courtesy 316i I had.I think it may have to do with the climate control. When I try to toggle internal air circulation to manual, the sound seems to appear when car is left idle. At auto, there was no sound.  Maybe for some reason, the system is trying to recirculate fresh air into the cabin when left at manual for extended periods of time.I think It's ok to get outside battery with the same AGM build and specs. The only problem is that I read somewhere the battery needs to be ''registered' with the car via some handshake due to the charging abilities of Eco pro and may involve programming, if anyone can confirmSo, yeah, conditioning the battery to prolong its life is important, so whichever way you look at it, the ctek is a worthwhile investment</blockquote>