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2008 CX-9 Touring Battery Drain

2008 CX-9 Touring
Hello...if the car is parked for 3-4 days, when I try to start it the battery is dead. Something is draining my battery - actually, 3 batteries now.

Is this happening to anyone else?
2009 Mazda CX-9 GT
This can happen on any vehicle. Check for anything obvious staying on like the radio, something plugged into a power outlet, dome light etc. You can also remove the fuse(s) of circuits to narrow the search down. If nothing obvious is found, then you need a voltmeter and start checking circuits.