I am having a frequent battery draining problem. Battery is new and has been tested recently to determine it's not the battery. Car is frequently needing a jump start, especially if it sits for a few days. It's not the alternator either, that's been reviewed. Something is obviously draining the battery. I have left nothing on so that's not it. Looking for ideas on what it could be and at what cost (simpler fix vs very costly one). Thx!