Car wont start after sitting 2 weeks

[burningoilagain]

This has been on my mind for a while. I dont daily drive my si anymore, and after sitting a good two weeks the battery is completely dead. The battery is brand new. I also have aftermarket music, maybe 3 amps in the trunk paired with a yellow top battery. I had the battiers both tested and they said they were fine and when the car is off there was no drain. I wonder if this is normal because i do hear people starting their cars after sitting for a month. So weird

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