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I'd be very wary of replacing the battery. That's probably the single most often misdiagnosis here, leading to spending major coin that doesn't fix the problem. A simple test is to fully charge the battery, then remove the negative terminal overnight. If it's dead the next morning the battery is toast. If it holds the charge overnight the problem is parasitic power drain. Obviously you want to do this when you've got time the next day to give the battery one last charge to start the car before you drive to Autozone or the like for a new one.
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