Q: New battery and alternator, battery drains within 48 hrs

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Bought a new Duralast gold battery and alternator. Installed them both. Battery drains almost completely within 48 hrs. Had the alternator tested thinking it might have been defective. Alternator was good. I would like to know all possibilities as to what might be causing the issue. (why it could be happening, how to diagnose)

My car has 175500 miles.
My car has an automatic transmission.

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