Okay looks like you have a parasitic draw on the battery , meaning something is staying on when the car is switched off .
Most common drain on battery's are aftermarket radio or other electrical add on's.
Doors not closing fully or bad door switch leaving inner lights on and draining the battery .
If the alternator was replaced because it was not charging then check the battery ,your battery may not be holding a charge
and draining itself over a few hrs from internal battery damage ..
Here is a good link to show you how to check yourself for a battery drain.
Please click here ..
Need any follow up help then please get back to me with the reply button, and not the poor or bad service.
This way i can get back to you or suggest another expert if needed.
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Kind regards Greg.