I would check age of battery. Batteries these days are made with cheaply coated parts and only last about 5 years. Many times a bad battery will over work the alternator making them go out. Since you have changed the alternator I am assuming that you checked and cleaned the battery connections.
yes I have
I do suspect the battery, If the battery is new, then you probably have a short and that is hard to find. Check YouTube on that as it's a long process.
But go through this first, have you tried checking the alternator and making sure you are actually charging. Basically, start the car, then check the charging using a voltmeter on the battery posts. You should have 14+ volts at the battery when the car is running.
Also, Even a new battery can be bad. I would charge the battery up and then check its voltage (not connected to car) then let it sit overnight. Check voltage again. It should be very close to what it was the night before. If not, bad battery. If it's the same, then reconnect and start looking for the short.
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