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Do you have a voltmeter and an extra set of hands? Simple testing you could do is measure the voltage across the battery terminals. Resting, key off, it should be mid 12's. Cranking over, it shouldn't drop below 10 volts, preferable staying about 10.5 volts. Running, you should be in the low to mid 14's with no electrical loads. With headlights, hvac, and wipers on it should stay above 13 flat. Try those tests and see what you come up with. It would help to measure the amps coming out of the alternator vs being consumed by the vehicle but its not capable on a normal voltmeter.
We could be dealing with an iffy battery, an iffy alternator, iffy wiring, or a combo. The stall issue could be unrelated, perhaps the computer still learning.
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