you need a multi-metre really to check the condition of alternator and battery, given the car is only 2 years old it's more likely to be battery, it's shocking a battery can only last 2 years these days.. having said that my car isn't even a year old and I've never been impressed with battery! I don't have any drains but still the voltage drops daily more than any other car I've ever owned!!
Better to call it DMM or DVM, funny that you used the wrong spelling for that, I usually use the wrong spelling when writing length/distance, but there you go.
These EFB are designed to be used in the well the car uses/treats them - but it seems like many do fail early if the car is not used frequently for longer journeys - my daughter's end of May 2019 SEAT Leon
Cupra EFB is in a much
lower level of condition/health than my wife's August 2015 VW Polo 1.2TSI EFB - and that I feel is down to the length of normal journeys used and auto Stop/Start being left on in the case of the
Cupra, together with that
Cupra being pre-reg'd in May 2019 and only brought to the selling dealer's compound in August 2019 with "low battery" faults logged - it does not look good for it length of life wise, she does have a CTEK charger to take care of it better now.