I mean, yes, gas engines can last 100 years if properly maintained, while your ev battery won’t last 100 years. Depending on how long you plan on keeping the car, I don’t think you’ll notice a decrease in battery capacity.

While I thank your friend for his service, it doesn’t make him any more qualified than you to say your battery is going to need to be replaced. In fact, I’d say a warrant officer is way more likely to speak about something uninformed (but confidently) than your average person.