This is a real concern, yes!
After all, it is a big jump from a gap-powered car to an electric one.
While the Prologue is designed with modern battery technology, it is true that long-term performance can vary based on usage, charging habits, and environmental factors.
Man EVs (including the Prologue), come with warranties that cover the battery for a certain number of years or miles, usually around 8 years or 100k miles, which can give you some peace of mind.
Of course, battery tech is constantly improving, and manufacturers are focusing on durability and efficiency.
Also, note that most EVs maintain a good portion of their original range even after years of use, though some degradation is expected. Just stay informed about your charging practices and battery management because this is what will maximize its lifespan.
I hope this helps you to take a decision. Have a great one.