I have a 2014 energi with 164,000 miles on it. It is flawless. I get 12 miles on a 6 hour 120 volt charge and still average 50 mpg +-.
Only had tires and 12 volt batter replaced. No other maintenance except oil and radiator flush.
If the main battery goes out I'd consider replacing it along with new shocks and spark plugs and drive it for another 164,000 miles. This is the most satisfying vehicle I've owned and we travel a lot for pleasure and sightseeing.
Probably cost me over 50 grand for a new car so 5 grand would be a winner to keep my car going.