Spark Plug Question

[preno]

Problem: Ayaw magstart pero may redondo. 2+ years na yung battery.
Solution: Nagpalit na ko ng bagong battery. Pero ayaw pa din magstart.

Another solution: palitan yung spark plug.

Car info: Mitsubish Mirage 2013 GLX Manual. Mileage: 16,XXX km

Ito yung picture ng spark plug (parang kakaiba spark plug ba to?)