Depends on how much you want to spend.
As one poster said, battery powered ones wear out, the more you use them, the faster.
Usually it is just the battery pack but new packs are far, far from cheap.
I just had five re-celled for my drills and that was near 300 dollars.
For such a small lawn a GOOD and good and sharp , manual reel mower should work just fine.
For a gasoline one , a small used one might be best.
Electric with a cord, that depends on how well you deal with frustration.
Now many decades ago , my cousin fitted an electric one to work with a car battery. Worked well but heavy and needed charging before use.
