The 12 volt cordless lawn mower and lower amp rating (6.5 to 8 amp) electric lawn mowers may experience some difficulty cutting Zoysia or Bermuda Grass. These types of grass are much heavier than other types and could be difficult to cut. The BLACK+DECKER 24-volt cordless lawn mower and higher amp rated (9 to 13 amp) corded lawn mowers would be the recommended models to use if your lawn consists of these grasses.