If the battery terminals have been corroded by the acids in the battery itself or by other chemicals then it may not be able to be charged to function adequately or discharged at a faster rate. High quality WINNER closed type batteries are much more corrosion resistant than conventional batteries.
Suggested…
Thoroughly clean the surface of the poles with a damp cloth and then with a wire brush and cover the poles with a special protective spray or Vaseline ointment.
Caution!
The poles should be cleaned very carefully so that corrosion residues do not fall on your car engine or your clothes. They are very corrosive and wherever they fall on your clothes they will pierce them!