Potassium Hydroxide

Ammonium chloride

Dilute sulphuric acid

Alkaline solution

1.6 V

1.8 V

2.0 V

2.1 V

Partial short

Buckling

Hard sulphation

Depolarization

Ammonium sulphate

Silica jel

Petroleum jelly

Sulphur powder

To escape the gas freely

To speed up the charging rate

To increase the specific gravity of the electrolyte

To reduce the sulphation defect