Diluted sulfuric acid (1.40 - 1.45 in specific gravity) or distilled water should be added for adjusting the electrolyte. It’s required quantity can be calculated by the formula below, in case that the specific gravity is more than 1.215 (20˚c) or 1.240 (20˚c) 5CC. of the distilled water and the same amount of diluted sulfuric acid, in the opposite case, shall be added to every one liter of electrolyte which is equivalent to specific gravity 0.001 in the difference between the specific gravity at the final stage and the specified value.

In case that the final specific gravity is 1.228 (20˚c) on type 600AH storage battery with 13 liters of electrolyte the quantity of distilled water to adjust the specific gravity from the above 1.228 down to 1.215 (20˚c) will be obtained by the following calculation:

13 X 5 X (1.228-1.215/0.001) = 845 CC

Consequently, 845CC of the distilled water should be added. In case that the finial specific gravity is 1.220 (20˚c) on other type of storage battery with 12 liters of electrolyte, the quantity of diluted sulfuric acid to adjust the specific gravity from the above 1.220 up to 1.240 (20˚c) shall be calculated as follow:

12 X 5 X (1.220-1.240/0.001) = - 1,200 CC

Consequently, 1200CC of diluted sulfuric acid (1.40-1.45 in specific gravity.) should be added. As shown above, the distilled water or diluted sulfuric acid (1.40-1-45 in specific gravity) is added in case of (+) or (-) of answer on the calculation formula respectively. After adjustment keep charging for several hours in order to thoroughly stir and mix the adjusted electrolyte by gassing. After the charge above, the each cell's specific gravity and temperature should be re-checked respectively in order to confirm the result of adjustment of specific gravity.