Checking Electrolyte Level: Notes

WARNING: Do not allow battery fluid to come in contact with skin, eyes, fabrics, or painted surfaces. After touching a battery, do not touch or rub your eyes until you have thoroughly washed your hands. If acid contacts eyes, skin or clothing, immediately flush with water for 15 minutes and seek medical attention.

Remove the cell plug using a suitable tool.

Fig 1: Checking Electrolyte Level
Courtesy of NISSAN MOTOR CO., U.S.A.
Add distilled water up to the MAX level.