CAUTION
Batteries give off hydrogen gas which is explosive. Keep any spark or flame
source away and DO NOT SMOKE around the battery! The battery electrolyte contains
sulfuric acid; if you should splash any into your eyes or skin, flush with plenty
of clear water and get immediate medical help.
Fill each cell to about 3⁄8 in. (9.5mm) above the tops of the plates. Always use distilled water (available in supermarkets or auto parts stores). Most tap water contains chemicals and minerals that may slowly damage the plates of your battery.
Some later model cars are equipped with sealed maintenance-free batteries which do not require normal attention as far as fluid level checks are concerned. However, the terminals require periodic cleaning which should be performed at least once a year.