Honda 1991 Accord Wagon Owner's Manual page 107

The condition of the battery can be determined by checking the test
indicator. Service as required according to the label on the battery.
Any corrosion around the positive and negative terminals should be
washed off with a solution of baking soda and warm water. Dry the
terminals and then coat them with grease.
TERMINAL
TEST INDICATOR
The battery gives off explosive gases; keep sparks, flames and
cigarettes away. Provide adequate ventilation when charging or
using the battery in an enclosed space.
The battery contains sulfuric acid (electrolyte). Contact with skin
or eyes may cause severe burns. Wear protective clothing and
a face shield.
— If electrolyte gets on your skin, flush with water.
— If electrolyte gets in your eyes, flush with water for at least 15
minutes and call a physician immediately.
Electrolyte is poisonous.
— If swallowed, drink large quantities of water or milk and follow
with milk of magnesia or vegetable oil and call a physician.
KEEP OUT OF REACH OF CHILDREN.
Battery
TERMINAL