2003 Honda Civic Owner's Manual - Page 225
2003 Honda Civic Manual
Page 225 highlights
Battery Check the condition of your car's battery monthly. You should check the color of the test indicator window, and for corrosion on the terminals. TEST INDICATOR WINDOW Check the battery terminals for corrosion (a white or yellowish powder). To remove it, cover the terminals with a solution of baking soda and water. It will bubble up and turn brown. When this stops, wash it off with plain water. Dry off the battery with a cloth or paper towel. Coat the terminals with grease to help prevent future corrosion. WARNING: Battery posts, terminals, and related accessories contain lead and lead compounds. Wash hands after handling. Check the battery condition by looking at the test indicator window on the battery. The label on the battery explains the test indicator's colors. 224 Maintenance