2003 Honda S2000 Owner's Manual - Page 179
2003 Honda S2000 Manual
Page 179 highlights
Battery If you need to connect the battery to a charger, disconnect both cables to prevent damage to the car's electrical system. The battery gives off explosive hydrogen gas during normal operation. A spark or flame can cause the battery to explode with enough force to kill or seriously hurt you. Wear protective clothing and a face shield, or have a skilled mechanic do the battery maintenance. If the terminals are severely corroded, clean them with baking soda and water. Then use a wrench to loosen and remove the cables from the terminals. Always disconnect the negative ( ) cable first and reconnect it last. Clean the battery terminals with a terminal cleaning tool or wire brush. Reconnect and tighten the cables, then coat the terminals with grease. 182 Maintenance