
Danger of Exploding Battery
Batteries generate explosive gases. It only takes a small spark, flame or burning cigarette to set off a dangerous explosion. Therefore ignition sources must be kept well away at all times.
Hydrogen and oxygen gases are produced during normal battery operation and escape through the battery vents. Make sure working areas are well ventilated to avoid creating an explosive atmosphere around the battery.
Ensure safety precautions continue to be observed after a battery has been charged as explosive gases may still be present for several hours.
An exploding battery may cause serious injuries including eye injury from flying pieces of the case or cover. Always wear safety goggles and a face shield when working near batteries. Never lean over the battery during charging, testing or 'jump starting' operations. Do not break 'live' circuits at the terminals of batteries because a spark invariably occurs at the point where a 'live' circuit is broken.
Make certain the charger cable clamps or booster leads are clean and making good connections. A poor connection can cause an electrical arc which could ignite the gas mixture and explode the battery.
Take care to ensure tools or other metallic objects do not fall across the terminal or any adjacent metallic part of the vehicle.
Do not smoke when working under the hood of a car or near a battery. Never strike a match or bring any other flame near a battery.