Water should not be applied directly to the exposed terminals of a battery if it has not been isolated or if there is a risk of electric shock. Firefighting operations can be hindered by the construction of some batteries that are designed to make them water resistant or waterproof. If personnel are in doubt about the correct firefighting techniques, they should seek specialist advice or consider manufacturer’s guidance.
Because of the difficulties associated with attempting to use extinguishing media on these batteries, internally they may become subject to thermal runaway. This reaction cannot be stopped by fire and rescue service actions and can lead to fires, explosions or sudden releases of flammable gases or hazardous materials.