Batteries produce explosive ____ gases when being charged.

When batteries are charged, especially lead-acid batteries, they undergo a process called electrolysis. This process produces hydrogen gas as a byproduct. Hydrogen is a light, flammable gas that can be highly explosive when mixed with air, particularly in confined spaces.

The production of hydrogen occurs due to the splitting of water during the charging process, where the water decomposes into its elemental components, hydrogen and oxygen. While oxygen is also produced, it is the hydrogen gas that poses a greater risk of explosion due to its flammability.

Understanding this chemical process is crucial for safe practices around charged batteries, particularly in environments where ventilation may be limited, as the accumulation of hydrogen gas can lead to hazardous situations.