🔍 Key Concepts

• Battery charging and discharging can produce gases • Some battery gases are lighter than air and can collect near ceilings • Fire and explosion risks in enclosed spaces

💭 Think About

• When certain types of batteries are being charged, what byproducts can be released into the air? • Which of the listed gases in the options is actually a concern around batteries? • Think about which answer options describe a hazard that needs to be prevented in an enclosed space.

✅ Before You Answer

• Identify which gases are typically associated with lead‑acid battery charging • Check which listed gas is combustible or explosive • Eliminate options that describe effects that do not normally happen with batteries