When working with lead acid batteries, what safety measures should be observed?

When working with lead acid batteries, charging them in a ventilated room and avoiding sparks are crucial safety measures because lead acid batteries can emit hydrogen gas during the charging process, which is highly flammable. A proper ventilation system helps disperse any gas that may accumulate and reduces the risk of explosion or fire. The instruction to avoid creating sparks is equally important, as sparks could ignite hydrogen gas and lead to serious accidents.

The other options do not align with safe practices. For instance, wearing gloves is typically advised to protect against corrosion and acid exposure, while working in a dark environment can increase the risk of accidents due to visibility issues. Additionally, using water to cool a battery may not be an appropriate method, as it can introduce moisture that may further cause issues with battery integrity or safety. Thus, maintaining a ventilated area and being cautious about sparks is essential for safe handling and charging of lead acid batteries.