When working with acid storage batteries, what precaution should be observed to prevent accidents?

When working with acid storage batteries, guarding against sparks is essential because these batteries contain sulfuric acid and produce hydrogen gas during the charging process. Hydrogen gas is highly flammable and can ignite with even a small spark, which may lead to an explosion or fire. Ensuring that no sparks are generated in the vicinity of the battery while handling or charging it is crucial for safety.

The other options, while they may seem relevant, do not address the immediate dangers associated with battery work. For instance, using gloves can protect against acid burns; therefore, not wearing them is not advisable. Additionally, preventing direct sunlight exposure is important for maintaining optimal battery temperature but does not directly prevent accidents like sparks do. Finally, minimizing ventilation can actually increase the risk of igniting any hydrogen gas present, rather than mitigating it. Thus, safeguarding against sparks is the most critical precaution to uphold when dealing with acid storage batteries.