What should be avoided during the maintenance of acid storage batteries?

Creating sparks is crucial to avoid during the maintenance of acid storage batteries because batteries can emit hydrogen gas, especially when charging or discharging. Hydrogen is highly flammable and can ignite if exposed to sparks, leading to potential explosions or fires. Maintaining a spark-free environment helps ensure the safety of the individual performing the maintenance and prevents damage to the battery and surrounding equipment.

In the context of other safety measures, wearing safety goggles is essential for protecting the eyes from acid splashes, while using a metal toolbox could pose a risk if it causes a short circuit or spark, though with careful procedures, metal tools can be used safely. Charging the battery is a standard procedure and is necessary for functionality, provided it is done properly and while observing safety protocols.