In terms of battery maintenance, which action is crucial to prolong battery life?

Regularly topping off with distilled water is crucial for prolonging battery life, especially in lead-acid batteries. These batteries rely on a liquid electrolyte to function properly. Over time, through the process of charging and discharging, water in the electrolyte can evaporate or be converted to gas, leading to a decrease in the electrolyte level. If the electrolyte level drops too low, it can expose the plates, causing lead sulfate to build up on them and potentially leading to irreversible damage. By consistently adding distilled water to maintain the proper electrolyte level, the battery can operate more efficiently and have an extended lifespan.

Frequent full discharges, high-temperature charging methods, and keeping the battery uncovered do not contribute positively to battery maintenance. Frequent full discharges can strain the battery and reduce its capacity, while high-temperature charging can lead to overheating and damage. Keeping the battery uncovered exposes it to contaminants and increases evaporation, further complicating maintenance.