What should be used to top up low battery fluid?

Topping up low battery fluid requires the use of distilled water because it is free from impurities and minerals that may be present in other types of water. Distilled water ensures that there are no contaminants that could potentially harm the battery's performance or lead to chemical reactions that could shorten its lifespan. Using distilled water helps maintain the proper chemical balance within the battery, allowing it to function correctly and safely.

In contrast, spring water and well water contain minerals and other substances that could introduce impurities into the battery, potentially affecting its efficiency and leading to corrosion or other issues over time. Using any type of water without care, such as tap water or mineral-rich water, is also unsuitable as it can compromise the battery's integrity. Therefore, distilled water is the only appropriate choice for topping up battery fluid.