What does a battery test measure?

A battery test primarily measures the battery's ability to hold a charge and its overall health. This assessment typically involves checking the battery's voltage levels, load capacity, and internal resistance. By evaluating these parameters, technicians can determine whether the battery is functioning properly and can still deliver reliable power to the vehicle's electrical systems.

Other options, while relevant to understanding different aspects of battery performance, do not directly represent what a typical battery test measures. For example, while the lifespan of a battery can be influenced by its charge retention and overall health, a standard test does not quantify lifespan in precise terms. The battery's temperature can provide insights into its operating conditions, but it is not a direct measurement of the battery's performance or health. Lastly, the visual inspection of a battery's appearance can reveal physical damage or corrosion, but it does not provide quantitative data regarding how well the battery can hold a charge or function overall.