Battery capacity can be primarily determined by what method?

Performing a load test is the primary method for determining battery capacity because it involves applying a specific load to the battery and measuring its ability to maintain voltage over a defined period. This test allows for the assessment of how well the battery can deliver current while under stress, which is a realistic condition the battery would experience during actual use.

During a load test, the battery is typically subjected to a load that is half of its rated capacity for a duration, often around 30 seconds. The voltage drop during this test is monitored, and it provides insights into the battery's health and capacity. A healthy battery will maintain a voltage above a certain threshold, indicating that it can supply the necessary power when required.

Visual inspection primarily checks for physical signs of damage or corrosion but does not give a definitive measure of capacity. Analyzing voltage output can provide an indication of battery charge but is not sufficient by itself to determine capacity, as a battery may show a good voltage without being able to deliver adequate current. Calculating the age of the battery can give a rough estimate of potential capacity degradation, but it cannot accurately assess the actual performance of the battery at that time. Therefore, performing a load test is the definitive method to accurately gauge a battery's capacity under realistic