A battery load test is performed by

A battery load test is performed by

• A. Loading the battery at half the cold cranking amps for 15 seconds
• B. Discharging the battery at full capacity
• C. Measuring voltage while not connected
• D. Charging the battery at high current

Answer: (A)

A load test checks the battery’s ability to deliver current while under a defined load. In automotive practice, you apply a load roughly half of the battery’s cold-cranking amps for about 15 seconds. This stresses the battery similarly to what the starter motor does, so you can see how well the battery maintains voltage under heavy use. If the voltage stays above the minimum acceptable level during that 15-second load, the battery is likely in good shape; if it collapses, the battery is weak or failing. Discharging completely to test capacity isn’t the same thing, because a load test focuses on current supply under starting-like conditions rather than overall energy capacity. Measuring voltage with no load only shows the state of charge when the circuit is open, not how the battery performs under load. Charging at high current tests how well the battery accepts a charge, not its ability to sustain a heavy current draw.

A load test checks the battery’s ability to deliver current while under a defined load. In automotive practice, you apply a load roughly half of the battery’s cold-cranking amps for about 15 seconds. This stresses the battery similarly to what the starter motor does, so you can see how well the battery maintains voltage under heavy use. If the voltage stays above the minimum acceptable level during that 15-second load, the battery is likely in good shape; if it collapses, the battery is weak or failing.

Discharging completely to test capacity isn’t the same thing, because a load test focuses on current supply under starting-like conditions rather than overall energy capacity. Measuring voltage with no load only shows the state of charge when the circuit is open, not how the battery performs under load. Charging at high current tests how well the battery accepts a charge, not its ability to sustain a heavy current draw.