A high-rate discharge (battery capacity) test is being performed on a 12-volt battery. Technician A says that a good battery should have a voltage reading below 7 volts while under load. Technician B says that the battery should be discharged (loaded) to twice its ampere-hour rating.
Who is correct?*
A. Technician A
B. Technician B
C. Both A and B
D. Neither technician
The Correct answer is D, neither technician.
The discharge (load) test of a battery should be three times the battery’s amp-hour rating or half of its Cold Cranking Amps (CCA) rating. The load test should be applied for 15 seconds, and battery voltage should not fall below 9.6 volts at 70oF (21oC) or higher.