Discussion
Consider the following statements about battery testing.
1. A load test should hold above about 9.6 volts.
2. Parasitic drain is measured with all modules asleep.
3. Open circuit voltage should be read immediately after charging.
Which of the statements given above is or are correct?
Answer: D
The first two are correct, but surface charge makes an immediate reading misleadingly high and the battery must rest or be briefly loaded first. Each test has a precondition that decides whether the number means anything. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first. Most errors here come from carrying across a result from a neighbouring case where it does not hold.
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