When reading a battery with issues, which measurement is more indicative of the problem?

Measuring voltage is crucial when assessing a battery with issues because voltage provides insight into the battery's state of charge and overall health. A healthy battery should have a voltage that is within the manufacturer's specified range. When a battery is unable to hold or produce the expected voltage, it can indicate internal problems such as sulfation, damaged cells, or general wear.

In contrast, while amperage and resistance measurements can provide useful information, they do not offer as clear a picture of a battery's condition. For instance, measuring amps can tell you how much current the battery can deliver, but it doesn't necessarily reveal the charge status or issues related to voltage drop. Similarly, resistance measured in ohms is more relevant in diagnosing connections or the condition of the internal elements, rather than the battery's overall health.

In summary, voltage measurement is more directly related to the battery’s performance and is typically used as a standard diagnostic tool for troubleshooting battery issues.