What is the typical resistance of a good battery under load?

A good battery under load typically exhibits a resistance that falls between 9.6 and 10.5 ohms. This range is indicative of a battery that is able to provide sufficient power to start an engine or run electrical components without excessive voltage drop or performance issues.

When a battery is under load, its internal resistance changes from its nominal state due to the chemical and physical processes occurring within the battery. A resistance in the specified range indicates that the battery is in good condition and can effectively deliver the necessary current to support the operational requirements of the vehicle or device it powers.

Resistance above this range could signify that the battery is underperforming or nearing the end of its lifespan, while a resistance below this range may indicate a short circuit or other issues affecting the battery's health. Thus, maintaining a resistance within the specified limits ensures optimal operation and reliability.