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What is the initial voltage of a general car battery without engine running?

The initial voltage of a general car battery without the engine running is around 12.6 volts.

However, this can vary slightly depending on:

* Battery age and condition: A new battery will have a higher voltage than an older one.

* Ambient temperature: Cold temperatures can lower the battery voltage.

* Battery type: Different types of car batteries (lead-acid, AGM, lithium-ion) might have slightly different resting voltages.

It's important to note that 12.6 volts is the ideal resting voltage of a fully charged battery. If your battery reads significantly lower, it might be a sign of a problem.