At what battery level can the car not start?

[SanClayton]

Sedan batteries cannot start when the voltage is below 12V to 16V. The no-load voltage of a car battery is around 13 volts, and the load voltage is greater than 11 volts, generally between 12V to 16V. Before normal startup, the voltage should be above 13V; below 12V indicates a weak battery. After starting, the voltage should be above 14V. The quality of the battery depends on its capacity, which can be measured with a capacity meter. Precautions for charging car batteries: Connect directly to the battery for charging to avoid data loss from removing the battery; a battery voltage 10% below the rated voltage will cause the battery to weaken; avoid water entering the battery during charging. Functions of car batteries: When starting the engine, the battery supplies power to the starting system, ignition system, and electronic fuel injection system; when the engine is off or at low idle, it powers the car's electrical equipment; when the generator's output is insufficient, it assists in powering the electrical equipment; it mitigates voltage surges in the electrical system, protecting the car's electronic devices; it can store excess electricity generated by the alternator.