To start a vehicle, it is ideal for the battery to have a certain minimum voltage level. Generally, it is assumed that a lead-acid battery, like a standard car battery, must have a sufficient voltage of about 12.4 to 12.6 volts to start reliably. This is considered a “full” battery.

However, it is important to note that the voltage of a battery is not the only factor that affects starting a vehicle. Besides the voltage, the internal resistance of the battery also plays a role. A battery with a lower voltage but low internal resistance can still supply enough current to start the vehicle.

In practice, it may happen that a vehicle with a battery that is slightly below the ideal voltage can still start. But if the battery voltage is too low, the vehicle may have trouble starting or may not start at all. It's also important to note that in cold temperatures, when the battery is less efficient, a higher voltage may be required to start the vehicle.

If you notice that your vehicle has problems starting, it is advisable to check the battery using a voltmeter or a battery tester. This will allow you to measure the battery's voltage and determine if it is sufficiently charged. If the battery voltage is too low, it may be necessary to charge or replace the battery.

It is always recommended to consult your vehicle manufacturer's specific recommendations regarding the ideal voltage and maintenance procedures for the battery.