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It varies by manufacturer and battery.
1.265
It is there to keep the battery fully charged.
12.7 volts
A: The reason being that is the normal car battery potential when fully charged and to be Mobile means it must have a power source like a car battery
The alternator provides DC power for all the electronics and the engine. It also keeps the battery fully charged.
The battery is the storage device for electricity in the vehicle. However the alternator is what creates electricity to keep the battery fully charged and to run all the electronics in the vehicle.
2.2 v when fully charged.
Normally in off load, its about 12.6 volts. 12.6 is correct for a fully charged battery. 12.4 it is 75% 12.2 it is 50% 12.0 it is 25%
With no charging the battery could last a few minutes. There is a large amount of power needed to move a car forward. Starting would shorten the time.
check your fuses could possibly be a fuseable link by the starter
If you need to jump start the car then the battery may be fully charged but it is defective and needs replacing. A full charged battery will read 12.6 volts at the posts with the engine not running. 12 volts indicates the battery is only 25% charged.