The first thing you should check is the cables themselves. If they have excessive corrosion they cannot send the power to the electrical system. Remove them from the battery and clean them, and the posts, with a Wire Brush. If it's a late model vehicle you can check for power at the Main Fuse, usually located under the hood. Will your lights come on ?
It varies by manufacturer and battery.
It is there to keep the battery fully charged.
12.7 volts
1.265
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
how do you know the battery is charged? also it could be a loose battery wire. they need to be properly thighten so the energy could flow. if there are no lights theres no power coming from the battery.