Step up transformer.
That depends on the battery. A car battery makes 12 volts. An AA cell battery makes 1.5 volts.
dc - the voltage is a constant 12 volts nominally in a normal car battery.
12 volts in a car battery
One is 9 volts and the other is 12 volts. They do not interchange!
Look at a car battery.
It will be a 12 volt battery.
A car battery has usually 12 volts.
12 volts just like a car.
12 volts
12-13 volts DC
Usually around 12 volts from six 2 volts cells connected in series.
A fully charged 12 volt battery will output 12.6 volts are read with a digital volt meter.