What Should A Cars Battery Voltage Be. To do an additional test to determine the health of your car battery grab a friend to help you out. Normally a battery will be tested by making sure it is fully charged and then able to deliver a CCA current for a certain time - perhaps 1 to 2 minutes.
In detail this may be signs of a fault occurring or the battery isnt fully charged. When the vehicle is parked for extended periods of time the battery deteriorates sooner. Cold cranking amps or CCA is a rating that measures.
Even a slight difference from the figure 126 volts does matter.
When the engine is running that number should be between 137 and 147 volts. All vehicle engines require cranking power to start. These are the following recommended amount of voltage your car battery should have according to car experts. To get a true voltage reading of the cars battery it is important to measure the voltage after the car has been sat for a period with the engine off preferably overnight this provides you with the car battery open circuit voltage or also know as the resting voltage.
