How normal is the battery voltage of Cadillac?

11.8v-12.8v is the normal voltage range.

The normal voltage range of Cadillac battery is between 1 1.8V and12.8V. The battery voltage will be slightly lower when the vehicle is turned off, so it should be kept within the normal range when the engine is started. If the voltage continues to be lower than 1 1.8V or higher than 12.8V, it means that there are problems with the battery, such as battery aging and charging system failure, so it is necessary to check and repair it in time.