Hi all, Lets say i have a battery with a rated voltage of 3V. This means that there is a potential difference of 3 V across the +ve and -ve ends of the battery. This can mean 3V/0V, 5V/2V, 6V/3V and the list of possible combinations goes on. My question: Is there any way of knowing the absolute voltage values at the +ve and -ve terminals of the battery? Can we safely take it that the -ve terminal is at ground potential (i.e. at 0V)?