Hi. So we all know that electricity requires a complete circuit in order for electrons to flow in a wire. It's my understanding that this is due to the charge differential at the positive and negative, creating an electric potential. So, given that (or correct me if my understanding is wrong): Why is there no electrical potential between the positive terminal of one battery and the negative terminal of another battery? This obviously does not create a circuit, but why does that charge differential between those two terminals not create an electric potential from which a current can be generated? How is the negative terminal of one battery "different" from the negative terminal of another battery? Thanks, this is puzzling me!