I have a small background with AC power and am trying to understand DC. I recently considered paralleling/serializing some batteries and realized how different a DC circuit is. Since a complete circuit of a battery is + to -, thus creating a short when connecting the two. Why then is it possible to connect the + and - of two separate batteries? Why doesn't this cause a short circuit? What little I know is that the battery wants to send electrons across to the side that has less, right? Why doesn't this happen then when the two batteries are connected in this way?