My question may seem naive so please bear with me. I just began learning about circuits and I am having problem seeing how two or more batteries can be connected in series and how the current flows in this type of situation. Like when there is only one battery, you know that there is negative and positive terminal in that battery and that when current come out of out terminal, it travel down the circuit and enter the other terminal of the same battery. However when batteries are connected in series, how do currents flow from one side of terminal to another? Since batteries are connected in series, when current comes out of one terminal and travels down wire, wouldn't it reach touch the terminal of another battery, not the same battery from which the current initially came out of?
How are the battery in series organized? Is there is connection inside each of the batteries, like a tube, when electrons/current travel across each batteries?