How Do You Connect Two 12V Batteries In Series?
12 volt batteries can be connected in two ways: in parallel or in sequence. Usually this will be dictated by the appliance they are to be used in: low-drain devices commonly use a parallel connection to preserve battery life while operating at a lower voltage, whereas devices with a higher power demand—such as flashlights— utilize a serial connection for a higher immediate voltage but faster drain. Assemble the batteries end to end. Ensure all batteries are the same type (Ni-Cad, Aluminum, etc.) and of equal charge. It is best to use batteries purchased at the same time, fresh from the box. Ensure the batteries are connected in a positive-to-negative chain. This means that the end of the battery with a (+) sign must be connected into the (-) end of the next battery. This is why the connection is called a “series,” as opposed to “parallel,” where the batteries are lined up side by side. You can also check the terminals themselves: positive terminals have a small protuberance, which
