Wiring batteries in series creates a battery bank that maintains the batteries' capacity while increasing the voltage. For example, two 6-volt batteries of 10 amps capacity connected in series produce an output of 12 volts, while continuing to have a total capacity of 10 amps.
To connect batteries in a series, connect the first battery's negative terminal to the second battery's positive terminal with a jumper wire. Connect the open negative and positive terminals to the application to be powered using an additional set of cables. Use batteries wired in series to power a scooter, kids' vehicles or any other equipment. Never connect open cable terminals to each other, as this can lead to short circuits and possible injury. All batteries wired in series should have the same charging level.