To produce a 12 volt output two 6 volt deep cycle batteries must be wired in series positive to negative. There are two methods to connect two 12 volt batteries.
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Two 12 volt batteries to make 12 volts. Add a second 12 volt battery to the circuit. One way doubles the volts of the two batteries and the other keeps the same amount of volts. How to make 12 volt battery charger easy way diy homemade battery charger duration. The series connection adds the voltage of both 12 volt batteries for a total of 24 volts. Disconnect the cable from the starters ground connection and connect it to the second batterys negative terminal. Wiring two 12 volt batteries in parallel provides longer battery life but the output will remain 12 volts.
Two or more 12 volt batteries wired in seriesthe positive terminal of one. In this way the voltages of the individual batteries are added together so six 2 volt battery cells become one 12 volt battery 6 x 2 12. Two or more 12 volt batteries wired in parallelpositive to positive negative to negativeis still a 12 volt system. You can use the same electrical technique to create your own battery packs at home. In parallel the voltage stays the same and in series it is doubled. Connect a battery cable from the second batterys negative terminal to the starters ground connection.
Wiring two 12 volt batteries in series combines the voltage from each unit to double its output thereby allowing the electric current to flow evenly through every component in the circuit. In a parallel connection the voltage remains the same but the overall amperage of both batteries is added together. To make batteries with higher voltages manufacturers link identical batteries in a series circuit. There are two ways to wire up two batteries. Each 6 volt battery pair operates as a single 12 volt battery. You can then connect each 6 volt pair in parallel with another pair to create a larger 12 24 or 48 volt battery bank.