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Most custom rigs like this Jeep have room under the hood for a spare battery. Some companies such as Tomken have battery trays that fit two Optima batteries side by side in the stock location. Optima also offers 6-volt models which are half the size of the 12-volt styles. By separating them you can save room and still have 12 volts by running them in series.
Dual Batteries for Any Vehicle

Most custom rigs like this Jeep have room under the hood for a spare battery. Some companies such as Tomken have battery trays that fit two Optima batteries side by side in the stock location. Optima also offers 6-volt models which are half the size of the 12-volt styles. By separating them you can save room and still have 12 volts by running them in series.  View Related Article