One battery is all the family car needs to drive to the supermarket, but for serious off-roading, a dual-battery setup can be a life-saver. A winch alone can place tremendous strain on a battery, and when you add the demands of a compressor, auxiliary lighting or even a stereo amp, your battery could use some backup. Plus, if your charging system fails in the wilderness, an additional battery gives you more range. CSE Offroad has everything you need to convert your vehicle to a dual-battery setup. The Optima batteries shown here are good choices because they have dual posts and are sealed, so they can be mounted in any position, giving you more flexibility in finding room under the hood. Choose from 800 or 750 cold cranking amps of power. Dual battery trays specifically made for some Jeep models are available, and the Rugged Ridge dual-battery relay kit provides the electrical parts you need for your setup. It includes a solenoid, a three-position switch, battery cables and wiring with the needed hardware.