JK Dual Battery Kit

JK Dual Battery Kit

This is the most complete and easiest to install dual battery system for the JK Wrangler.

  • Completely pre-wired out of the box
  • Fits 3.8L, 3.6L, Hemi 5.7L & 6.4L, and European diesel engines
  • Boost switch included - jump start your vehicle off your second battery
  • Power & Ground bus bars make it easy to connect accessories
  • Smart Isolator automatically handles all charging functions
  • NEW FEATURE! Interface port pre-wired for the G Screen monitoring system
  • Integrated fuse box holder and evap solenoid holder
  • Best quality wires, soldered and crimped connectors, sealed heat shrink tubing
  • Powder coated for durability
  • Proudly made in the USA


Download the installation instructions - Revised 8/14 - 10MB 

Installation article in 4 Wheel Drive & Sport Utility magazine

Asylum TV review and installation video

Off Road Xtreme installation article

Our price: $479.00

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The top cover plate has several innovative features in a simple package. All of the wiring has already been done for you, and the smart isolator comes pre-installed. The welded gussets on top have holes with grommets to route the wires directly to the correct battery post, so there's no guess work involved to make the connections. Use the extra grommets for routing your own accessory wires cleanly and neatly to the power and ground bus bars. High quality battery terminal connectors are soldered and crimped to the flexible 2 gauge wire connecting the batteries together. With all the wiring integrated into the top plate, servicing your batteries has never been easier. Simply pull the terminals off the battery posts, remove the 4 easily accessible stainless fasteners securing the lid, and all the wiring can be lifted up and out of the way to service your batteries when necessary. 

Watch our quick overview video from the 2014 Overland Expo East show in Fletcher, NC.


Watch this more detailed overview to learn why this is the most complete and easiest to install kit on the market.

The included smart isolator gives you automatic control of all the charging functions with no interaction required.

Here's how it works.

  • When both your batteries are fully charged at 13.2 volts, they are automatically connected and are charged at the same time.
  • When you park and turn off the engine, but continue to use accessories such as lights or the stereo or a CB, both batteries begin to drain down.
  • When your main cranking battery reaches 12.7 volts, the smart isolator separates the batteries, so that your cranking battery will have enough power to start the engine. The second battery continues to power your accessories for as long as it will last.
  • After you crank the vehicle, your main cranking battery will be charged up to 13. 2 volts first, and then the isolator will begin charging your accessory battery. By only charging one battery at a time, your alternator is protected from excessive strain.

What if your cranking battery is somehow drained down too low to be able to start the vehicle? We have a solution for that.

  • Press the Start Boost button and the isolator will connect both batteries together for 1 minute, acting like built-in jumper cables to jump start your engine off your accessory battery.
  • As long as the combined voltage of the 2 batteries is at least 12.7 volts, you'll be able to start your vehicle instead of being stranded with a dead battery!
  • The alternator will charge both batteries for 1 minute, then switches back over to automatic mode to reduce the strain on your alternator.
  • A remote status indicator light can be added on your dash to show you when the batteries are connected, indicating that they are both fully charged. Simply extend the white wire on the isolator to your indicator light, then to an accessory power source. 
Also includes high amp power AND ground bus bars. The bus bars are already pre-wired to the accessory battery. Now you can quickly and easily connect your winch, lights, amplifiers, and lots more while keeping the wiring neat and orderly. Your winch or other high-amp accessories go onto the large center post on the bus bars, and all your other accessories go directly to the smaller screw terminals on the bus bars.
NOTE: 2007-2011 model years require a short extention cable for the evap solenoid. The extension is made with OEM connectors and wires to ensure a perfect watertight fit for easy installation. This piece is not required on 2012+ JKs. Be sure to specify your year model when ordering.
Battery Options:
  • Any Group 34 battery will fit our tray
  • For your convenience, you can select from the Optima Red Top or Yellow Top, or the Odyssey PC1500 from the menu above to have the correct battery drop shipped to your door for less than you'll pay at the store with sales tax
  • NOTE: Batteries ordered through Genesis Offroad will ship seperately from the tray due to shipping regulations.
  • Optima Red Top is a good engine starting battery, but not recommended or warranted for use in deep cycle applications. 800 CCA, 50 Ah capacity, 100 minute reserve time
  • Optima Yellow Top is a good high power, dual purpose engine start and deep cycle battery. 750 CCA, 55 Ah capacity, 120 minute reserve time
  • Odyssey 34-PC1500T is for those who need the most capacity possible! 850 CCA, 68 Ah, and 135 reserve time
  • The original factory battery will not fit due to its larger size
  • Both batteries must be the same physical size for the top lid to securely hold them in place
Isolator Option:
Technically speaking, the isolator rating should match the alternator output rating. In real world application, the actual output of the alternator is much lower than the published rating, so the 85 amp isolator is plenty sufficient for most Jeep owners. Some Jeep owners like to do everything overkill just for peace of mind, so there's no downside to going with the upgraded version.
  • Standard 85 amp - suitable for most general purpose uses, including Jeeps with a winch, lights, CB, etc.
  • Upgraded 200 amp - highly recommended for Jeeps with multiple high amp draw accessories such as big stereo systems or lots of electrical components. Required if using an aftermarket high output alternator.
NEW! G Screen Monitoring System
G Screen
Need to keep a closer eye on your batteries? Check out our new dual battery monitoring system - the G Screen.
  • Voltage levels for each battery
  • Remote status indicator
  • Background color changes based on battery status
  • Remote boost button
  • Completely pre-wired for you!
  • Multiple mounting options
  • Order with your battery kit for free shipping

Already know you want one? Simply add it from the options above, or see more details on the G Screen product page first.


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Integrated fuse box holder and evap solenoid relocation tab
Heavy duty gussets on the bottom for extreme durability
Pressed-in nuts for easy assembly
Fits with Teraflex hood lift pistons
Magnuson Supercharger in 2014 3.6L

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