Genesis Offroad Jeep JK Dual Battery Kit with 85 AMP Isolator and Extension for 2007-2011 The most complete and easiest to install dual battery system for the JK Wrangler, proudly made in the USA Completely pre-wired out of the box - all wires line up with the battery posts - Group 34 batteries required Boost button to jump start from your second battery if the cranking battery is dead Power & Ground bus bars make it easy to connect accessory wires Smart Isolator connects batteries when cranking battery is above 13.2v for 2 minutes, disconnects at 12.7v for 1 minute