D4-5U Discovery 4 Dual Battery Kit  

Price $795.00
MPN: D4-5U


There are no other types of Discovery 4 Dual Battery kits that offer anywhere near the operating and charging advantages that our D4 kits achieve.

Our Discovery 4 kit will allow you to recharge batteries at up to 6X faster than a DC/DC device


NOTE you do not require any form of electrical experience to fit this kit and you only need basic handyman skills and some basic tools to install this kit.

The D4-5U kit is a HIGH CURRENT version of the D4-5S and is a combination of three kits, the Cranking Battery to Auxiliary Battery Plug-N-Play kit + the Power Socket Extension kit + the Heavy Duty Power Cable kit, which provides charging power for house battery(s) located in a caravan or camper trailer.

This kit is specifically produced for a Discovery 4 and late model Range Rover Sports and comes with the USI-160 Heavy Duty Isolator, for protecting the Cranking Battery, and the ABG-25 isolator, our Low Voltage Cut-Out Unit, for protecting the Auxiliary battery from being accidentally over discharged, plus provides heavy duty cabling to the rear, to a 50 amp Anderson plug.


Because of the unique way the USI-160 ( in SHARED Mode )  operates, you will have a total 90Ah of usable accessories power available, and with any other type of isolator, you will need to fit a 115Ah auxiliary battery in the rear cargo area to achieve the same amount of useable accessories capacity.

So this kit will save you money, weight and space over any other D4 dual battery set up.

CLICK HERE to see full details on how SHARED mode works and other USI-160 features, see the USI-160 page.

The kit includes the USI-160  Heavy Duty Isolator, two Heavy Duty Positive Cables, Heavy Duty Auxiliary Battery Earth Cable, our Stainles Steel D4 Battery Tray, Battery Bracket and Hold Down “J” Bolts, Set of Battery Terminal Clamps, Auxiliary Battery Earth Cable, the ABG-25 Isolator, a Power Socket, Circuit Breaker and Heavy Duty cabling to the rear, 50 amp Anderson plug and all necessary Hardware to complete the installation. All you need is the Optima D34 Yellow Top Auxiliary Battery.

All cabling has been cut to the correct lengths and all terminals have been pre-assembled including Heat Shrink and Split Tube protection, so there is no need for any special tools when fitting one of these kits.

The kit has extensive installation and operating instruction, which include numerous photos to assist in making the installation easy for DIYers.

You only need some basic Handyman Tools to complete the installation.

See full details of how the ABG-25 operates, on the ABG-25 page.


All the cabling has been cut to the correct length and all terminals fitted and protected with heat shrink and the positive cabling is covered with split tube.


This kit takes about 5 hours to fit. You only need to cut one hole, in the rear cargo area, to mount the new Power Socket. Everything is assembled and ready to install and the price includes Australia Wide Postage.


Again, with the unique way the USI-160 operates in the SHARED Mode, you can connect solar panels ( via a solar regulator ) or a battery charger to either battery in a USI-160 dual battery set up and all batteries will recharged.

If you have an Anderson plug mounted at the back of your vehicle, you can make your solar or battery charger connection through the Anderson plug and again, all batteries in a USI-160 dual battery set up will be charged.

But if you have a specific need to only charge your Auxiliary Battery, then by selecting IGNITION Mode and connecting the solar panels or battery charger to the Auxiliary Battery, you will be able to charge it, while the Cranking battery remains isolated.

All our isolators are supplied with a 5 year Parts and Labour warranty and a Lifetime Repair Guarantee.

Please note, this kit is NOT suitable for most models of the Discovery 4 ( & late model RRS ) outside Australia, where there can be either a Fuel Heater or Air Intake fitted in the space just in front of the Craning Battery Compartment. The range of Discovery 3 kits will fit a D4, with some rearranging of the components in the D4’s Auxiliary Battery compartment.


Review D4-5U Discovery 4 Dual Battery Kit  .

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