DISCOVERY 3 Dual Battery Kit  D3-BD is $430.00

There are no other types of Discovery 3 Dual Battery kits that offer anywhere near the operating and charging advantages that our D3 kits achieve.


The D3-BD is a combination of the Cranking Battery to Auxiliary Battery Plug-N-Play kit, plus the Twin Power Socket kit, both specifically produced for a Discovery 3 and early model Range Rover Sports. This kit has the DT90 isolator, for protecting the Cranking Battery and the DT90 also has a Low Voltage Cut-Out ACCESSORIES Output, for protecting the Auxiliary battery from being accidentally over discharged.

This kit sets up a dual battery system under the bonnet and also provides power for a new power socket in the rear cargo area, plus rewires the existing Land Rover Power Socket to be power from the Auxiliary Battery as well.

Because of the unique way the DT90 operates, you will have a total 90Ah to 100Ah of usable accessories power available, whereas with any other type of isolator, you would need to fit a 120Ah 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 D3 dual battery set up.

See full details of how the DT90 operates and it’s unique features, on the DT90 page.


The D3-BD kit includes the pre-wired DT90 isolator & In-Line Circuit Breaker, Genuine Land Rover Battery Bracket and Hold Down Bolts, a Set of Battery Terminal Clamps, Auxiliary Battery Earth Cable, Circuit Breaker and Power Cable to the rear cargo area, a new Power Socket and all necessary Hardware to complete the installation. All you need is the Optima D34 Yellowtop Auxiliary Battery.

All cabling has been cut to the correct lengths and all Heavy Duty Terminals have been pre-assembled with 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.

This kit takes about 3 hours to fit. You only need to cut one hole, in the rear cargo area, to mount the new Power Socket. Everything is pre-assembled and ready to install and the price includes Australia Wide Postage.


Again, with the unique way the DT90 operates you can connect solar panels ( via a solar regulator ) or a battery charger to either battery in an DT90 dual battery set up and all batteries will recharged.

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