Def-DT90-TPS Defender Dual Battery Kit  

Price $399.00


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

Our Defender 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 Def-DT90-TPS Kit includes the following parts:

  • 1 x Def-DT90 with Pre Sized cables
  • 1 x In-Cab Module + Hardware
  • 1 x  6B&S Black cable
  • 1 x battery terminal clamp set.
  • 1 x Length of 7mm Split Tube
  • 3m x 6mm Auto Twin Cable + Yellow Crimp Terminals on one end.
  • 2m x 5mm Auto Twin Cable
  • 4 x Blue Female Crimp Terminals.
  • 1 x 2 Way Screwblock Terminal
  • 2 x Flush Mount Power Sockets
  • 10 x Wire Ties

The Def-DT90-TPS 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 Defender. 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 in the battery compartment under the passenger’s seat and also provides power for new power sockets in the rear cargo area.

Because of the unique way the DT90 operates, you will have a total 75Ah of usable accessories power available ( when using an Optima D34 Yellowtop 55Ah battery ), whereas with any other type of isolator, you would need to fit a 100Ah auxiliary battery in the rear cargo area to achieve the same amount of useable accessories capacity.

CLICK HERE to Down-Load the full details of how the DT90 operates and it’s unique features.

The kit has comprehensive installation and operating instructions to make it easy for DIYers.

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

This kit takes about 3 hours to fit. 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.

Everything is assembled and ready to install and the price includes Australia Wide Postage.

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


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