Under Bonnet Dual Battery Kit for Mitsubishi Triton MQ-MR (2.4L TD, 2019+)

Running a fridge, lights and a comms setup off your cranking battery is how you end up stranded at the far end of a track. This under bonnet kit gives the Triton a proper second battery, charged intelligently while you drive, with every bracket, fuse and length of cable cut to suit the vehicle.

At the centre is the REDARC BCDC1225D, a 25A DC-DC charger that takes your alternator output and delivers a full multi-stage charge to the auxiliary battery, something a simple isolator or VSR cannot do. It accepts a 9 to 32V input and handles both standard and smart variable-voltage alternators, with charge profiles for LiFePO4 lithium, AGM, gel, calcium and standard lead acid.

An MPPT solar regulator is built into the charger, with REDARC Green Power Priority. When solar is available it draws from the panel first and eases off the alternator, saving fuel and taking load off the vehicle. Add a solar blanket later and it plugs straight in, there is no second regulator to buy.

The mounting side is what makes this a kit rather than a box of parts. The REDARC BCDCMB-109 bracket in 304 stainless steel is pre-drilled for the Triton and positions the charger for engine bay airflow. The Hulk 4x4 DBT0321 tray is powder-coated steel and takes an N50 case battery. Everything bolts to factory mount points, with no drilling and no modifications. Six metres of 8 B&S twin core cable, midi fuses, holders, brackets, lugs, heat shrink and conduit are all in the box.

Suits the MQ and MR Triton 2.4L turbo diesel, 2019 onwards, automatic or manual.

The battery is not included. The tray is rated to a maximum battery of 255 x 174 x 220mm and 17kg. The batteries below sit slightly outside that. We fit this kit in our own workshop and have tested and confirmed they do go in, which is why we still recommend them.

For lead acid, the Century Dual Force+ 24X MF, 730CCA, 75Ah → is dual purpose, which suits a second battery that also needs to crank.

For AGM deep cycle there are two options. The Fullriver Deep Cycle AGM 85Ah → is built for repeated deep discharge, which is the pick if you are running a fridge for days at a time. The SSB HVT70D 12V 85Ah 620CCA Dry Cell AGM Deep-Cycle → is a sealed dry cell that handles vibration and heat well in an engine bay.

On lithium, the only lithium battery we will fit under a bonnet is the Invicta Xero, which is built to take engine bay temperatures. No other lithium belongs in an engine bay regardless of whether the case fits the tray.

The charger is solar-ready out of the box. To run a panel or blanket into it you will also need:

• 6mm twin core cable →
• SB50 Anderson plug →
• SB50 cover →
• Solar input bracket → Mounts the plug neatly in the engine bay.