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Adventure Kings 138Ah Battery Box + Adventure Kings 20AMP DC-DC Charger

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Adventure Kings 138Ah Battery Box + Adventure Kings 20AMP DC-DC Charger

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  • 2x USB Charging Ports + 1x Cig Socket

  • Connect Solar Panels, Battery Chargers & More

  • 20A Multi-Stage Battery Charger

  • ETFO Charging Technology

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Adventure Kings Maxi Battery Box


You asked for it, so we’ve delivered! You can now buy an Adventure Kings Maxi Battery Box big enough to fit in the insane Adventure Kings 138Ah AGM Deep-Cycle Battery!

If you’re looking for the ultimate in camping 12v power, then look no further than the Adventure Kings 138Ah AGM Deep-Cycle Battery. With a simply monster capacity, it can run your camp fridge, LED lights, phones and more for ages when you’re camping.

And now available, is the Adventure Kings Maxi Battery Box, designed to perfectly house the Adventure Kings 138Ah Battery. It has all the same features you know and love from the regular sized Adventure Kings Battery Box, like multiple power outlets, sockets and terminals, as well as an inbuilt LED voltmeter to keep an eye on your battery, and an isolator switch to isolate your deep-cycle battery from the rest of your 12v system.

It instantly turns your Adventure Kings 138Ah battery into a true portable power hub! Underneath the lid it’s completely pre-wired, with all fuses to keep your gear safe. Just connect the cabling to your battery’s positive and negative posts and you’re ready to go!

It measures in at 470mm long, by 310mm high, by 220mm deep, and will fit any deep-cycle battery up to 425mm wide, 240mm high, and 185mm deep. This adjustable internal bracket allows you to also secure a smaller battery if you wish.

The Adventure Kings Maxi Battery Box is made from ultra-strong polypropylene and features a strong tie-down strap for locating and securing the lid.

Plug your Adventure Kings solar panel and regulator straight into the quick-connect fittings for charging power anytime the sun is out, or wire it into any Adventure Kings 12v Battery Charger or Isolator to charge your battery while you drive.

Whether you’ve already got an Adventure Kings 138Ah AGM Deep Cycle Battery, or you pair one with your new Maxi Battery Box you’re just about to pick up, you’ll have the ultimate portable power hub for any off-road adventure. Available exclusively from 4WD Supacentre!

Adventure Kings 20AMP DC-DC Charger

Meet the new King of DCDC charging! The Adventure Kings 20A DCDC charger.

Designed, engineered and tested in Australia and developed over the last five years – this DCDC charger is ready to take your 12V dual battery system to the next level.

Built to withstand extreme heat and harsh vibrations, The Adventure Kings DCDC charger uses industrial grade components made in Japan and the USA from companies including Panasonic, Texas Instruments and Linear Technologies. It’s been designed, prototyped, tested, revised and improved for over a year before being launched. Prior to that, earlier evolutions have been on the market for around 5 years. To say this is high quality is an understatement, we’re confident it’s one of the best DCDC chargers on the market.

Everything from wiring up the first prototypes to designing circuit boards and even overseeing production and quality control was performed by an Aussie based Engineering and R+D company – Intelliquip Solutions. With multiple decades of experience in the electronics and engineering fields, as well as being 4WDers and campers themselves, Intelliquip Solutions were the perfect team to lead up this project. Along with the research, development and testing team at Adventure Kings we’re all incredibly excited to launch this high quality and innovative bit of gear onto the market.

These are all the reasons that the Adventure Kings DCDC charger is a winner:

-          DESIGNED, TESTED AND ENGINEERED IN AUSTRALIA – Every step of development was achieved in-house in Australia, including writing over 10,000 lines of coding, designing the unique circuit boards and housings, dozens of stages of prototypes, component selection and all the laboratory and real world testing.

-          EXTREME TEMPERATURE, FULL OUTPUT (ETFO) CHARGING TECHNOLOGY – Adventure Kings DCDC Chargers can output their stated 20Amps of charge even in constant, extremely hot ambient temperatures of up to 60°C* and internal temperatures around 90°C*

-          TRUE MULTI-STAGE VARIABLE CHARGING – Able to input from 11.9-25V and vary output voltage and current this is a buck/boost converter that takes advantage of sophisticated charging profiles and curves. Over 10,000 lines of coding were written in house to ensure excellent charging across the board

-          RECOVERS SERIOUSLY DISCHARGED BATTERIES – If the Adventure Kings DCDC charger detects over 5V it will attempt to charge and revive the battery. This is a much lower value than many other chargers and could save you hundreds rather than having to buy another battery on the off chance you discharge it too much!

-          INDUSTRIAL GRADE COMPONENTS – Industrial grade components are a step above commercial grade and are rated to suit higher working temperatures

-          MULTI CHEMISTRY BATTERY SELECTION – Suitable for Flooded Lead Acid / GEL, Calcium and AGM deep cycle batteries

-          SMART ALTERNATOR MODE – Adjust voltage cut off and isolator function with the smart alternator mode to suit modern vehicles or for use in trailers and caravans

-          LED INDICATOR LIGHTS – Shows connections, charging status and any error codes through dual colour LEDs

-          DOUBLE INTERNAL TEMPERATURE SENSOR – Reporting back to the charging chip, two temperature sensors monitor different parts of the circuit board and electronics to protect and regulate the unit for high efficiency and longevity

-          EXTERNAL BATTERY TERMINAL MOUNTED TEMPERATURE PROBE – Rather than resting against the battery or using ambient temperature, the Adventure Kings DCDC charger always uses an accurate and precise reading of the actual battery temperature for safe and effective charging every time.

-          BUILT-IN PROTECTIONS – Properly protected against reverse polarity, short circuiting, under/over voltage, over current as well as over temperature and battery under/over temperature.

-          TOUGH ALUMINIUM HOUSING – Will survive harsh conditions and engineered with built in heat sink for excellent passive cooling

-          TESTED ACROSS AUSTRALIA – With more than 5 years of heritage and over 12 months of testing on this design alone, the Adventure Kings DCDC charger has been tested across Australia from East to West as well as in the lab in extreme heat and cold.

-          ULTRASONICALLY SOLDERED, SOLID COPPER LUGS – We’ve innovated a new way to mount high-current wires to circuit boards for the ideal electrical connection and so it’s rugged enough to take on Australian off-road conditions.

-          HEAVY DUTY, HIGH QUALITY WIRING – All approved for electronics use and approved by the underwriters laboratory USA

*tested under lab conditions by IntelliQuip Solutions.


Adventure Kings Maxi Battery Box

  • 2 x USB ports
  • 1 x Cig Socket
  • Positive and negative terminals
  • 2 x Anderson Style Plugs
  • Digital Voltage Indicator
  • Resettable Circuit Breaker
  • Lid Strap
  • External Dimensions:

    470mm (L) x 310mm (H) x 220mm (D)

    Maximum Battery Size:

    425mm (L) x 240mm (H) x 185mm (D)



    Weight (without battery):


    Adventure Kings 20AMP DC-DC Charger

    Max. Charging Current:

    20A (multi-stage, buck/boost charging)

    Vehicle Input Voltage Range:

    11.9 -  25V

    Min. Input start-up Voltage - Vehicle:


    Vehicle Input Voltage Range (Ign wire NOT fitted):

    12.8 – 25V

    Min. Input start-up Voltage - Vehicle (Ign Wire NOT fitted):


    Min. Aux Battery Voltage:


    Max. Charging Voltage / Current at 25°C:

    Wet lead Acid 14.2V/25A, AGM 14.6V/25A, Calcium 15.3V/25A

    Idle Current Draw:


    Operation Temperature - Aux Battery:

    -10 °C - 50 °C


    142mm x 125.6mm x 33.5mm



    Temperature Compensation:


    Temperature Sensor(s):

    Yes , two internal, one external with ring terminal for accurate battery temperature 


    Powder coated aluminium

    LED Indicator lights:

    Yes - for status, connections and errors

    Battery Chemistry Selection:

    Yes - AGM, wet lead acid/gel, calcium

    Fuses required:

    Yes – not supplied (50A suggested)

    Recommended wire size:

    Up to 8m – 6 AWG.     8-15m – 4 AWG

    Adventure Kings 138Ah Battery Box + Adventure Kings 20AMP DC-DC Charger

    Adventure Kings Maxi Battery Box

    Adventure Kings 20AMP DC-DC Charger

    Additional Information

    Manuals and Documentation No