Heavy Duty Battery Box With Voltage-Sensitive Relay (VSR)


Our heavy duty battery box allows you to turn a regular deep-cycle battery into a convenient portable power station or create a dual-battery setup using the inbuilt VSR. It is suitable for all deep-cycle batteries up to 330mm x 175mm x 220mm and up to 130Ah.

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(3 customer reviews)

$299.00 $199.00

or 4 fortnightly payments of $49.75 with

Frequently bought together:

Dual Battery Wiring Kit (for Battery Box with VSR)

175A Jump Start Leads (for Battery Box with VSR)

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Our heavy duty battery box allows you to turn a regular deep-cycle battery into a convenient portable power station, or create a simple dual battery setup using the inbuilt 50A Voltage-Sensitive Relay (VSR). It is suitable for a range of battery types including AGM, Lithium, Wet, Gel and Calcium, and can handle batteries up to 330mm (l) x 75mm (w) x 220mm (h) in size.

Constructed of durable ABS plastic and meeting the UL 94V-0 standard for flammability of plastic products, this battery box is a high-quality unit that will last for many years. It contains two 12v outlets with 10A fuses, a dual USB outlet, four 50A Anderson-style outlets that can be used as outputs or inputs (one reserved for VSR input), and a 175A Anderson-style outlet which can be used as a jump-starter. Unlike most other models on the market, all Anderson-style ports are recessed into the body to minimise the possibility of damage, and the internal cabling uses heavy-gauge wire and quality connectors.

The battery can be charged from a range of sources (including solar panels) by simply plugging into one of the 50A Anderson-style ports, or directly from the vehicle’s crank battery using the VSR. The battery’s charge status and voltage can be easily seen via the large digital display.

This battery box has dual USB outputs This battery box has dual cig outputs This battery box has four Anderson inputs/outputs

Key features

  • Constructed from UL 94V-0 compliant ABS plastic
  • Multiple port types allows your to connect a range of devices
  • Easily connect a DC/DC charger or solar panel to charge the battery, or use the inbuilt VSR to charge directly from crank battery
  • Can be used to jump start vehicles (175A Anderson jumper cable set is an optional extra)
  • All ports are recessed into the body to reduce likelihood of damage
  • Easily see battery status with large digital display

Ready-Made Dual Battery Setup

Using a battery box with inbuilt VSR is the easiest way to create a dual battery setup in your vehicle.

The inbuilt VSR acts as an isolator, allowing the auxiliary battery (inside the box) to charge directly from the crank battery while the car is running. When the ignition is switched off and battery voltage drops below 12.7V, the VSR automatically cuts the link between the auxiliary and crank batteries.

The optional wiring kit makes it an easy DIY job to install your dual battery setup.

The Hard Korr® Guarantee

All Hard Korr® products are manufactured using the highest quality materials. We are confident that they are the most durable in the market and will give you many years of reliable service. We stand behind this product with a comprehensive 2-year Australian warranty and a 30-day money back guarantee.


MaterialsABS plastic (UL 94V-0 compliant)
Box dimensions455mm (l) x 240mm (w) x 330mm (h)
Max. battery dimensions330mm (l) x 180mm (w) x 240mm (h)
Max. battery weight35.0kg
Max. battery capacity130Ah
Suitable battery typesDeep cycle (Lithium, AGM, Calcium, Wet, Gel)
Charge methodvia VSR or Anderson plug input
Ports1 x dual USB output
2 x cigarette plug outputs
1 x 50A VSR input (black Anderson plug)
3 x 50A Anderson plug inputs/outputs
1 x 175A Anderson plug output
Operating temperature-10°C to 50°C

Pack Contents

1xHeavy duty battery box
1xset bolts, brackets & Allen keys
1x5V USB to 12V DC converter cable

3 reviews for Heavy Duty Battery Box With Voltage-Sensitive Relay (VSR)

  1. mattmurray2711

    Had one of these battery boxes for a few months now seems to work really well although i haven’t used the inbulit VSR as I did not receive the cable for the connection to the car or the jump leads, works well with a 130Ah battery ran my 65L fridge at -1 for almost 4 days no worries, works well with 150W solar blanket i use to charge the battery

  2. Numb Thumbs

    This is a brilliant battery box! It easily holds my 125 Ah lithium battery plus my Ctek D250sDual DC/DC-Solar charger which I have mounted under the lid with room to spare. I have set it up with an alternator input, solar input and two outputs on the 50 Amp Anderson plugs and I use the 175 Anderson plug to power my compressor which draws around 100 Amps.
    The box is very neat and tidy and the ABS construction is very tough and will not short out any stray wires.
    It is a great product and I would not hesitate to recommend it.

  3. Matt

    I’m very happy with this battery box. I’ve got a 120ah lithium in it connected to my alternator for charging using the built in VSR. It works just as it’s should. It cuts in very shortly after I start my ute and cuts out at 12.7v. You do have to make sure that the battery box switch is in the on position for it to charge which isn’t a problem as long as you are aware of it. As the display lights up from your car battery even in the off position it is NOT charging your second battery unless the switch is on. I didn’t pick up on this until the second day ( not too smart ). I use the 175amp Anderson plug output for my 1500watt inverter which works great. I have already shown a couple of friends who will now be getting them as well.

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