Heavy Duty Battery Box with Voltage-Sensitive Relay (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 dual-battery setup using the inbuilt VSR. It is suitable for all deep-cycle batteries up to 330mm (l) x 180mm (w) x 240mm (h) in size.

Hard Korr Lighting offers free shipping Australia wide on orders over $100Hard Korr Lighting offers a 2 year warranty on this productHard Korr Lighting offers 30 days free returns

PLEASE NOTE: Our Users Manual states that this product comes with a 5V USB to 12V DC adaptor cable. This is a misprint and will be corrected in future production runs. We apologise for any confusion this may cause.

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 12.9″ (L) x 7″ (W) x 9.4″ (H), 330mm (L) x 180mm (W) x 240mm (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 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 and a 30-day money back guarantee.


Materials ABS plastic (UL 94V-0 compliant)
Box dimensions 17.9″(L) x 9.4″(W) x 12.9″(H)
455mm(L) x 240mm(W) x 330mm(H)
Max. battery dimensions 12.9″(L) x 7″(W) x 9.4″(H)
330mm(L) x 180mm(W) x 240mm(H)
Max. battery weight 77lb 35.0kg
Suitable battery types Deep cycle (Lithium, AGM, Calcium, Wet, Gel)
Charge method via VSR or Anderson plug input
Ports 1 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
VSR Voltage Cut-offs 13.2V (engage), 12.7V (disengage)
VSR Cut-off Delay 10 seconds
Operating temperature -10°C to 50°C
Weight 3.4kg 7.4lb

Pack Contents

1x Heavy duty battery box
1x set bolts, brackets & Allen keys
1x Strap


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