Hard Korr Heavy Duty Battery Box with Voltage-Sensitive Relay (VSR)


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This heavy-duty battery box allows you to turn a regular deep-cycle battery into an easy-to-use power station or create a dual battery set-up using the inbuilt 50A Voltage-Sensitive Relay (VSR). The easiest way to create a deal battery setup in your own vehicle! High quality, long-lasting. You get two 12v outlets with 10A fuses, a dual USB outlet, four 50A Anderson-style outlets (used as outputs or inputs), and a 175A Anderson-style outlet which can be used as a jump-starter. All Anderson-style ports are recessed into the body to minimize potential damage. Internal cabling uses heavy-gauge wire and quality connectors. Charge using solar & more by plugging into one of the 50A ports or directly from the vehicle’s crank battery using the VSR. The battery’s charge status and voltage can be easily seen on the large digital display.

Dimensions are as follows:
Description 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 the battery voltage drops below 12.7V, the VSR automatically cuts the link between the auxiliary and crank batteries.
Warranty 5 Year
Box Dimension 17.9″ L x 9.4″ H
Max battery weight 77LB
Suitable for all deep-cycle batteries up to 330mm (L) x 180mm (W) x 240mm (H)
Charge via CSR or Anderson plug input
Outputs/Inputs 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 10-50 Degrees Celsius
Total Product Weight 7.4LB
Product includes Heavy-duty battery box, set bolts, brackets & Allen keys
  • This battery box works with a wide range of batteries including AGM, Lithium, Gel, Calcium & Wet
  • Constructed from UL 94V-0 compliant ABS plastic
  • Multiple port types Connect DC/DC charger or solar panel for charging.
  • Can jump-start vehicles All ports recessed into the body
  • Large digital display


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