The Ultimate Guide to the Remote Control Battery Disconnect Switch

The 12V/24V 240A Automatic Disconnect ON-OFF Remote Control Battery Disconnect Switch is a crucial component for maintaining the health and longevity of your vehicle's battery. Despite its popularity, many customers have questions and doubts about its features and functionality. This guide aims to address these concerns and provide a comprehensive understanding of this innovative product.

(3D Video)

Why You Need a Battery Disconnect Switch?

Battery disconnect switches are essential for several reasons:

  • Preventing Battery Drain: When a vehicle is parked for extended periods, the battery can drain due to parasitic loads from electronic systems.
  • Enhanced Safety: In case of an electrical fault, a disconnect switch can quickly cut off the power, preventing potential hazards.
  • Convenience: Easily disconnect the battery when performing maintenance or repairs, ensuring no accidental power surges.
  • Extended Battery Life: Reduces wear and tear on the battery, prolonging its lifespan.


This remote battery disconnect switch boasts impressive specifications, including:

  • Rated Current: 240A
  • Rated Voltage: 12V/24V
  • Standby Power Consumption: Just 1-3mA
  • Power-off Thresholds: 11.8V±0.2V / 23±0.2V
  • Instantaneous Current Handling: Up to 500A

These specifications ensure that the switch is both powerful and efficient, capable of handling high currents while consuming minimal power in standby mode.

Features and Benefits

  • Magnetic Latching Function

The switch employs a magnetic latching relay for circuit control, resulting in a minimal standby current of 3mA. This innovative design is highly energy-efficient compared to conventional methods, making it an excellent choice for conserving battery power.

  • Automatic Cut Off

To protect your battery, this switch is designed to automatically cut power when the voltage drops below 11.8V/23V. It delays the power cut for 120 seconds to save electricity. If the voltage exceeds 13.2V/25V, the remote control is temporarily disabled to prevent accidental power disruption while driving, ensuring control via the switch’s button.

  • Battery Protection

By using this car battery kill switch, you can prevent power loss due to long-term parking, eliminate electronic equipment issues, prevent wiring degradation, and avoid accidentally leaving lights on. This results in effective battery protection and an extended battery life.

(Remote Battery Disconnect Switch Performance at Different Voltages)

Installation and Usage

Installation Steps:

  1. Turn off the power before installation for safety.
  2. Connect the switch to the negative terminal for added stability.
  3. Mount the switch securely in your desired location.

Safety Precautions:

  • Ensure all connections are secure.
  • Regularly check the switch for any signs of wear or damage.

Usage Tips:

  • Use the remote control within the specified range. (433MHz remote typically has a range of around 30 meters/100 feet)
  • Monitor battery voltage regularly to ensure optimal performance.
(Wire Diagram)

Frequently Asked Questions (FAQ)

Q1: Why doesn’t it work above 13.3 volts when most car alternators charge at 14.5 volts?

A: The battery disconnect switch controls the battery, not the alternator. The switch is designed to temporarily disable the remote control function when the battery voltage exceeds 13.3 volts. This is a safety feature to prevent accidental disconnection while driving. The switch itself continues to function normally. Once the battery voltage returns to a normal level, the wireless remote control function will resume, allowing you to control the battery switch again.

To further illustrate how the switch works, we've created a short video demonstration.

    Q2: Can this be mounted on the starter to keep the battery and car connected while disconnecting the starter?

    A: While we understand the intention behind this request, this specific battery disconnect switch is designed for battery isolation and might not be the ideal solution for directly disconnecting the starter.

    • Designed for Battery Isolation: The switch is primarily intended to cut off power to the battery, and its voltage/current handling capabilities are optimized for that purpose. Directly mounting it to the starter might not be compatible with the starter's electrical requirements.

    • Alternative Applications: This switch can be used to interrupt power to other circuits for theft deterrence. For instance, you could wire it to cut off the fuel pump, starter solenoid power wire, or neutral safety switch. However, we strongly recommend consulting with a qualified automotive electrician before attempting any modifications to your vehicle's electrical system.

    Q3: Will this battery disconnect switch reset the car's computer or radio every time it is turned off and back on?

    A: It's important to note that most cars have a single main battery, and disconnecting this battery will reset the car's computer and radio. However, some vehicles may have a second battery that acts as a backup power source to preserve data if the main battery fails.

    **We strongly recommend checking your car's manual to determine if your specific model has a second battery. **

    Q4: What is the average range of the remote control? 

    A: This 433MHz remote typically has a range of around 30 meters (100 feet).

    Q5: I bought two of these and they both require reprogramming the remote after installation. There's no reset button on the device. What can I do?

    A: It sounds like you might have missed the reprogramming instructions included with the device. We understand the frustration of needing to reprogram the remote, but it's a necessary step to ensure proper communication between the remote and the switch.

    You can find detailed instructions on how to reprogram the remote in the user manual, which is available here: RL-240A-RCM2 Manuals

    Please review these instructions carefully, and let us know if you have any further questions or need additional assistance.


      The 12V/24V 240A Automatic Disconnect ON-OFF Remote Control Battery Disconnect Switch is a reliable and efficient solution for battery management. Its advanced features and benefits make it a valuable addition to any vehicle. If you have any further questions, please feel free to contact us for more information.

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