1. Introduction
The QPKING BT30 OBD Power Supply Tool is designed to maintain the electrical power to your vehicle's Engine Control Unit (ECU) and other electronic systems while the main car battery is disconnected. This prevents the loss of critical data such as dashboard information, digital clock settings, radio presets, memory seat positions, and other system configurations during battery replacement or maintenance.
This device connects to your vehicle's OBD-II port and an external 12V power source, ensuring a continuous power supply to the vehicle's memory systems.

2. Setup and Connection
Follow these steps to properly set up and connect the BT30 tool:
- Prepare the Vehicle: Ensure the vehicle's ignition is off, and all accessories (lights, radio, air conditioning) are turned off. Remove the ignition key. This minimizes power draw and reduces the risk of blowing fuses.
- Prepare External Power Source: Obtain a fully charged 12V external battery (e.g., a spare car battery, motorcycle battery, or a jump starter with a 12V output). Ensure the voltage of the external battery is similar to your car's battery to prevent significant current flow.
- Connect to External Battery: Connect the red clamp of the BT30 tool to the positive (+) terminal of the external 12V power source. Connect the black clamp to the negative (-) terminal of the external 12V power source. Ensure a secure connection.
- Connect to Vehicle OBD-II Port: Locate your vehicle's OBD-II diagnostic port, typically found under the dashboard on the driver's side. Plug the BT30's OBD-II connector firmly into this port. A small indicator light on the OBD-II connector should illuminate, confirming power supply to the vehicle's ECU.
- Verify Power: After connecting, you may briefly check if the vehicle's internal systems (e.g., dashboard lights, clock) are still powered. If they are, the connection is successful.


3. Operating Instructions
Once the BT30 is correctly set up and providing power to your vehicle's systems, you can proceed with your main car battery replacement or maintenance tasks.
- Disconnect Main Car Battery: Carefully disconnect the negative (-) terminal, then the positive (+) terminal of your vehicle's main battery. Ensure the disconnected cables do not touch any metal parts of the vehicle.
- Perform Battery Service: Replace the old battery with a new one, or perform any necessary maintenance.
- Reconnect Main Car Battery: Connect the positive (+) terminal of the new battery first, then the negative (-) terminal. Ensure all connections are tight and secure.
- Disconnect BT30: Once the main car battery is fully reconnected, remove the BT30's OBD-II connector from the vehicle's port. Then, disconnect the clamps from the external 12V power source.
The BT30 helps preserve various vehicle data, including:
- Dashboard information
- Digital clock settings
- Radio presets and audio settings
- Memory seat positions
- Anti-lock Braking System (ABS) data
- Anti-slip system settings
- Electric rear mirror settings

4. Maintenance
To ensure the longevity and proper function of your QPKING BT30 tool:
- Storage: Store the tool in a dry, cool place away from direct sunlight and moisture.
- Cleaning: Wipe the tool with a dry, soft cloth after each use. Do not use harsh chemicals or abrasive cleaners.
- Cable Inspection: Regularly inspect the cables and clamps for any signs of wear, damage, or corrosion. Ensure the insulated clamps are intact.
- Fuse: The BT30 includes an inline fuse for protection. If the device stops working, check the fuse for continuity and replace it if necessary with a fuse of the same rating.

5. Troubleshooting
If you encounter issues while using the BT30, consider the following:
- No Indicator Light / No Power to Vehicle:
- Ensure the external 12V battery is fully charged.
- Verify that the clamps are securely connected to the correct terminals of the external battery (red to positive, black to negative).
- Check the OBD-II connector for a firm connection to the vehicle's port.
- Inspect the inline fuse. A blown fuse will interrupt power. Replace if necessary.
- Some OBD-II ports may only provide power on specific pins. Ensure the tool's internal wiring is intact.
- Vehicle Fuse Blows:
- Ensure all vehicle accessories (lights, radio, etc.) are turned off before connecting the BT30. Excessive current draw can blow the vehicle's OBD-II port fuse.
- Verify that the external battery voltage is compatible with the vehicle's system (typically 12V).
- Ensure the BT30's clamps are connected correctly to the external battery. Incorrect polarity can cause issues.
- Data Loss Occurs Despite Using Tool:
- Confirm the BT30's indicator light was on throughout the entire battery replacement process.
- Ensure the external 12V battery maintained sufficient charge during the process.
- Some older vehicles or specific systems may have volatile memory that requires a constant power source directly to the component, which the OBD-II port may not fully cover.
6. Specifications
| Model Name | BT30 |
| Brand | QPKING (Manufacturer: Autool) |
| Working Voltage | 12V |
| Working Current | 150mA |
| Cable Length | 80 cm (approximately 29.52 inches) |
| Product Length (OBD-II connector to clamps) | 750 mm / 29.52 inches |
| Item Weight | 3.52 ounces (145g) |
| Package Dimensions | 8.23 x 6.5 x 1.77 inches (200mm x 160mm x 30mm) |
| UPC | 712383648242, 712383648877 |

7. Warranty Information
Specific warranty details for the QPKING BT30 OBD Power Supply Tool are not provided in the available product information. Please refer to the retailer or manufacturer's official website for any applicable warranty terms and conditions.
8. Support
For further assistance or inquiries, you may visit the manufacturer's social media page: