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AUTOOL BT30 ECU Emergency Power Supply Cable Includes 3A Fuse
US$29.00
Key Features
- Digital Display
- Insulated Cable
- 3A Fuse Guard
- Digital Display: The built-in display lets users observe voltage and current changes during operation instead of working blind.
- Insulated Cable: The insulated, fully enclosed cable design is described to reduce electrical leakage risk and improve handling comfort.
- 3A Fuse Guard: A built-in 3A fuse is included to help protect the device and vehicle ECU during a circuit fault.
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AUTOOL BT30
Product Overview
The AUTOOL BT30 ECU Emergency Power Supply Cable is an OBD emergency power cable designed to keep the vehicle ECU and electronic systems powered during battery replacement. It helps prevent data loss, reset issues, and electronic setting loss while allowing users to observe real-time voltage and current changes through the built-in high-definition digital display.
ECU Power Supply Voltage Display Current Display 3A Fuse
10-14VOperating Voltage
<7AOperating Current
-20°C~60°COperating Temp
3 YearsWarranty
Click to enlargeKey Features
Key Features
BT30 combines OBD emergency power support, voltage and current display, leakage detection assistance, insulated clamps, and fuse protection for safer battery replacement and electrical observation.
ECU Emergency Power Supply
During vehicle battery replacement, BT30 supplies backup power through the OBD interface to help keep the ECU and vehicle electronic systems powered.
Voltage And Current Display
The high-definition digital display makes it easier to observe voltage and current changes while the device is operating.
Leakage Detection Support
After connecting an external 12V battery and disconnecting the original vehicle battery negative terminal, the current display can help observe vehicle static current and possible leakage current.
Built-In 3A Fuse Protection
The built-in 3A fuse helps prevent damage to the device and vehicle ECU when abnormal current passes through the circuit.
Multiple Electrical Protections
BT30 supports overcurrent protection, overvoltage protection, and reverse polarity protection to reduce risks caused by circuit faults or incorrect connection.
Insulated Clamp And Cable
The insulated cable, fully enclosed clamp design, pure copper clamp teeth, and thickened spring improve grip stability and safer handling.
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Click to enlargeSpecifications
Specifications
Review the BT30 operating voltage, operating current, temperature range, interface, fuse, cable length, and structure before use.
| Product Information | |
| Product | AUTOOL BT30 ECU Emergency Power Supply Cable |
| Product Type | OBD emergency power cable for battery replacement and leakage detection support |
| Main Function | Maintains ECU and vehicle electronic system power during battery replacement |
| Display | Voltage display and current display |
| Electrical Parameters | |
| Operating Voltage | 10-14V |
| Operating Current | <7A |
| Fuse | Built-in 3A fuse |
| Replacement Fuse | 3A or 5A fuse only; do not use a fuse larger than 5A |
| Operating Temperature | -20°C~60°C |
| Structure | |
| Interface | OBD interface |
| Clamp | Power clamp with insulated cable |
| Power Switch | Built-in ON / OFF switch |
| Cable Length | 0.5m clamp side + 0.4m OBD side |
| Main Unit Size Reference | 102mm height / 48mm width shown in the specification image |
Click to enlargeProduct Information
ProductAUTOOL BT30 ECU Emergency Power Supply Cable
Product TypeOBD emergency power cable for battery replacement and leakage detection support
Main FunctionMaintains ECU and vehicle electronic system power during battery replacement
DisplayVoltage display and current display
Electrical Parameters
Operating Voltage10-14V
Operating Current<7A
FuseBuilt-in 3A fuse
Replacement Fuse3A or 5A fuse only; do not use a fuse larger than 5A
Operating Temperature-20°C~60°C
Structure
InterfaceOBD interface
ClampPower clamp with insulated cable
Power SwitchBuilt-in ON / OFF switch
Cable Length0.5m clamp side + 0.4m OBD side
Main Unit Size Reference102mm height / 48mm width shown in the specification image
Click to enlargeHow To Use
How To Use
Use a fully charged 12V spare battery and connect BT30 correctly before removing the original vehicle battery. Keep the vehicle power switch OFF during the operation.
Prepare A Fully-Charged 12V Spare Battery
Prepare a fully charged 12V battery before replacing the vehicle battery. Do not use a low-voltage battery as the backup power source.
Connect The Power Clamp
Connect the red clamp to the positive terminal and the black clamp to the negative terminal. After correct connection, the screen displays voltage data.
Connect The OBD Interface
Connect the BT30 OBD interface to the vehicle OBD port. After the OBD connection is successful, the screen can display current data under the correct test condition.
Replace The Vehicle Battery
Remove the old battery and install the new battery while BT30 keeps power supplied through the OBD connection.
Use Notes
- During battery replacement, keep the vehicle power switch OFF and avoid turning on electrical appliances.
- Before use, keep the car key at least 3 meters away from the vehicle to prevent wake-up current and high-current alarm.
- For current display / leakage detection, after connecting the external 12V battery, disconnect the negative terminal of the original vehicle battery.
- If the device alarms immediately, check whether the backup battery voltage is too low and replace it with a battery above 12V.
Product Comparison
Product Comparison
The new BT30 improves the original ECU power supply function by adding display, leakage observation, electrical protection, and insulation upgrades.
Old VersionBasic ECU power supply only
New VersionAdds leakage detection, voltage display, current display, overcurrent protection, overvoltage protection, reverse polarity protection, and insulation material
Decision CheckChoose the new BT30 if you need visible voltage/current monitoring, static current observation, and stronger circuit protection during battery replacement
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Click to enlargeWhat Is In The Box
What Is In The Box
The packing list uses one most relevant package image only, showing the BT30 product box, user manual, and main OBD emergency power cable.
Main UnitAUTOOL BT30 OBD emergency power cable
Cable / ClampIntegrated power clamp and OBD interface
DisplayVoltage and current digital display
ProtectionBuilt-in 3A fuse
DocumentationUser manual
PackagingProduct box shown in the image
Manual And Downloads
Manual And Downloads
Download the AUTOOL BT30 user manual for product overview, features, technical parameters, structure, battery replacement, leakage detection, maintenance, and warranty information.
Click to enlargeAUTOOL BT30 User Manual
Open the PDF manual for BT30 OBD emergency power cable setup, battery replacement support, leakage detection, and fuse guidance.
Download ManualNeed Setup Confirmation?
Contact AUTOOL Store before use if you need to confirm battery replacement operation, current display conditions, fuse replacement, alarm troubleshooting, or no-power troubleshooting.
Before You Order And Use
Before You Order And Use
Review the battery, sleep mode, key distance, current display, fuse replacement, and storage requirements before using BT30.
Use And Safety Notes
- Use a fully charged 12V spare battery.
- Do not use a low-voltage battery; if the device alarms immediately, replace it with a battery above 12V.
- Do not use a jump starter or power bank charger as the power source; use a vehicle battery.
- During battery replacement, keep the vehicle power switch OFF and do not turn on electrical appliances.
- Keep the car key at least 3 meters away from the vehicle before use to prevent wake-up current and high-current alarm.
- For current display / leakage detection, disconnect the negative terminal of the original vehicle battery after connecting the external 12V battery.
- If the fuse blows, replace it with a 3A or 5A fuse only.
- Do not use a fuse larger than 5A; it may damage the vehicle fuse or computer motherboard.
- Store the product in a dry place and avoid hot, humid, or non-ventilated storage.
Questions And Answers
These answers cover fuse blowing, alarm triggers, no current display, fuse replacement, low battery voltage alarms, and no-power issues after connecting to a battery.
Before use, make sure the vehicle is in sleep mode and keep the car key at least 3 meters away from the vehicle. This helps prevent the high-current alarm from being triggered. The fuse on BT30 will only blow when high current passes through the device.
After connecting an external 12V battery, disconnect the negative terminal of the original vehicle battery. This allows the load current to be displayed.
Replace the fuse with a 3A or 5A fuse, which can usually be found at a repair shop. Do not use a fuse larger than 5A because an oversized fuse may damage the vehicle’s original fuse or the vehicle computer motherboard.
The beeping alarm may occur because the battery voltage is too low. Replace the battery with one that has a voltage greater than 12V.
Check whether the connected battery is a vehicle battery. If a jump starter or power bank charger is connected, the device will not power on. Replace it with a vehicle battery for proper power supply.
Warranty And Contact
Warranty And Contact
For product support, manual requests, battery replacement operation confirmation, leakage detection setup, current display troubleshooting, fuse replacement, alarm troubleshooting, or no-power troubleshooting, contact AUTOOL Store directly.
Pre-Sales And Product Support
Use support if you need help confirming the correct 12V battery source, connection steps, current display condition, fuse size, alarm cause, no-power issue, or battery replacement workflow before using BT30.
- 3-year warranty for eligible non-human damage cases
- Lifetime maintenance support
- Manual request and setup confirmation
- Fuse replacement and alarm troubleshooting
- No current display and no power troubleshooting
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