1. Introduction and Overview
The UTRAI JS-8 Car Jump Starter Power Bank is a powerful and versatile device designed for emergency vehicle starting and portable charging of electronic devices. With a robust 6000A peak current and a 20000mAh (74Wh) battery capacity, it can reliably start a wide range of 12V vehicles. It also functions as a portable power bank and features a multi-mode LED flashlight for various situations.
This manual provides essential information on how to safely and effectively use, maintain, and troubleshoot your UTRAI JS-8 device.

Figure 1: UTRAI JS-8 Jump Starter with Smart Clamps
2. Safety Information
Your safety is paramount. The UTRAI JS-8 is equipped with multiple safety features to ensure reliable operation. Please read and understand all safety warnings before use.
- NTC Protection: Prevents overcharge, overdischarge, overcurrent, and overheating, extending service life and improving safety.
- ABS Shell: Constructed from PC+ABS UL94-V0 flame retardant material, offering high standards of fire-resistance and impact resistance.
- Smart Clamps: Feature an advanced safety protection system including overload protection, over-current protection, and over-voltage protection. They are designed to prevent sparks during connection.

Figure 2: All-Round Safety Features

Figure 3: Super-safe Smart Clamp Protection
3. Package Contents
Please check the package contents upon receipt. If any items are missing or damaged, contact customer support.
- UTRAI JS-8 Jump Starter Unit
- Smart Battery Clamps (Red and Black)
- USB-C Charging Cable
- User Manual
- Storage Bag

Figure 4: Packing List
4. Specifications

Figure 5: Product Parameters
| Feature | Specification |
|---|---|
| Model | JS-8 |
| Battery Capacity | 20000mAh (74Wh) |
| Peak Current | 6000A |
| Jump Start Output | 12V |
| Gas Engine Rating | Up to 10.0L |
| Diesel Engine Rating | Up to 8.0L |
| USB-C Input | 5V/3A, 9V/2A, 12V/1.5A |
| USB Output 1 | 5V/3A, 9V/2A, 12V/1.5A |
| USB Output 2 | 5V/2.1A |
| Charging Time | 8-10 hours |
| Unit Size (L*W*H) | 255mm x 93mm x 37mm |
| Item Weight | 815g |
| Cycle Life | 1000 Times |
| Charge Work Temperature | 0℃ ~ 45℃ |
| Discharge Work Temperature | -20℃ ~ 60℃ |
| Special Features | USB, Lighting, Cigarette Lighter Starter, Warning Light, SOS Lighting |
| Certifications | RoHS, pse, FCC, CE |

Figure 6: Engine Compatibility
5. Setup Instructions
Before using the jump starter, ensure it is fully charged. The 3.3-inch display will show the battery percentage.
5.1 Component Identification

Figure 7: Device Layout
- Red Battery Clamp: Connects to the positive (+) terminal of the car battery.
- Black Battery Clamp: Connects to the negative (-) terminal of the car battery.
- LED Indicators: On the smart clamp, indicate connection status.
- Battery Clamp Plug: Connects the smart clamps to the jump starter's EC5 output port.
- Power Button: To turn the device on/off and cycle through LED light modes.
- Display Screen: Shows battery percentage, charge/recharge status, and temperature alarms.
- USB Output Port 1: For fast charging devices (5V/3A, 9V/2A, 12V/1.5A).
- USB Output Port 2: For standard charging devices (5V/2.1A).
- USB-C Input Port: For charging the jump starter itself.
- LED Light: Multi-mode flashlight.
- EC5 Output Port: For connecting the smart battery clamps.
6. Operating Instructions
6.1 Jump Starting a Vehicle
Follow these steps to safely jump start your 12V vehicle:
- Connect Smart Clamps: Plug the smart clamp cable into the EC5 output port of the jump starter. Ensure the LED indicator on the smart clamp turns green, indicating it's ready.
- Attach to Car Battery: Open your vehicle's hood. Connect the red (+) clamp to the positive terminal of your car battery and the black (-) clamp to the negative terminal.
- Start Vehicle: Return to your vehicle and start the engine.
- Disconnect: Once the vehicle starts, immediately remove the smart clamps from the car battery, then unplug the smart clamp cable from the jump starter.

Figure 8: 3 Steps to Start Your Vehicle
Video 1: Demonstrating the UTRAI JS-8 Jump Starter in action.
6.2 Using as a Power Bank
The JS-8 can charge your electronic devices on the go.
- Connect Device: Use a compatible USB cable to connect your device (phone, tablet, smartwatch, camera, drone, etc.) to either USB Output Port 1 or USB Output Port 2.
- Charging: For faster charging, use USB Output Port 1 (supports 5V/3A, 9V/2A, 12V/1.5A). USB Output Port 2 provides 5V/2.1A.
- Monitor: The display screen will show the charging status and remaining battery percentage.

Figure 9: Power-Ups on the Go
6.3 LED Flashlight Function
The built-in LED light offers three modes for various emergency and utility needs:
- Normal Light: Press the Power Button once to turn on the steady flashlight.
- Strobe Light: Press the Power Button again to switch to strobe mode.
- SOS Signal: Press the Power Button a third time to activate the SOS flashing signal.
- Turn Off: Press the Power Button a fourth time to turn off the LED light.
The flashlight provides 300 lumens of brightness.

Figure 10: 3-Mode Bright LED Light
7. Charging the Device
To charge your UTRAI JS-8 jump starter:
- Connect Charger: Use the provided USB-C charging cable and a compatible USB wall adapter (not included) to connect the jump starter's USB-C Input Port to a power source.
- Monitor Display: The 3.3-inch clear display will show the charging status and current battery percentage.
- Charging Time: A full charge typically takes 8-10 hours.

Figure 11: Informative Display
8. Maintenance
- Regular Charging: To prolong battery life, charge the JS-8 jump starter every 3 months, even if not in use.
- Storage: Store the device in a cool, dry place, away from direct sunlight and extreme temperatures.
- Cleaning: Use a soft, dry cloth to clean the exterior of the device. Do not use harsh chemicals or abrasive materials.
- Avoid Water: Keep the device away from water and moisture.
9. Troubleshooting
If you encounter issues with your UTRAI JS-8, refer to the following common problems and solutions:
- Device Not Turning On: Ensure the device is charged. If the battery is depleted, charge it fully.
- Car Not Starting:
- Check that the smart clamps are securely connected to the jump starter's EC5 port.
- Verify that the red clamp is connected to the positive (+) terminal and the black clamp to the negative (-) terminal of the car battery.
- Ensure the smart clamp's LED indicator is green. If it's red or flashing, refer to the smart clamp's specific error codes (if available in the full manual) or try re-connecting.
- Confirm your vehicle's engine size is within the JS-8's rated capacity (Gas up to 10.0L, Diesel up to 8.0L).
- Device Not Charging:
- Ensure the USB-C cable is properly connected to both the jump starter and the power adapter.
- Try a different USB-C cable or power adapter.
- Verify the power source is active.
- Overheating: The device has NTC protection. If it feels excessively hot, disconnect it immediately and allow it to cool down before further use. The display may show a temperature alarm.

Figure 12: Common Car Starting Problems and Solutions
10. User Tips
- Pre-charge for Emergencies: Always ensure your jump starter is fully charged before long trips or if you anticipate needing it.
- Regular Check-ups: Periodically check the battery level on the display, especially if the device has been stored for a while.
- Optimal Performance: For best results, use the jump starter within its recommended operating temperature range (-20℃ to 60℃ for discharge, 0℃ to 45℃ for charge).
- Fast Charging: When charging external devices, use USB Output Port 1 for quicker charging speeds if your device supports it.
11. Frequently Asked Questions (FAQ)
- Q: What vehicles can this jump starter be used for?
- A: The UTRAI JS-8 is designed to start 12V vehicles, including gas engines up to 10.0L and diesel engines up to 8.0L. This covers a wide range of vehicles such as cars, SUVs, pick-ups, vans, off-road vehicles, RVs, motorcycles, snowmobiles, and lawnmowers.
- Q: How long does it take to charge the jump starter?
- A: A full charge for the JS-8 typically takes 8-10 hours using the USB-C input port.
- Q: How often should I charge the jump starter if not in use?
- A: It is highly recommended to charge the device every 3 months to maintain optimal battery health and ensure it's ready for use when needed.
- Q: What safety features does it have?
- A: The JS-8 includes NTC protection against overcharge, overdischarge, overcurrent, and overheating. It also features an ABS fireproof shell and smart clamps with multiple built-in protections to prevent sparks and ensure safe operation.
- Q: Does this jump starter have an internal battery?
- A: Yes, the UTRAI JS-8 is a power bank jump starter and contains a 20000mAh (74Wh) internal lithium battery.
12. Warranty and Support
The UTRAI JS-8 Car Jump Starter Power Bank comes with a One Year Warranty from the date of purchase. Additionally, the product is backed by a 365 Days Free Replacement policy for manufacturing defects.
For technical support, warranty claims, or any questions regarding your device, please contact the seller or manufacturer's customer service through the platform where you purchased the product.





