1. Introduction
Thank you for choosing the BOOKOO H9 Car Battery Jumper Starter. This portable device is designed to safely and quickly jump-start dead vehicle batteries, provide portable power for your electronic devices, and offer emergency lighting. Please read this manual thoroughly before use to ensure proper operation and to maximize the lifespan of your device.
2. Safety Information
WARNING: Always follow these safety guidelines to prevent injury or damage to the device and vehicle.
- Ensure the jump starter has at least 25% charge before attempting to jump-start a vehicle.
- Do not connect the positive (+) and negative (-) clamps together.
- Do not immerse the unit in water.
- Do not expose the unit to extreme temperatures.
- Keep out of reach of children.
- The device features 10 intelligent protections including reverse polarity, reverse charge, over-discharge, reverse connection, short circuit, over-charge, over-current, over-heat, and spark resistance. However, always exercise caution.
3. Package Contents
Verify that all items are present in your package:
- BOOKOO H9 Car Jump Starter (x1)
- Smart Jumper Cables (x1)
- Cigarette Lighter Converter (x1)
- USB-A to C Cable (x1) (Note: Adapter not included)
- Carrying Case (x1)
- User Manual (x1)

Text Description: An image showing the BOOKOO H9 jump starter, smart jumper cables, cigarette lighter converter, USB-A to C cable, and a carrying case, laid out on a surface.
4. Product Overview
The BOOKOO H9 is a versatile device combining a powerful jump starter, a portable power bank, and an emergency light.
4.1 Key Features
- Powerful Jump Starting: 4000A peak current, capable of starting up to 10.0L gas and 8.0L diesel engines.
- Portable Power Bank: 20000mAh capacity with QC3.0 fast charging and multiple output ports.
- Emergency Light: 400 lumens LED light with stable, strobe, and SOS modes.
- DC Output: 12-16V/6A DC port for powering 12V vehicle-mounted devices.
- Advanced Protections: 10 intelligent safety features for spark-free and damage-free operation.

Text Description: A red and black BOOKOO H9 jump starter with its smart clamps connected to a car battery. Text overlays indicate "SAFELY & QUICKLY START YOUR DEAD BATTERIES" and specifications like "4000A Peak", "10.0L Gas", and "8.0L Diesel".

Text Description: The BOOKOO H9 jump starter is shown on a wooden table, charging two smartphones. Text indicates "74Wh PORTABLE POWER BANK" and highlights various output ports: Input, Output 1, Output 2 (QC3.0), and DC.

Text Description: The BOOKOO H9 jump starter is connected via its DC output port to a car air compressor, with a car tire visible in the background. Text states "12~16V/6A DC OUTPUT" and mentions powering car devices.

Text Description: A close-up of the BOOKOO H9 jump starter's end, with a bright light beam emanating from its flashlight. Icons for Flashlight, SOS, and Strobe are shown, along with the text "400 LUMENS EMERGENCY LIGHT".

Text Description: A close-up of the red and black smart jumper cable clamps, with text indicating "10 ADVANCED PROTECTIONS" and "NO Sparks & NO Damage". A shield icon with "10 PROTECTIONS" is also visible.
5. Setup
5.1 Charging the Jump Starter
- Connect the provided USB-A to C cable to the jump starter's input port.
- Connect the other end of the USB-A to C cable to a suitable USB wall adapter (not included) or car charger.
- The LED indicator lights on the jump starter will illuminate to show the charging status. All lights will be solid when fully charged.
- For optimal performance, ensure the jump starter is fully charged before its first use.
6. Operating Instructions
6.1 Jump Starting a Vehicle
- Ensure the jump starter has at least 25% charge.
- Connect the red (+) clamp of the smart jumper cables to the positive (+) terminal of the vehicle's dead battery.
- Connect the black (-) clamp of the smart jumper cables to the negative (-) terminal of the vehicle's dead battery.
- Ensure the clamps are securely attached and there is good contact.
- Turn on the jump starter. The indicator on the smart cable will show readiness.
- Start your vehicle's engine.
- Once the vehicle starts, immediately remove the smart jumper cables from the jump starter, then disconnect the clamps from the car battery (negative first, then positive).
6.2 Using as a Portable Power Bank
- Connect your electronic device (e.g., smartphone, tablet) to one of the USB output ports (Output 1 or Output 2 QC3.0) on the jump starter using an appropriate USB cable.
- The jump starter will automatically begin charging your device.
6.3 Using the Emergency Light
- Press and hold the power button for a few seconds to turn on the LED flashlight.
- Press the power button briefly to cycle through the light modes: Stable > Strobe > SOS > Off.
6.4 Using the DC Output
- Connect the cigarette lighter converter to the DC output port on the jump starter.
- Plug your 12V vehicle-mounted device (e.g., air compressor, vacuum cleaner) into the cigarette lighter converter.
- Ensure the jump starter is powered on to provide power to the connected device.
7. Maintenance
7.1 Charging and Storage
- To maintain battery health, it is recommended to charge the jump starter every 2-3 months, especially if not used for a long time.
- Store the device in its carrying case in a cool, dry place, away from direct sunlight and extreme temperatures.
- Keep the ports clean and free from dust and debris.
8. Troubleshooting
8.1 Common Issues and Solutions
| Problem | Possible Cause | Solution |
|---|---|---|
| Vehicle does not start | Jump starter battery low (<25%) | Recharge the jump starter to at least 25% before attempting to start. |
| Vehicle does not start | Clamps not properly connected | Ensure clamps are securely attached to the correct battery terminals. |
| Smart cables show error/no indicator | Reverse polarity, short circuit, or other protection triggered | Check connections for correct polarity. Disconnect and reconnect clamps. If issue persists, consult customer service. |
| Device not charging | Faulty cable or adapter | Try a different USB-C cable and a different USB wall adapter. |
9. Specifications
| Feature | Detail |
|---|---|
| Model | H9 |
| Brand | BOOKOO (XMSJ) |
| Peak Current | 4000 A |
| Engine Compatibility | Up to 10.0L Gas, 8.0L Diesel |
| Battery Capacity | 20000mAh (74Wh) |
| DC Output | 12-16V / 6A |
| LED Emergency Light | 400 Lumens (Flashlight, SOS, Strobe) |
| Weight | 1.56 pounds |
| Dimensions (Approx.) | 6.8 x [Width] x 1.5 inches (compact size) |
| Protections | 10 intelligent protections (reverse polarity, reverse charge, over-discharge, reverse connection, short circuit, over-charge, over-current, over-heat, spark resistance) |
10. User Tips
- Always keep the jump starter charged above 25% for reliable emergency use.
- Regularly check the charge level, especially before long trips or storing the device for extended periods.
- Utilize the carrying case to protect the device from wear and damage when not in use.
11. Warranty and Support
The BOOKOO H9 Car Battery Jumper Starter is covered by a 12-month warranty from the date of purchase. If you encounter any issues or have questions regarding your device, please contact our customer service for assistance. Please have your purchase details ready when contacting support.





