1. Introduction
The DBPOWER Portable Car Jump Starter (Model DJS90) is a versatile and powerful device designed to provide emergency jump-starting for vehicles, as well as portable power for various electronic devices. With a peak current of 2000A and a capacity of 18000mAh, it is capable of starting vehicles with up to 7.2L gas or 5.5L diesel engines. Its compact design makes it easy to store and transport, ensuring you are prepared for unexpected battery issues.

Figure 1: DBPOWER Portable Car Jump Starter and included accessories.
2. Safety Information
Always read and understand all safety warnings and instructions before using this product. Failure to follow these instructions may result in electric shock, fire, and/or serious injury.
- Do not expose the product to rain or wet conditions.
- Do not operate the product in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust.
- Use only the intelligent jumper clamps provided with the product.
- Ensure proper polarity connection (+ to + and - to -) to avoid damage to the device or vehicle.
- Do not attempt to jump-start a frozen battery.
- Keep out of reach of children.
- Store the product in a cool, dry place away from direct sunlight.
- The intelligent jumper clamps feature over current protection, short circuit protection, overload protection, over-voltage protection, and over-charge protection for enhanced safety.

Figure 2: The DBPOWER Jump Starter includes multiple safety protections such as sparkproof, zero damage, low voltage, high temp, short-circuit, reverse polarity, over voltage, reverse charge, over current, and auto shutoff protection.
3. Setup
3.1 Unboxing and Initial Charge
Upon receiving your DBPOWER Jump Starter, carefully unbox all components. The package includes the jump starter unit, intelligent jumper clamps, a USB charging cable, a user guide, and a jump starter carry case.

Figure 3: Included items in the DBPOWER Jump Starter package.
Before first use, fully charge the jump starter. The LCD screen will indicate the remaining power. It is recommended to charge the unit to 100% for optimal performance.
3.2 Recharging the Jump Starter
The jump starter can be recharged using the provided USB charging cable. Connect the USB cable to a compatible USB power adapter (not included) or a car charger. The unit features a Type-C port that supports both charging and recharging, offering a 50% faster charging speed and reaching full charge in approximately 5 hours.

Figure 4: The jump starter can be conveniently recharged while driving using a car charger.
4. Operating Instructions
4.1 Jump Starting a Vehicle
The DBPOWER Jump Starter is designed to jump-start vehicles with up to 7.2L gas or 5.5L diesel engines. Ensure the jump starter is at least 50% charged before use.
- Connect the intelligent jumper clamps to the jump starter unit.
- Attach the red (positive) clamp to the positive (+) terminal of the vehicle's battery.
- Attach the black (negative) clamp to the negative (-) terminal of the vehicle's battery.
- Ensure the clamps are in correct status (the intelligent clamp indicator light will turn green).
- Start the vehicle.
- Once the vehicle starts, immediately remove the clamps from the battery terminals, starting with the negative (-) clamp, then the positive (+) clamp.

Figure 5: Visual guide for jump-starting your car.
4.2 Using as a Power Bank
With its 18000mAh capacity and smart USB port, the jump starter can charge smartphones, tablets, and other USB-powered devices at the fastest possible speed. Simply connect your device to the USB output port using a compatible USB cable.

Figure 6: The jump starter can charge various electronic devices multiple times on a single charge.
4.3 LED Flashlight Functionality
The unit features a built-in LED flashlight with four variable modes: Light, Strobe, SOS, and Emergency. This is useful for roadside emergencies or outdoor activities.
- Press the flashlight button once for constant light.
- Press again to cycle through Strobe, SOS, and Emergency modes.
- Press and hold to turn off the flashlight.

Figure 7: The LED flashlight offers multiple modes for different situations.
5. Maintenance
Proper maintenance ensures the longevity and optimal performance of your DBPOWER Jump Starter.
- Storage: Store the jump starter in its carry case in a cool, dry place when not in use. Avoid extreme temperatures. The unit is designed to withstand working temperatures from -4°F to 140°F.
- Recharging: For best results, recharge the unit every 3-6 months, even if it has not been used, to maintain battery health.
- Cleaning: Wipe the unit with a dry, soft cloth. Do not use harsh chemicals or abrasive materials.

Figure 8: The jump starter is built to perform in a wide range of temperatures.
6. Troubleshooting
If you encounter issues with your DBPOWER Jump Starter, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not turn on. | Battery is completely drained. | Charge the unit fully using the provided USB cable. |
| Vehicle does not start after connecting. | Incorrect clamp connection; battery too deeply discharged; engine size exceeds capacity. | Ensure clamps are connected correctly (red to +, black to -). Check jump starter's charge level. Verify vehicle engine size is within supported limits (7.2L gas, 5.5L diesel). |
| Intelligent clamp indicator light is not green. | Incorrect connection; short circuit; over-voltage. | Recheck connections. Ensure no metal parts are touching. If issues persist, contact customer support. |
| Device not charging when connected to USB. | Cable issue; power adapter issue; device not compatible. | Try a different USB cable or power adapter. Ensure your device is compatible with USB charging. |
For further assistance, please refer to the Warranty & Support section.
7. Specifications
- Brand: DBPOWER
- Model: DJS90
- Peak Current: 2000 Amps
- Battery Capacity: 18000mAh
- Engine Compatibility: Up to 7.2L Gas, 5.5L Diesel Engine
- Item Weight: 1.1 Pounds
- Product Dimensions: 7.28 x 1.57 x 3.54 inches
- Special Features: Smart Charging Port, LCD Screen, Compass, LED Light (4 modes), Multiple Protections (Over current, short circuit, overload, over-voltage, over-charge).
- Working Temperature: -4°F to 140°F
8. Warranty & Support
DBPOWER offers a 12-month hassle-free service and lifetime technical support for this product. If you have any questions or require assistance, please contact DBPOWER customer service. Refer to the product packaging or the official DBPOWER website for contact information.
For warranty activation and exclusive gifts, please visit the official DBPOWER website as instructed in the product packaging.





