1. Introduction
Thank you for choosing the YESPER 1500A Portable Car Jump Starter, Model JS-377. This compact and powerful device is designed to jump-start various vehicles, including cars, motorcycles, trucks, ATVs, boats, RVs, vans, SUVs, and tractors. It also functions as a portable power bank for charging electronic devices and includes a built-in flashlight. This manual provides essential information for safe and effective use, setup, operation, maintenance, and troubleshooting.
2. Important Safety Information
Read 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 operate the jump starter if it has been damaged or modified.
- Do not jump-start a frozen battery.
- Do not connect the positive (+) and negative (-) clamps together.
- Do not allow children to operate the jump starter.
- Ensure proper ventilation during use.
- Wear eye protection and gloves when working with batteries.
- Keep the jump starter away from moisture and flammable materials.
- Disconnect the smart jumper cables from the jump starter when not in use.
- The device is equipped with DSLI IV Safe Tech and 10 protections, including spark-proof and reverse polarity protection. However, always exercise caution.
3. Package Contents
Verify that all items are present in your package:
- YESPER 1500A Portable Car Jump Starter Unit
- Smart Jumper Cables with Clamps
- USB-C Charging Cable
- User Manual
Image: Package contents of the YESPER 1500A Portable Car Jump Starter.
4. Product Overview
4.1 Key Features
- Compact and Lightweight: Designed for portability, easily fitting into a pocket or small storage space.
- Powerful Performance: Delivers 1500 amps peak current, capable of starting up to 7.0L gas and 5.5L diesel engines.
- Advanced Safety: Features DSLI IV Safe Tech with 10 protections, including spark-proof and reverse polarity protection, over-temperature, short circuit, overcharge, over-discharge, anti-charge, low self-consumption, AI software, overvoltage, and overcurrent protection.
- Multi-functional Power Bank: Equipped with a fast-charging USB output port (5V/2.1A) to charge mobile phones, tablets, laptops, and other USB devices.
- Boost Function: Enables starting a completely dead car battery by providing a forced start.
- Integrated Flashlight: Provides illumination for nighttime or low-light situations.
4.2 Components
The YESPER JS-377 includes the main jump starter unit and smart jumper cables. The unit features a power button, LED indicators for battery level, USB-C input for charging, and USB-A output for device charging. The smart jumper cables have a connector for the unit and red/black clamps for the vehicle battery terminals, along with a 'BOOST' button and indicator lights.
Image: Detail of the 'BOOST' button and smart cable connector.
Image: Overview of the 10 safety protections.
5. Setup
5.1 Initial Charge
Before first use, fully charge the YESPER jump starter. Connect the provided USB-C charging cable to the unit's USB-C input port and plug the other end into a suitable USB power adapter (not included). The LED indicators will show the charging progress. A full charge is indicated when all LEDs are solid.
Image: Charging the jump starter and using it as a power bank.
5.2 Connecting Smart Jumper Cables
Ensure the jump starter is turned off. Insert the blue end of the smart jumper cable connector firmly into the jump starter's designated port. Ensure a secure connection before proceeding to jump-start a vehicle.
Video: Demonstrates plugging the smart jumper cable into the YESPER ARMOR MINI jump starter unit.
6. Operating Instructions
6.1 Jump Starting a Vehicle
- Connect: Ensure the jump starter is adequately charged. Plug the smart jumper cables into the jump starter. Connect the red (+) clamp to the positive terminal of the vehicle battery and the black (-) clamp to the negative terminal.
- Ready: Observe the indicator light on the smart jumper cable. A solid green light indicates a correct connection and that the unit is ready to start. If the light is red or flashing, check connections and battery voltage.
- Go: Once the green light is solid, start your car engine. If the engine does not start immediately, wait 30 seconds before attempting again.
- Disconnect: After the vehicle starts, immediately remove the clamps from the vehicle battery, then disconnect the smart jumper cables from the jump starter.
Image: Three-step process for jump starting a vehicle.
Video: Demonstrates the compact size and ease of use of the YESPER ARMOR MINI jump starter.
6.2 Using the BOOST Function
If your vehicle battery is completely dead (below 2V) and the smart cable does not show a green light, you can use the BOOST function. After connecting the clamps to the battery terminals, press and hold the 'BOOST' button on the smart jumper cable for 3 seconds until the green light turns solid. Then, start your vehicle within 30 seconds. This function bypasses some safety checks and should only be used when necessary and with extreme caution.
Image: Jump starter connected to a car battery.
6.3 Charging Electronic Devices
Connect your USB-powered device to the USB-A output port (5V/2.1A) on the jump starter using your device's charging cable. The jump starter will automatically begin charging your device. The LED indicators will show the remaining battery level of the jump starter.
6.4 Using the Flashlight
Press and hold the power button on the jump starter unit for 3 seconds to turn on the flashlight. Press the button again to cycle through different light modes (e.g., solid, strobe, SOS). Press and hold the power button again to turn off the flashlight.
Image: Using the integrated flashlight.
7. Maintenance
- Recharge Regularly: To maintain optimal battery health, recharge the jump starter every 3-6 months, even if not used. This ensures it is ready when needed and prolongs its lifespan.
- Storage: Store the jump starter in a cool, dry place, away from direct sunlight and extreme temperatures (recommended operating temperature: -4°F to 140°F / -20°C to 60°C).
- Cleaning: Clean the unit with a dry, soft cloth. Do not use harsh chemicals or abrasive materials.
- Cable Care: Inspect the smart jumper cables and clamps for any damage before each use. Replace if frayed or broken.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Vehicle does not start | Jump starter battery is low; Incorrect clamp connection; Vehicle battery completely dead; Vehicle issue unrelated to battery. | Recharge jump starter; Ensure correct polarity and secure connection; Use BOOST function for completely dead batteries; Consult a mechanic if the issue persists. |
| Smart cable indicator is red/flashing | Reverse polarity; Short circuit; Over-temperature; Low voltage of vehicle battery. | Check clamp connections for correct polarity; Disconnect and allow to cool if overheating; Use BOOST function if vehicle battery is very low. |
| Jump starter not charging devices | Jump starter battery is low; Incorrect cable; Device not compatible. | Recharge jump starter; Use original or certified USB cable; Ensure device is compatible with 5V/2.1A output. |
| Jump starter not charging | Faulty USB-C cable or power adapter; Unit damage. | Try a different USB-C cable and power adapter; Contact customer support if the issue persists. |
9. Specifications
| Feature | Detail |
|---|---|
| Brand | YESPER |
| Model Number | JS-377 (Armor mini) |
| Peak Output Current | 1500 A |
| Battery Capacity | 12000 mAh |
| Battery Cell Composition | Polymer |
| Voltage | 12 Volts |
| Product Dimensions (D x W x H) | 0.93" x 2.99" x 5.82" (2.36 cm x 7.59 cm x 14.78 cm) |
| Item Weight | 310 g |
| Vehicle Service Type Compatibility | ATV, Bus, Lawn Mower, Motorcycle, Passenger Car, RV, Snowmobile, UTV, Van (Up to 7L Gas and 5.5L Diesel Engine) |
| USB Output | 5V/2.1A |
| Operating Temperature | -4°F to 140°F (-20°C to 60°C) |
| Safety Certifications | UL Compliant |
10. Warranty and Support
10.1 Product Warranty
The YESPER 1500A Portable Car Jump Starter (Model JS-377) comes with an 18-month product care warranty from the date of purchase. This warranty covers manufacturing defects and ensures reliable performance under normal use. Please retain your proof of purchase for warranty claims.
Image: 18-month product care warranty.
10.2 Customer Support
For technical assistance, warranty claims, or any questions regarding your YESPER product, please contact our customer support team. Refer to the contact information provided in the original product packaging or on the official YESPER website.
