YESPER 4120A YJS40 Jump Starter Instruction Manual

1. Introduction

The YESPER 4120A YJS40 Jump Starter is a portable, high-capacity device designed to jump start 12V vehicles. It features a 26800mAh battery, multiple charging ports, and integrated safety protections. This manual provides essential information for the safe and effective operation of your jump starter.

2. Package Contents

Verify that all items are present in your package:

• YJS40 Car Jump Starter
• Heavy-Duty Jumper Clamps
• USB to Type C Cable
• Cigarette Lighter Adapter
• Carrying Case
• User Manual

Image: The YESPER YJS40 Jump Starter and its accessories, including jumper cables, USB-C cable, cigarette lighter adapter, and carrying case.

3. Product Overview

The YJS40 features a robust design with clear indicators and multiple ports for versatile use.

Image: A detailed view of the YESPER YJS40 Jump Starter highlighting its LED indicator, power button, LED flashlight, In/Out Type-C port, Quick Charging Output, DC15V/10A output, and Jumper Cable Socket.

• LED Indicator: Displays battery charge level.
• Power On Button: Activates the device and controls the LED flashlight.
• LED Flashlight: Provides illumination with multiple modes.
• In/Out Type-C (5V/3A): Used for charging the jump starter and powering other devices.
• USB QC (5/9/12V) Output: Quick charging port for compatible devices.
• USB (5V/2.4A) Output: Standard USB output for charging devices.
• DC (15V/10A) Output: Powers 12V DC devices like tire inflators or car vacuum cleaners.
• Jumper Cable Socket: Connects the heavy-duty jumper clamps.

4. Charging the Jump Starter

Before first use, fully charge the jump starter. It is recommended to keep the device charged above 50% for optimal performance.

• Connect the USB to Type C cable to the jump starter's In/Out Type-C port.
• Connect the other end of the USB cable to a suitable USB wall adapter (not included) or the provided cigarette lighter adapter for in-car charging.
• The LED indicator lights will illuminate to show the charging progress.

5. Operating Instructions: Jump Starting a Vehicle

The YJS40 can safely jump start 12V vehicles (up to ALL gasoline and 10.0-liter diesel engines).

1. Ensure the jump starter has at least 50% charge.
2. Connect the heavy-duty jumper clamps to the jump starter's socket.
3. Attach the red (positive) clamp to the positive (+) terminal of the vehicle battery.
4. Attach the black (negative) clamp to the negative (-) terminal of the vehicle battery or a suitable ground point on the vehicle chassis.
5. If the vehicle battery is extremely low or dead, press the 'BOOST' button on the jumper cable for 2-3 seconds until the indicator light turns green. This provides maximum power for starting in cold conditions.
6. Start the vehicle.
7. Once the vehicle starts, immediately remove the jumper clamps from the vehicle battery, then disconnect them from the jump starter.

Image: The YESPER YJS40 Jump Starter connected to a car battery with jumper clamps, showing the 'BOOST' button and indicator lights.

Video: A demonstration of the YESPER YJS40 Jump Starter successfully starting various 12V gas engines, including cars and trucks.

6. Additional Functions

6.1 Power Bank Functionality

The 26800mAh battery capacity allows the YJS40 to serve as a portable power bank for various electronic devices.

• Use the USB QC (5/9/12V) or USB (5V/2.4A) output ports to charge smartphones, tablets, and other USB-powered devices.
• The DC (15V/10A) output port can power 12V DC devices such as tire inflators, car vacuum cleaners, or car refrigerators.

Image: The YESPER YJS40 Jump Starter connected via USB cables to charge a smartphone and a tablet, demonstrating its power bank capability.

Image: The YESPER YJS40 Jump Starter connected to and powering a tire inflator and a car vacuum cleaner, showcasing its multi-function DC interface.

6.2 LED Flashlight

The built-in 400-lumen LED flashlight offers three modes for various situations:

• Flashlight Mode: For general illumination.
• Strobe Light Mode: For signaling or attracting attention.
• SOS Light Mode: For emergency signaling.

Image: The YESPER YJS40 Jump Starter's 400-lumen LED flashlight illuminated, with icons indicating Flashlight, Strobe, and SOS modes.

7. Safety Features

The YJS40 is equipped with DSLI IV Intelligent Control Technology and 10 safety protection features to ensure safe operation:

• Overcharge Protection
• Over-Discharge Protection
• Over-Temperature Protection
• Anti-Charge Protection
• Over-Voltage Protection
• Over-Current Protection
• AI Software Protection
• Reverse Polarity Protection
• Short Circuit Protection
• Low Self-Consumption Protection

Image: An internal view of the YESPER YJS40 Jump Starter's circuitry, illustrating the 10 safety protection features including overcharge, over-discharge, over-temperature, anti-charge, over-voltage, over-current, AI software, reverse polarity, short circuit, and low self-consumption protection.

8. Care and Maintenance

• Store the jump starter in a cool, dry place, away from direct sunlight and moisture.
• Recharge the device every 3-6 months to maintain battery health, even if not used.
• Clean the device with a dry, soft cloth. Do not use harsh chemicals or abrasive materials.
• Avoid dropping or subjecting the device to strong impacts.

9. Troubleshooting

• Device not turning on: Ensure the device is charged. If fully charged, contact support.
• Vehicle not starting: Check that the jumper clamps are correctly connected to the battery terminals. Ensure the jump starter has sufficient charge. If the 'BOOST' function is needed, activate it as per instructions.
• Error indicators: Refer to the user manual for specific error codes displayed on the device's screen.

10. Technical Specifications

11. Warranty and Support

YESPER provides comprehensive customer support for its products.

• Replacement Service: Enjoy 365 days of replacement service.
• After-sales Support: Lifetime after-sales support is available.
• Online Response: 24-hour online response for any questions or concerns.

For further assistance, please visit the official YESPER website: www.yesperpower.com