Yesper 4120 Car Jumpstarter Battery Booster User Manual

1. Introduction

Thank you for choosing the Yesper 4120 Car Jumpstarter. This powerful and versatile device is designed to jump-start vehicles with dead batteries, serve as a portable power bank for electronic devices, and provide emergency lighting. With its robust design and multiple safety features, the Yesper 4120 is an essential tool for any driver.

2. What's in the Box

Please check the package contents upon receipt:

• Yesper 4120 Jump Starter Unit
• Smart Jumper Clamps (Red and Black)
• USB-C Charging Cable
• 12V DC Adapter
• Carrying Case

3. Specifications

4. Safety Information

The Yesper 4120 is equipped with 10 protection features to ensure safe operation:

• Over-current protection
• Over-charge protection
• Short circuit protection
• Reverse charge protection
• Over-discharge protection
• Reverse polarity protection
• Over temperature protection
• Reverse connection protection
• AI software protection
• Low self-consumption protection

Always follow these general safety guidelines:

• Do not immerse the unit in water.
• Do not expose the unit to extreme temperatures or direct sunlight for prolonged periods.
• Do not disassemble or modify the unit.
• Keep out of reach of children.
• Use only the provided smart jumper clamps.
• Ensure proper ventilation during use and charging.

5. Setup and Charging

5.1 Initial Charge

Before first use, fully charge the Yesper 4120 Jump Starter. Connect the 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) or a 12V DC adapter.

• The digital screen will indicate the charging status.
• A full charge typically takes 8-9 hours.

5.2 Recharging Frequency

We recommend recharging the Yesper 4120 Jump Starter every 3 months to maintain optimal battery health, even if not in use.

6. Operating Instructions

6.1 Jump-Starting a Vehicle

1. Ensure the jump starter is sufficiently charged (at least 50% recommended).
2. Turn off the vehicle's ignition and all accessories.
3. Connect the red (+) clamp of the smart jumper cable to the positive (+) terminal of the vehicle's battery.
4. Connect the black (-) clamp of the smart jumper cable to the negative (-) terminal of the vehicle's battery.
5. Connect the smart jumper cable's blue plug into the jump starter's output port.
6. Check the indicator on the jumper cable:
• A steady green light indicates a correct connection.
• A steady red light with a beeping sound indicates a reversed connection. Disconnect and re-connect correctly.
7. Once the green light is steady, start the vehicle's engine.
8. After the vehicle starts, immediately disconnect the smart jumper cable from the jump starter, then disconnect the clamps from the vehicle battery (black first, then red).

Demonstration of the Yesper Jump Starter in various emergency scenarios.

6.2 Using as a Power Bank

The Yesper 4120 features multiple output ports for charging electronic devices:

• USB-C Output (5V/3A): For devices compatible with USB-C charging.
• Quick Charge 3.0 (5V/2.4A; 9V/2A; 12V/1.5A): For fast charging compatible smartphones and tablets.
• USB-A Output (5V/2.4A): Standard USB output for various devices.
• DC Output (15V/10A): For powering 12V DC appliances like tire inflators or car vacuums.

Simply connect your device to the appropriate output port using its charging cable. The digital screen will show the remaining battery level.

6.3 Using the LED Light

The built-in 400 Lumens LED light has three modes:

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

Press the power button briefly to cycle through the light modes.

7. Maintenance

• Store the jump starter in its carrying case in a cool, dry place when not in use.
• Avoid dropping the unit or exposing it to harsh impacts.
• Clean the exterior with a soft, damp cloth. Do not use harsh chemicals or abrasives.
• Ensure the ports are free from dust and debris.
• Recharge the unit every 3 months to prolong battery life.

8. Troubleshooting

Q: The jump starter does not turn on.

A: Ensure the unit is charged. If the battery is completely depleted, it may take a few minutes of charging before the unit responds.

Q: The vehicle does not start after connecting the jump starter.

A: Check the smart jumper cable indicator for a steady green light. If it's red or beeping, re-check the connections to the battery terminals. Ensure the vehicle's battery terminals are clean and free of corrosion. The vehicle's battery might be severely damaged or the issue might not be battery-related.

Q: The smart jumper cable indicator shows a red light and beeps.

A: This indicates a reverse polarity connection. Disconnect the clamps from the vehicle battery and re-connect them correctly: red to positive (+), black to negative (-).

Q: The jump starter is not charging my phone/device.

A: Ensure the jump starter has sufficient charge. Check that the charging cable is securely connected to both the jump starter and your device. Try a different USB port or cable.

9. User Tips

• For optimal performance, especially in cold weather, ensure your Yesper 4120 is fully charged before use.
• Keep the jump starter in your vehicle for emergencies, but store it in a place where it won't be exposed to direct sunlight or extreme heat for extended periods.
• Always double-check the polarity when connecting the clamps to avoid damage to the jump starter or your vehicle. The smart clamps provide a visual and audible warning for incorrect connections.
• The 15V DC output is very useful for powering other car accessories like portable air compressors or vacuum cleaners, making it a versatile tool beyond just jump-starting.

10. Warranty and Support

The Yesper 4120 Jump Starter comes with a 12-month warranty. For any technical support, warranty claims, or inquiries, please contact the seller or Yesper customer service through the platform where you purchased the product.