Introduction
This manual provides essential instructions for the safe and effective use of your Onerbl 2-Prong AC Charging Cord. This cord is designed as a replacement for specific EverStart MAXX Jump Starter models, including J309, J309ES, and J5C09E. Please read this manual thoroughly before use and retain it for future reference.
Product Overview
The Onerbl 2-Prong AC Charging Cord is a power supply cable designed to connect compatible EverStart MAXX Jump Starters to a standard electrical outlet for charging. It converts AC power from the wall outlet into the DC power required by your device.

Image: The Onerbl 2-Prong AC Charging Cord. This image displays the black power cord, coiled, with a standard two-prong AC plug on one end and a C7 (figure-8) connector on the other end.
Safety Information
- Ensure the charging cord is compatible with your device's power requirements before use.
- Do not use the cord if it is damaged, frayed, or has exposed wires.
- Avoid placing the cord in areas where it can be tripped over or damaged.
- Keep the cord away from water and excessive heat.
- Unplug the cord from the power outlet when not in use or during electrical storms.
Setup
- Inspect the Cord: Before first use, carefully inspect the entire length of the Onerbl 2-Prong AC Charging Cord for any signs of damage, cuts, or fraying. Do not use if damaged.
- Identify Ports: Locate the AC input port on your EverStart MAXX Jump Starter. This port is typically labeled for AC input or charging.
- Connect to Device: Insert the C7 (figure-8) connector end of the Onerbl charging cord firmly into the AC input port of your EverStart MAXX Jump Starter.
- Connect to Power Outlet: Insert the 2-prong AC plug end of the charging cord into a standard, grounded 120V AC electrical wall outlet.
Ensure both connections are secure before proceeding to operation.
Operating Instructions
Once the Onerbl 2-Prong AC Charging Cord is properly connected to both your EverStart MAXX Jump Starter and a power outlet, the jump starter should begin charging. Refer to your jump starter's specific instruction manual for details on charging indicators and expected charging times.
- Charging Indication: Most EverStart MAXX models have LED indicators that show charging status (e.g., charging, fully charged). Monitor these indicators.
- Charging Duration: Charge your jump starter for the duration recommended by its manufacturer. Overcharging can reduce battery life.
- Disconnecting: Once charging is complete, first unplug the 2-prong AC plug from the wall outlet, then disconnect the C7 connector from the jump starter.
Maintenance
- Cleaning: Keep the cord clean and free from dust and debris. Use a dry, soft cloth for cleaning. Do not use liquid cleaners.
- Storage: When not in use, coil the cord loosely and store it in a cool, dry place, away from direct sunlight and extreme temperatures. Avoid tight coiling or kinking, which can damage the internal wires.
- Regular Inspection: Periodically inspect the cord for any signs of wear, damage, or loose connections. Replace the cord immediately if any damage is observed.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Jump starter not charging. | Cord not properly connected. | Ensure both ends of the cord are securely plugged in. |
| Wall outlet is not active. | Test the wall outlet with another device. | |
| Cord is damaged. | Inspect the cord for damage. Replace if necessary. | |
| Cord feels warm during charging. | Normal operation. | A slight warmth is normal. If it becomes excessively hot or emits smoke/smell, discontinue use immediately and unplug. |
Specifications
- Product Type: 2-Prong AC Charging Cord
- Compatibility: EverStart MAXX Jump Starter Models J309, J309ES, J5C09E (and similar models requiring a 2-prong AC input)
- Input Connector: NEMA 1-15P (2-prong AC plug)
- Output Connector: IEC C7 (figure-8)
- Voltage: 120V AC (standard household)
- Brand: Onerbl
- Manufacturer: Shenzhen Waweis Technology Co., Ltd
Warranty and Support
For warranty information or technical support regarding your Onerbl 2-Prong AC Charging Cord, please refer to the documentation provided at the time of purchase or contact the seller directly. Keep your purchase receipt as proof of purchase.
Manufacturer: Shenzhen Waweis Technology Co., Ltd
Brand: Onerbl