1. Introduction
The FOXSUR Smart Car Battery Charger (Model: FBC122408D) is a fully automatic pulse repair battery charger designed for 12V and 24V lead-acid batteries. It features intelligent microprocessor control, multiple protection mechanisms, and an LCD display for monitoring charging status. This charger is suitable for various vehicles including cars, trucks, motorcycles, RVs, and boats, and is compatible with Calcium, Gel, AGM, Wet, and EFB battery types.

Figure 1: FOXSUR Smart Car Battery Charger (Model: FBC122408D)
Video 1: Overview of FOXSUR Smart Car Battery Charger features, including touch keys, silent fan, repair function, winter/summer mode, multiple charging modes, and intelligent digital display.
2. Safety Warnings
- Always read instructions before use.
- Do not open the charger casing.
- Use in a well-ventilated area during charging.
- Do not expose to direct sunlight.
- Disconnect from main power supply before altering battery connections.
- Ensure proper polarity connection: Red clamp to positive (+), Black clamp to negative (-).
- This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
3. Specifications

Figure 2: Product Parameters and Dimensions
| Attribute | Value |
|---|---|
| Brand Name | FOXSUR |
| Model | FBC122408D |
| Material | ABS flame retardant |
| AC Input | 100 - 240V 50/60Hz |
| Rated Output | 12V 8A / 24V 4A |
| Output Voltage Range | DC 14.6V - 29.2V |
| Output Peak Current | 8A |
| Minimum Start Voltage | 2.0V |
| Battery Capacity Range | 6AH ~ 150AH |
| Compatible Battery Types | Lead-acid Batteries (AGM, GEL, SLA, WET, EFB) |
| Switchmode Technology | Yes |
| Cooling | Fan |
| Thermal Protection | 65°C +/- 5°C |
| Efficiency | App. 85% |
| Dimensions (L×W×H) | 170mm × 98mm × 58mm |
| Item Weight | 590g |
| Output Line Length | 65cm |
| Input Line Length | 110cm |
| Approval | CE, FCC, UKCA |
Note: Lithium batteries are not charged by this device.
4. Package Contents
The package typically includes:
- 1 x FOXSUR Smart Car Battery Charger (Model: FBC122408D)
- 1 x User Manual (this document)
- Battery clamps (red for positive, black for negative)
- Power cord (with appropriate plug type: EU, US, UK, AU adapter)
5. Setup and Connection
Before connecting the charger, ensure the battery is clean and free of corrosion. Always connect the battery clamps to the battery terminals before plugging the charger into the power outlet.

Figure 3: Connection Steps for 12V and 24V Batteries
5.1. For 12V Batteries:
- Plug the charger into the household 230V power supply.
- Select the corresponding mode (e.g., Car/Truck, Motorcycle, AGM, GEL).
- Red clamp connects the positive pole (+) of the battery.
- Black clamp clips the negative electrode (-) of the battery.
- Start charging.
5.2. For 24V Batteries:
- Connect two 12V batteries in series.
- Plug the charger into the household 220V power supply.
- Select the corresponding mode.
- Red clamp clamps the positive pole (+) of the battery.
- Black clamp clips the negative electrode (-) of the battery.
- Start charging.
Important:
- Ensure secure connections to prevent sparks.
- The charger features non-battery link protection and reverse connection protection for safety.
6. Operating Modes
The FOXSUR charger offers multiple charging modes, easily switchable with a single touch button. The intelligent digital display provides real-time information.

Figure 4: Multiple Charging Modes
- Car/Truck Mode: Standard charging for automotive and truck batteries.
- AGM Mode: Optimized charging for Absorbent Glass Mat (AGM) batteries.
- Motorcycle Mode: Lower current charging suitable for motorcycle batteries.
- Repair Mode: Utilizes high and low frequency pulse repair technology to help restore drained and sulfated batteries, extending battery life. Note: This mode cannot activate completely dead batteries or fully repair severely damaged ones.

Figure 5: Touch Button for Mode Switching
7. Charging Process and Display
The charger employs a 3-stage automatic charging process to prevent overcharging and can be left connected indefinitely. The intelligent LCD display provides comprehensive feedback:

Figure 6: LCD Charge Display
- Current: Displays the charging current (e.g., 8.0A).
- Temperature: Shows the ambient temperature (e.g., 25°C).
- Voltage: Indicates the battery voltage (e.g., 13.8V).
- Battery Level: Graphic representation of the battery's charge percentage (20%, 40%, 60%, 80%, 100%).
- Status Indicators: Icons for Car/Truck, AGM, Motorcycle, Repair modes, and full protection.
7.1. Automatic Temperature Detection (Winter/Summer Mode):
The charger automatically detects the ambient temperature and adjusts the charging voltage accordingly to optimize charging performance and prevent over or undercharging in extreme conditions.

Figure 7: Automatic Temperature Compensation
8. Maintenance
- Keep the charger clean and dry. Wipe with a soft, dry cloth.
- Store the charger in a cool, dry place when not in use.
- Regularly inspect the cables and clamps for any damage. Replace if necessary.
- Ensure the cooling fan is not obstructed to maintain optimal performance and prevent overheating.

Figure 8: Super Heat Dissipation System
9. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Charger not turning on/display off | No power, loose connection, faulty outlet. | Check power cord connection, try a different outlet. Ensure battery clamps are correctly connected. |
| "Error" displayed on screen | Incorrect battery connection (reverse polarity), battery voltage too low, severely damaged battery. | Verify positive and negative connections. Check battery voltage; if below 2.0V, the charger may not initiate. The charger cannot activate completely dead batteries. |
| Charging is slow or incomplete | Incorrect mode selected, battery sulfation, battery capacity too large for charger. | Ensure the correct charging mode is selected. Use "Repair Mode" for sulfated batteries (if applicable). Verify battery capacity is within the 6-150Ah range. |
| Charger gets hot | Normal operation, poor ventilation, fan obstruction. | Some warmth is normal. Ensure the charger is in a well-ventilated area and the fan is not blocked. The charger has over-temperature protection. |
10. User Tips
- Screen Protection: The LCD screen comes with a protective film. Remove it for a clearer display.
- Battery Maintenance: Use the pulse repair function periodically to help maintain battery health and extend its lifespan, especially for older batteries.
- Automatic Charging: The charger is fully automatic and will stop charging once the battery is full, preventing overcharging. You can leave it connected for maintenance charging.
- Temperature Compensation: The automatic winter/summer mode adjusts charging based on ambient temperature, ensuring optimal charging in different climates.
11. Warranty and Support
For warranty information, technical support, or any questions regarding your FOXSUR Smart Car Battery Charger, please refer to the contact details provided by your retailer or the manufacturer's official website. Keep your proof of purchase for warranty claims.