1. Introduction
Thank you for choosing the FOXSUR 25A Smart Car Battery Charger. This intelligent charger is designed to provide efficient and safe charging for a wide range of 12V and 24V batteries, including those found in cars, motorcycles, trucks, boats, and other vehicles. Featuring an 8-stage charging process, multiple protection mechanisms, and an aluminum alloy shell for durability and heat dissipation, this charger ensures optimal battery health and performance. Please read this manual thoroughly before use to ensure proper operation and safety.
2. Safety Instructions
Always observe the following safety precautions to prevent injury or damage to the charger or battery:
- Read all instructions before using the charger.
- Ensure adequate ventilation during charging. Do not operate in a confined area.
- Wear eye protection and protective clothing when working with batteries.
- Keep the charger away from flammable materials, sparks, and open flames.
- Never charge a frozen battery.
- Do not expose the charger to rain or excessive moisture.
- Disconnect the AC power supply before making or breaking the connections to the battery.
- Connect the battery clips correctly: RED to the positive (+) terminal and BLACK to the negative (-) terminal.
- This product contains chemicals, including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
The charger is equipped with intelligent multiple protection features:
- Overheat Protection
- Overcurrent Protection
- Electric Shock Protection
- Short Circuit Protection
- Reverse Connect Protection
- Overvoltage Protection
- Low Voltage Protection
- Fire Protection

3. Package Contents
Upon unpacking, please verify that all items are present and in good condition:
- 1 x FOXSUR 25A Smart Car Battery Charger
- 1 x User Manual
4. Product Overview
The FOXSUR Smart Car Battery Charger features a robust design with an intuitive digital display and user-friendly controls.



4.1. Display Panel
The large digital display provides real-time information on the charging process, including:
- Voltage: Current battery voltage.
- Current: Charging current (A).
- Battery Level: Visual indicator of battery charge percentage.
- Temperature: Ambient temperature, influencing automatic mode selection (Winter/Summer).
- Charging Mode: Currently selected battery type/mode (CAR/BOAT, AGM, LiFePO4, REPAIR, BOOSTER).
- Charging Current Option: Selected current (2A, 8A, 20A, 25A, or Auto).
4.2. Controls
- CURRENT Button: Used to select the desired charging current (2A, 8A, 20A, 25A, or automatic).
- MODE Button: Used to cycle through different battery types and special charging modes (CAR/BOAT, AGM, LiFePO4, REPAIR, BOOSTER).
4.3. Design Features
- Aluminum Alloy Shell: Provides durability, high temperature resistance, and corrosion resistance.
- Winding Cable Design: Unique design on the back allows for organized storage of the power cord and clips.
- Replaceable Power Cord: The power cord can be replaced if needed.

5. Specifications
| Feature | Specification |
|---|---|
| Product Model | FPT-250 |
| Input Voltage | 100-240V AC, 50-60Hz |
| Rated Output | 12V 25A, 24V 15A |
| Minimum Start Voltage | 5.0V |
| Battery Range | 6-400Ah |
| Battery Types | GEL, AGM, WET, LiFePO4, Calcium, EFB, Deep Cycle, Lead Acid, etc. |
| Efficiency | Approx. 85% |
| Thermal Protection | 65°C +/- 5°C |
| Cooling | Fan |
| Dimensions (LxWxH) | 216mm x 125mm x 192mm (8.5 x 4.9 x 7.6 inches) |
| Item Weight | 1730g |
| Material | ABS Alloy |
| Compliant Standards | CE, FCC |

6. Setup
Follow these steps to set up your FOXSUR battery charger:
- Plug into Power: Connect the charger's AC power cord to a standard wall outlet.
- Connect to Battery: Attach the RED (+) battery clamp to the positive terminal of the battery and the BLACK (-) battery clamp to the negative terminal of the battery. Ensure a secure connection.
- Select Charging Mode: Press the 'MODE' button to select the appropriate battery type and charging mode for your battery.
- Select Charging Current: Press the 'CURRENT' button to choose the desired charging current (2A, 8A, 20A, 25A, or automatic).

7. Operating Instructions
7.1. Automatic Temperature Detection
The charger automatically adjusts the charging voltage based on the ambient temperature. It detects 'Winter mode' at 10°C and 'Summer mode' at 28°C, optimizing charging performance for different environmental conditions.

7.2. 8-Stage Charging Process
The charger employs an advanced 8-stage charging process for comprehensive battery care:
- Battery Desulphation: Recovers sulfated batteries.
- Soft Start Charge: Gently begins the charging process.
- Bulk Charge: Charges the battery to approximately 80% capacity.
- Absorption Charge: Charges the battery to 100% capacity at a decreasing current.
- Battery Test: Checks battery condition.
- Recondition Charge: Further reconditions the battery.
- Float & Maintenance Charging: Maintains the battery at full charge.
- Re-start Charge: Initiates a new charging cycle if the battery voltage drops.

7.3. Charging Current and Mode Selection
The charger offers various current and mode options to suit different battery types and charging needs:
- Current Options: 2A, 8A, 20A, 25A, and Automatic.
- Mode Options: CAR/BOAT, AGM, LiFePO4, REPAIR, BOOSTER.

7.4. Booster Mode (12V Batteries Only)
The Booster mode is specifically designed for 12V batteries to provide a quick burst of charge for starting a vehicle. When 'Booster' mode is selected, the charging current reaches its maximum value for 200 seconds. After this period, the display will show 'on', indicating that you can now attempt to start your car.

7.5. Repair Mode (Pulse Reconditioning)
The Repair mode utilizes pulse reconditioning to address common battery issues such as sulfation, inability to hold a charge, and high internal resistance. This mode helps to restore and extend the life of your battery.

8. Maintenance
To ensure the longevity and optimal performance of your FOXSUR battery charger, follow these maintenance guidelines:
- Cleaning: Disconnect the charger from power and the battery before cleaning. Wipe the exterior with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Storage: Store the charger in a cool, dry place when not in use. Utilize the winding cable design for neat storage of cables.
- Heat Dissipation: The aluminum alloy shell and internal fan provide excellent heat dissipation. Ensure the fan vents are not obstructed during operation to prevent overheating.


9. Troubleshooting
The FOXSUR charger is designed with multiple safety features to prevent common issues. If you encounter problems, consider the following:
- Charger Not Turning On: Ensure the power cord is securely plugged into a live AC outlet. Check for power outages or tripped circuit breakers.
- Not Charging/Error Display:
- Verify that the battery clamps are correctly connected to the battery terminals (RED to +, BLACK to -).
- Check for loose or corroded battery connections.
- Ensure the selected charging mode matches your battery type.
- If the battery voltage is extremely low (below 5.0V), the charger may not initiate charging.
- The charger has built-in protection against reverse polarity, short circuits, and overvoltage. If these conditions are detected, the charger will not operate or will display an error. Correct the issue and restart the charging process.
- Overheating: The charger has over-temperature protection. If it becomes too hot, it will reduce output or shut down. Ensure adequate ventilation and that the cooling fan is not obstructed.
If the problem persists after checking these points, please contact customer support.
10. User Tips
- Always double-check the battery type and select the corresponding mode on the charger for optimal and safe charging.
- For vehicles that are stored for extended periods, consider using the charger's float and maintenance charging stage to keep the battery topped up and prevent discharge.
- Regularly inspect battery terminals and cables for corrosion and clean them as necessary to ensure good electrical contact.
11. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the documentation provided with your purchase or contact the seller directly. Keep your purchase receipt as proof of purchase.





