1. Introduction
The Haisito P40 40A Car Battery Charger is an advanced, intelligent device designed for charging and maintaining various types of 6V, 12V, and 24V batteries. It is compatible with Lithium (LiFePO4) and Lead-Acid batteries, including AGM, Calcium, Gel, MF, EFB, SLA, VRLA, and WET types. This charger features a multi-stage automatic charging process, a repair mode for weak batteries, and comprehensive safety protections, making it suitable for cars, motorcycles, boats, RVs, and agricultural vehicles.
2. Safety Instructions
Please read and understand all safety instructions before operating the charger. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Ventilation: Ensure adequate ventilation during charging. Batteries can produce explosive gases.
- Eye Protection: Always wear eye protection when working near batteries.
- Skin Protection: Avoid contact with battery acid. If contact occurs, rinse immediately with water.
- Ignition Sources: Keep sparks, flames, and smoking materials away from the battery and charger.
- Connection Order: Connect the charger to the battery terminals before plugging it into a power outlet. Disconnect in reverse order.
- Polarity: Ensure correct polarity connection (red clamp to positive, black clamp to negative). Reverse polarity protection is built-in, but correct connection is always recommended.
- Damaged Batteries: Do not attempt to charge frozen, damaged, or non-rechargeable batteries.
- Indoor Use: This charger is designed for indoor use. Do not expose to rain or excessive moisture.
- Children: Keep out of reach of children.

The charger incorporates multiple safety features including protection against overcurrent, overcharge, overheat, short circuit, reverse polarity, and overvoltage, ensuring safe operation. It also features a cooling system.
3. Product Overview
3.1 Key Features
- Multi-Voltage Compatibility: Automatically detects and charges 6V, 12V, and 24V batteries.
- Wide Battery Type Support: Compatible with Lithium (LiFePO4) and Lead-Acid (AGM, Calcium, Gel, MF, EFB, SLA, VRLA, WET) batteries.
- Intelligent 9-Stage Charging: Provides an optimized charging cycle for efficiency and battery longevity.
- Repair Mode: Designed to recondition and activate weak or sulfated lead-acid batteries. Note: Repair mode is only for lead-acid batteries.
- LCD Display: Large screen displays real-time voltage, current, temperature, and charge percentage.
- Climate Optimization: Automatic Summer and Winter modes adjust charging parameters based on ambient temperature.
- Comprehensive Protections: Includes overcurrent, overcharge, overheat, short circuit, reverse polarity, and overvoltage protection.
- Selectable Current: Offers Low, Medium, and High current settings for different charging needs.

This image illustrates the Haisito P40 charger's ability to automatically identify 6V, 12V, or 24V batteries and its compatibility with various battery types including Lithium (LiFePO4) and Lead-Acid (AGM, Calcium, Gel, MF, EFB, SLA, VRLA, WET).
3.2 Components
- Haisito P40 Battery Charger Unit
- AC Power Cable (1.6m)
- Battery Clamps (1m)
- User Manual

This image highlights design details such as the built-in cooling fan for heat dissipation, an easy-to-handle design, the extra-large digital display screen, and convenient harness clip storage.
4. Setup
- Prepare the Battery: Ensure the battery terminals are clean and free of corrosion. If necessary, clean them with a wire brush and a baking soda solution.
- Connect to Battery: First, connect the red (+) positive clamp to the positive terminal of the battery. Then, connect the black (-) negative clamp to the negative terminal of the battery.
- Connect to Power: Plug the AC power cable into a standard wall outlet (100-240V AC, 50/60Hz). The charger will power on and begin its diagnostic process.
- Initial Display: The LCD screen will illuminate, displaying the current battery voltage and other relevant information.
5. Operating Instructions
5.1 Automatic Charging
The Haisito P40 charger features an intelligent 9-stage charging process. Once connected, it automatically detects the battery voltage (6V, 12V, or 24V) and type, then initiates the appropriate charging cycle.

This diagram details the 9-stage automatic charging process, which includes battery desulfation, soft start, bulk charging, absorption, trickle charging, battery test, recondition, float & maintenance, and small current maintenance, for efficient and safe charging.
5.2 LCD Display Interpretation
The LCD screen provides real-time feedback on the charging process:
- Voltage (V): Displays the current battery voltage.
- Current (A): Shows the charging current.
- Temperature (°C/°F): Indicates the ambient temperature, influencing automatic climate modes.
- Charge Percentage: A bar graph or percentage value indicating the battery's charge level.
- Mode Indicators: Icons for Summer Mode, Winter Mode, Repair Mode, and selected current (Low, Medium, High).

The large LCD screen provides real-time information on battery voltage, charging current, temperature, and charge level percentage, ensuring clear monitoring of the charging process.
5.3 Mode Selection (One-Click Operation)
The charger allows for easy selection of charging modes with a single click:
- Voltage/Battery Type: The charger automatically detects 6V, 12V, or 24V and the battery type (Lithium or Lead-Acid). No manual selection is typically needed for these.
- Current Selection: Press the 'Mode' button to cycle through Low, Medium, and High charging current settings. Refer to the table below for current values.
- Repair Mode: Press the 'Repair' button to activate the pulse repair function for lead-acid batteries. This mode attempts to restore weak or sulfated batteries.

This image highlights the three selectable charging current speeds (Low, Medium, High) for different voltage batteries, along with the dedicated Repair Mode function to recondition and activate weak batteries.
Charging Current Settings:
| Voltage | Low Current | Medium Current | High Current |
|---|---|---|---|
| 6V | 2A | 5A | 10A |
| 12V | 3A | 15A | 40A |
| 24V | 5A | 8A | 16A |
5.4 Climate Optimization (Summer/Winter Mode)
The charger automatically detects the ambient temperature and adjusts its charging voltage accordingly to ensure optimal charging performance and prevent overcharging or undercharging in extreme temperatures.
- Summer Mode: Automatically activates when the ambient temperature is above 36°C.
- Winter Mode: Automatically activates when the ambient temperature is below 8°C.

The charger automatically adjusts its charging parameters based on ambient temperature, activating Summer mode above 36°C and Winter mode below 8°C, to optimize charging performance in different climates.
5.5 Disconnecting the Charger
- Unplug the AC power cable from the wall outlet.
- Remove the black (-) negative clamp from the battery's negative terminal.
- Remove the red (+) positive clamp from the battery's positive terminal.
6. Maintenance
- Cleaning: Disconnect the charger from power and battery before cleaning. Wipe the casing with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the charger in a cool, dry place when not in use. Ensure cables are neatly coiled and not kinked.
- Cable Inspection: Regularly inspect the AC power cable and battery clamps for any signs of damage. Do not use the charger if cables or clamps are damaged.
7. Troubleshooting
- Charger Not Turning On:
- Check if the AC power cable is securely plugged into the wall outlet.
- Verify the wall outlet has power.
- Battery Not Charging:
- Ensure battery clamps are correctly and securely connected to the battery terminals (red to positive, black to negative).
- Check if the battery is completely discharged. A completely discharged battery may not be activated or charged by the repair mode.
- Confirm the battery type is compatible with the charger.
- The charger automatically detects faulty batteries. If a faulty battery is detected, it will not charge.
- Repair Mode Not Working:
- Repair mode is only available for lead-acid batteries. It will not work on lithium (LiFePO4) batteries.
- Severely damaged or completely dead batteries may not be recoverable by the repair function.
- Overheat Protection Activated:
- Ensure the charger's ventilation slots are not blocked.
- Allow the charger to cool down in a well-ventilated area.
8. Specifications
| Specification | Value |
|---|---|
| Model Number | P40-EU-Haisito |
| AC Input Voltage | 100-240V ~ 50/60Hz |
| Output Voltage | 6V / 12V / 24V (Auto-detection) |
| Output Current | 6V/10A, 12V/40A, 24V/16A (Max) |
| Max Output Power | 340W |
| Battery Types | Lithium (LiFePO4), Lead-Acid (AGM, GEL, SLA, Flooded, WET, EFB, etc.) |
| Dimensions (L x W x H) | 230 x 185 x 110 mm (approx. 9.05 x 7.28 x 4.33 inches) |
| Net Weight | 1500g |
| Manufacturer | HTRC |

This image provides a visual representation of the charger's dimensions and lists key electrical specifications such as AC input, output power, output current, and compatible battery types.
9. Support
For any questions or assistance regarding your Haisito P40 battery charger, please refer to the contact information provided with your purchase or reach out to the seller directly. We are committed to providing the best possible service.

