1. Introduction
This manual provides essential instructions for the safe and efficient operation of your Haisito C26A Smart Battery Charger. This device is designed for charging and maintaining 6V, 12V, and 24V Lead-Acid (AGM, Gel, SLA, Flooded, WET, EFB), LiFePO4, and Lithium batteries. Please read this manual thoroughly before first use and retain it for future reference.

Image 1.1: The Haisito C26A Smart Battery Charger, featuring its handle and battery clamps.
2. Safety Information
Always prioritize safety when operating electrical equipment. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Ventilation: Operate the charger in a well-ventilated area. Batteries can produce explosive gases during charging.
- Eye and Skin Protection: Wear appropriate eye protection and protective clothing when working with batteries. Battery acid is corrosive.
- Avoid Sparks: Do not smoke or allow sparks or flames in the vicinity of the battery or charger.
- Connection Order: Connect the output clamps to the battery terminals before plugging the charger into an AC outlet. Disconnect in reverse order.
- Polarity: Ensure correct polarity. Connect the red (+) clamp to the positive battery terminal and the black (-) clamp to the negative battery terminal. Reverse polarity protection is built-in, but correct connection is always recommended.
- Damaged Equipment: Do not operate the charger if it has been dropped, damaged, or if the power cord or clamps are compromised.
- Children and Pets: Keep the charger and batteries out of reach of children and pets.
- Indoor Use: This charger is designed for indoor use. Do not expose it to rain or excessive moisture.
- Battery Type Compatibility: Ensure the charger is compatible with your battery type and voltage. Attempting to charge incompatible batteries can be dangerous.
3. Product Overview
3.1 Components
The Haisito C26A Smart Battery Charger features a compact design with an integrated handle for portability. It includes heavy-duty battery clamps for secure connection.
- Main Unit: Contains the charging circuitry, control panel, and LCD display.
- Integrated Handle: For easy carrying.
- Battery Clamps: Red (+) and Black (-) for connecting to battery terminals.
- AC Power Cord: For connecting to a standard wall outlet (100-240V AC input).
- Control Buttons: For selecting charging modes and current levels.
3.2 LCD Display
The large LCD provides real-time information about the charging process.

Image 3.1: Detailed view of the Haisito C26A's LCD display, showing various charging parameters.
- Charge Current: Displays the current (Amps) being delivered to the battery.
- Charge Voltage: Shows the battery voltage (Volts).
- Battery Voltage: Indicates the detected battery voltage (6V, 12V, 24V).
- Charge Quantity: Displays the accumulated charge (AH).
- Inside Temperature: Shows the internal temperature of the charger.
- Battery Full Indicator: "FUL" indicates the battery is fully charged.
- Standby Indicator: "OFF" indicates the charger is in standby mode.
- Repair Process Ended: "End" indicates the repair process is complete.
- Charging Progress Bar: Visual representation of charge level (25%, 50%, 75%, 100%).
- Mode Indicators: Icons for Winter/Summer mode, Low/Medium/High current, and Repair mode.
4. Setup
Follow these steps to set up your Haisito C26A charger for operation:
- Prepare the Battery: Ensure the battery terminals are clean and free of corrosion. If necessary, clean them with a wire brush.
- Connect to Battery:
- Connect the red (+) clamp to the positive (+) terminal of the battery.
- Connect the black (-) clamp to the negative (-) terminal of the battery.
- Ensure connections are secure.
- Automatic Recognition: The charger will automatically detect the battery voltage (6V, 12V, or 24V) and type (Lithium, LiFePO4, Lead-Acid). This information will be displayed on the LCD.
- Connect to AC Power: Plug the charger's AC power cord into a standard 100-240V AC wall outlet. The charger will power on and begin the charging process based on its automatic detection.

Image 4.1: The Haisito C26A charger demonstrating automatic recognition of 6V, 12V, and 24V batteries, compatible with multiple battery types.
5. Operating Instructions
5.1 9-Stage Smart Charging Process
The Haisito C26A utilizes a 9-stage charging process to optimize battery power precisely and gently, ensuring efficient charging and extending battery life.

Image 5.1: Visual representation of the 9-stage charging process, showing how voltage and current are managed over time.
- Battery Desulfation: Uses pulse current to break down lead sulfate crystals in deeply discharged or sulfated batteries.
- Soft Start Charging: Gradually introduces current to the battery to prevent damage to very discharged batteries.
- Bulk Charging: Charges the battery at its maximum current until it reaches approximately 80% capacity.
- Absorption Charging: Charges at a decreasing current to bring the battery to 100% capacity.
- Trickle Charge: Maintains the battery at full charge with a small, constant current.
- Battery Test: Monitors the battery to ensure it can hold a charge.
- Recondition Charging: Applies a higher voltage to equalize cells and improve battery performance.
- Float & Maintenance Charging: Keeps the battery at optimal voltage for long-term storage.
- Small Current to Maintain Charging: Continuously monitors and provides minimal current to prevent self-discharge.
5.2 Current Selection
The charger offers three adjustable current levels (Low, Medium, High) to suit different battery capacities and charging speed requirements. Press the "Current" button to cycle through the options.

Image 5.2: Current selection options for different battery voltages and the Repair Mode function.
| Battery Voltage | Low Current | Medium Current | High Current |
|---|---|---|---|
| 6V | 2A | 5A | 10A |
| 12V | 3A | 13A | 26A |
| 24V | 5A | 8A | 13A |
Recommendation: Choose a current level appropriate for your battery's capacity. Higher currents charge faster but may not be suitable for smaller batteries.
5.3 Repair Mode
The Repair Mode (indicated by a wrench icon) uses small current pulse cycling to help restore and activate batteries that are sulfated or deeply discharged. This mode can run for up to 24 hours. Caution: This mode is not intended for repairing completely dead or physically damaged batteries.
5.4 Winter and Summer Mode (Temperature Compensation)
The charger automatically detects the ambient temperature and adjusts the charging voltage accordingly. This ensures optimal charging performance in both cold (Winter Mode) and warm (Summer Mode) environments, preventing overcharging or undercharging.

Image 5.3: The charger automatically adapting its charging profile based on ambient temperature for optimal battery health.
5.5 Automatic Full Stop and Maintenance
Once the battery reaches a full charge, the charger will automatically stop the bulk charging process and transition into a maintenance (trickle charge) mode. This prevents overcharging and keeps the battery at an optimal level for extended periods. For safety, the charger requires a reset (unplugging and replugging) for the next charging cycle.
6. Maintenance
- Cleaning: Disconnect the charger from both AC power and the battery before cleaning. Wipe the exterior with a soft, dry cloth. Do not use solvents or abrasive cleaners.
- Storage: Store the charger in a cool, dry place when not in use. Ensure the cables are neatly coiled and not kinked.
- Cable Inspection: Periodically inspect the AC power cord and battery clamps for any signs of damage, fraying, or corrosion. Replace if damaged.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Charger does not turn on. | No AC power; loose connection. | Ensure the AC power cord is securely plugged into a live outlet. Check the outlet with another device. |
| Charger connected but not charging. | Incorrect battery connection; battery too deeply discharged; incompatible battery type. | Verify correct polarity of battery clamps (+ to +, - to -). Ensure battery voltage and type are compatible. If battery is extremely low, the charger may need a moment to detect it or may indicate an error if it's beyond recovery. |
| "FUL" displayed but battery not fully charged. | Battery capacity significantly degraded. | The battery may have reached its maximum charge capacity given its condition. Consider using Repair Mode if applicable, or replacing the battery if it no longer holds a charge. |
| Charger fan is noisy. | Normal operation during high current charging. | The fan activates to dissipate heat during charging. This is normal. Ensure adequate ventilation around the charger. |
| Spark when plugging into AC outlet. | Inrush current. | A small spark upon initial connection to AC power can occur due to inrush current. While generally harmless, ensure connections are firm and avoid plugging/unplugging frequently. |
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | C26A |
| Input Voltage | 100-240V AC |
| Output Voltage | 6V DC, 12V DC, 24V DC (Automatic Detection) |
| Max Output Current | 26 Amps (12V mode) |
| Supported Battery Types | Lead-Acid (AGM/Gel/SLA/Flooded/WET/EFB), LiFePO4, Lithium |
| Charging Stages | 9-Stage Smart Charging |
| Protection Features | Overcharge, Short Circuit, Reverse Polarity, Overheating |
| Temperature Compensation | Automatic Winter/Summer Mode |
| Item Weight | 3.01 pounds (approx. 1.36 kg) |
| Package Dimensions | 9.92 x 8.5 x 5.59 inches (approx. 25.2 x 21.6 x 14.2 cm) |
9. Warranty and Support
For warranty information or technical support, please refer to the documentation included with your purchase or contact Haisito customer service directly. Contact details can typically be found on the manufacturer's official website or through your point of purchase.



