1. Introduction
This manual provides essential information for the safe and effective use of your ALLOYSEED 400A Car Battery Charger. This intelligent pulse repair charger is designed for 12V/24V lead-acid batteries, offering versatile compatibility, advanced repair technology, and comprehensive safety features. Please read all instructions carefully before operation.
2. General Safety Warnings
Read and understand all instructions in this manual before using the product. Keep these instructions for future reference and pass them on to any subsequent user.
- This product is intended for household use only. Use it only as described in this manual.
- Do not use the product if it is damaged in any way.
- This product is intended for use by persons aged 18 years and above.
- It may be used by persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge only if they have been given supervision or instruction and understand the hazards involved.
- WARNING: 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.
- Strictly prohibited to charge lithium batteries. This charger is designed exclusively for lead-acid batteries.
3. Product Overview
The ALLOYSEED 400A Car Battery Charger is an intelligent device featuring a five-stage, five-level pulse intelligence repair system. It automatically identifies battery capacity, current, and voltage, and offers multiple safety protections.
Key Features:
- Versatile Compatibility: Supports lead-acid, dry cell, water battery, and maintenance-free batteries (excluding lithium batteries).
- Advanced Repair Technology: Five-stage pulse repair system to address insufficient power, low voltage, and high internal resistance, extending battery lifespan.
- Intelligent Digital Display: LED screen shows real-time battery capacity, current, and voltage. Automatic 12V/24V identification.
- Comprehensive Safety Features: Six smart protections: reverse connection, short circuit, over-voltage, over-current, overheating, and low voltage.
- Efficient and Quiet Charging: 220W pure copper high-frequency transformer for fast and safe charging, with a built-in cooling fan for heat dissipation.
Components:
- LED Liquid Crystal Display: Shows charging status, voltage, current, and battery percentage.
- Handy Handle: For easy portability.
- Heat Dissipation Holes & Cooling Fan: Ensures efficient cooling during operation.
- Function Switch: To select repair, intelligent, car, or motorbike modes.
- Alligator Clips: Copper-plated for high temperature resistance and excellent conductivity.
- Power Cord & Plug: Thickened power cord for durability.
4. Specifications
| Attribute | Value |
|---|---|
| Product Current | 400A (Peak) |
| Product Power | 220W |
| Rated Charging Current | 10A |
| Output Current | 12V-12A / 24V-9A |
| Voltage Range | 110V-240V (Wide Voltage) |
| Plug Specification | EU/US (Optional) |
| Power Cord Length | 120 CM |
| Clamp Length | 60 CM |
| Product Dimensions (L x W x H) | 175 mm x 160 mm x 60 mm |
| Gross Weight | 800 g |
| Test Range | 6AH-200AH |
| Applicable Battery Types | Lead-acid batteries (EFB, AGM flat panel, AGM winding, gel, WET) |
| Material | Metal |
| Color | Black |
Note: Not suitable for charging lithium batteries.
5. Setup
5.1 Unpacking
Carefully remove the charger and its accessories from the packaging. Ensure all components are present and undamaged:
- 1 x ALLOYSEED 400A Car Battery Charger
- 1 x Set of Alligator Clips (Red and Black)
5.2 Connecting to the Battery
- Ensure the charger is unplugged from the power outlet before making any connections.
- Identify the positive (+) and negative (-) terminals on your battery. The positive terminal is usually marked with a plus sign and is larger, while the negative terminal is marked with a minus sign.
- Connect the RED alligator clip to the battery's POSITIVE (+) terminal.
- Connect the BLACK alligator clip to the battery's NEGATIVE (-) terminal.
- Ensure the connections are secure and free from corrosion.
6. Operating Instructions
6.1 Initial Power-Up
- After connecting the alligator clips to the battery, plug the charger's power cord into a standard 110V-240V AC power outlet.
- The LED display will light up, automatically detecting the battery voltage (12V or 24V) and displaying the current status.
6.2 Charging Modes
The charger offers both intelligent (automatic) and manual charging modes, along with a pulse repair function.
- Intelligent Mode (Automatic): This is the default and recommended mode. The charger automatically detects the battery type and condition, adjusts the charging current, and stops charging once the battery is full. This prevents overcharging and prolongs battery life.
- Manual Mode: For specific situations where continuous charging is desired (e.g., to further activate a deeply discharged battery). In this mode, the charger will continue to charge even after the battery is full. Monitor the battery closely in manual mode to prevent overcharging.
- Pulse Repair Function: This function uses a five-stage, five-level pulse system to repair batteries with issues like insufficient power, low voltage, or high internal resistance. Select the 'Repair' option on the function switch.
6.3 Interpreting the LED Display
The LED liquid crystal display provides real-time information:
- Voltage Display (V): Shows the current battery voltage.
- Power Display (%): Indicates the estimated charge level of the battery (25%, 50%, 75%, 100%).
- Charging Current Display (A): Shows the current charging amperage.
- Charging Tips / Reverse Cue: Visual indicators for charging status and warnings for incorrect connections.
6.4 Disconnecting the Charger
- Unplug the charger from the AC power outlet first.
- Disconnect the BLACK alligator clip from the battery's NEGATIVE (-) terminal.
- Disconnect the RED alligator clip from the battery's POSITIVE (+) terminal.
7. Maintenance
- Keep the charger clean and dry. Wipe the exterior with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners.
- Ensure the ventilation holes and cooling fan are free from dust and debris to maintain efficient heat dissipation.
- Inspect the power cord and alligator clips regularly for any signs of damage. Do not use the charger if any part is damaged.
- Store the charger in a cool, dry place away from direct sunlight and moisture when not in use.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Charger not turning on/display not lighting up | No power from outlet; loose connection; damaged power cord. | Check power outlet; ensure secure connections; inspect power cord for damage. |
| Charger not charging battery | Incorrect battery connection (reverse polarity); battery type not supported (e.g., lithium); battery severely damaged. | Verify correct positive/negative connections; ensure battery is lead-acid; consult a professional for severely damaged batteries. |
| Charger fan running continuously after charging is complete | In manual charging mode; charger still dissipating residual heat. | If in intelligent mode, the fan should turn off after full charge and cool down. If in manual mode, disconnect when charging is complete. |
| Display shows error or warning | Safety protection activated (e.g., reverse connection, short circuit, over-voltage). | Check connections for reverse polarity or short circuits. Ensure battery voltage is within supported range. |
9. User Tips
- Battery Type: Always confirm your battery is a lead-acid type (EFB, AGM, gel, WET) before connecting. This charger is NOT for lithium batteries.
- 400A vs. 10A: The product is labeled 400A, which likely refers to a peak or starting current capability. The actual rated charging current is 10A.
- Automatic Operation: For most users, the intelligent (automatic) mode is sufficient. The charger will detect 12V/24V batteries and stop charging automatically when full.
- No External Device Power: This device is a battery charger, not a power supply. Do not attempt to plug in and operate 12V electronic devices directly from the charger.
- PDF Manual: For more detailed information and diagrams, please refer to the official user manual PDF: User Manual (PDF).
10. Compliance Information
This product complies with relevant safety and environmental standards.
- CE Mark: Indicates conformity with health, safety, and environmental protection standards for products sold within the European Economic Area (EEA).
- FC Mark: Indicates compliance with Federal Communications Commission standards for electronic devices.
- RoHS Compliant: Restricts the use of specific hazardous materials in electrical and electronic products.
11. Warranty & Support
For any questions, technical support, or warranty claims, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.
For a comprehensive guide and additional details, please refer to the official user manual available in PDF format:





