FMS A400 3S/4S LiPo Battery Charger Instruction Manual

1. Introduction

Thank you for choosing the FMS A400 3S/4S LiPo Battery Charger. This compact and efficient charger is designed to safely and effectively charge your 11.1V (3S) and 14.8V (4S) Lithium Polymer (LiPo) batteries. It is compatible with a wide range of FMS RC models, ensuring your batteries are always ready for optimal performance. Please read this manual thoroughly before use to ensure safe and correct operation.

2. Important Safety Information

• LiPo Battery Hazards: Lithium Polymer (LiPo) batteries are highly reactive and can be dangerous if not handled properly. Always follow the battery manufacturer's instructions.
• Unattended Charging: Never leave charging batteries unattended. Always charge in a fire-safe area, away from flammable materials.
• Ventilation: Ensure adequate ventilation during charging to prevent overheating.
• Correct Voltage/Cell Count: Always verify the battery's voltage and cell count (3S or 4S) match the charger's setting before connecting. Incorrect settings can lead to severe battery damage or fire.
• Damage Inspection: Do not charge damaged, swollen, or punctured batteries. Discontinue charging immediately if the battery becomes hot, swells, or shows any signs of damage.
• Children and Pets: Keep the charger and batteries out of reach of children and pets.
• Power Source: Use only the provided power adapter or a compatible, approved power source.

3. Package Contents

Please check the package contents to ensure all items are present:

• FMS A400 3S/4S LiPo Battery Charger Unit
• AC Power Cable

Figure 1: Generic LiPo Charger unit (Hot RC branded) and AC power cable. The FMS A400 charger will have similar components.

4. Product Overview

The FMS A400 charger is a straightforward and reliable unit designed for ease of use. It features dedicated balance ports for 3S and 4S LiPo batteries and indicator lights to show charging status.

Key Features:

• Supports 3S (11.1V) and 4S (14.8V) LiPo batteries.
• Integrated balance charging for cell voltage equalization.
• LED indicators for charging status (Charging/Full).
• Compact and portable design.

Components:

• Power Input: Connects to the AC power cable.
• Balance Ports: Dedicated ports for 3S and 4S battery balance leads.
• Status Indicators: LEDs (typically red for charging, green for full) for each cell or overall status.

5. Setup and Connection

1. Connect Power: Plug the AC power cable into the charger's power input port, then plug the other end into a suitable wall outlet (100-240V AC).
2. Prepare Battery: Ensure your LiPo battery is undamaged and at room temperature. Identify if it is a 3S (11.1V) or 4S (14.8V) battery.
3. Connect Balance Lead: Locate the white balance connector on your LiPo battery. Carefully plug this connector into the corresponding balance port on the charger (labeled "3S" or "4S"). Ensure the connector is inserted correctly and fully seated.
4. Connect Main Discharge Lead (Optional/If applicable): Some chargers may require the main discharge lead (e.g., XT60, T-Plug) to be connected for charging. Refer to your battery's specific instructions. The FMS A400 primarily uses the balance port for charging.

6. Operation (Charging)

1. Once the battery's balance lead is correctly connected to the appropriate port (3S or 4S), the charger will automatically begin the charging process.
2. The status indicator LEDs will illuminate red (or similar color) to indicate that charging is in progress. Each cell's LED may light up individually or a single overall charging LED will be active.
3. When the battery is fully charged, the status indicator LEDs will turn green (or similar color) for all cells, or the overall charging LED will change to green.
4. Once charging is complete, disconnect the battery from the charger. First, remove the balance lead, then any main discharge lead if connected.

Note: The FMS A400 is a simple balance charger. It automatically detects the cell count (3S or 4S) based on the port used and charges accordingly. There are no manual settings for charge current or voltage on this model.

7. Maintenance and Storage

• Cleaning: Keep the charger clean and free from dust and debris. Use a dry, soft cloth to wipe the surface. Do not use solvents or abrasive cleaners.
• Storage: Store the charger in a cool, dry place away from direct sunlight, moisture, and extreme temperatures.
• Battery Storage: Always store LiPo batteries at a "storage charge" level (typically 3.8V per cell) if not used for an extended period. Do not store fully charged or fully discharged LiPo batteries.
• Cable Care: Inspect all cables and connectors regularly for any signs of wear or damage. Replace damaged cables immediately.

8. Troubleshooting

9. Specifications

10. Warranty and Support

For warranty information, technical support, or service inquiries, please contact FMS customer service directly. Refer to the product packaging or the FMS official website for the most up-to-date contact details.