1. Introduction
This manual provides essential instructions for the safe and effective use of your DWEII Type C BMS 4S 2A Lithium Battery Charger Board. This module is designed to charge 4-cell (4S) lithium-ion or lithium-polymer battery packs with a nominal voltage of 14.8V (charging to 16.8V) using a Type-C USB input. Please read this manual thoroughly before operation.
2. Safety Information
Warning: Improper handling of lithium batteries and charging circuits can lead to fire, explosion, or severe injury. Always exercise extreme caution.
- Ensure correct polarity when connecting batteries. Reverse polarity can damage the module and battery.
- Only use this module with compatible 4S lithium-ion or lithium-polymer battery packs. Do not attempt to charge other battery types.
- Do not exceed the specified input voltage (DC 3-6V, recommended 3.7V-5V) or output charging current (2A input for this model).
- Operate in a well-ventilated area, away from flammable materials.
- Monitor the charging process, especially during the first few charges. Disconnect immediately if you observe any unusual heat, swelling, or smoke.
- Keep out of reach of children.
- This module is for experienced users familiar with electronics and battery safety.
3. Product Overview
The DWEII Type C BMS 4S 2A Charger Board is a compact step-up boost module designed for charging 4-cell lithium battery packs. It features a Type-C USB input for convenient power supply and integrated battery management system (BMS) functions for protection.
Figure 3.1: Top view of the DWEII 4S 2A Charger Board. This image highlights the Type-C input port, the main inductor, integrated circuits, and clearly labeled connection points for BAT (battery positive), GND (ground), CR (charge indicator LED), and OK (fully charged indicator LED).
Key Features:
- Type-C USB 5V input.
- Designed for 4S (16.8V) Li-Po/Li-Ion battery charging.
- Integrated battery overvoltage protection.
- Protection against battery voltage being lower than input.
- Short battery protection.
- LED indicators for charging status and full charge.
- Compact size for various applications.
4. Setup and Connections
Before connecting, ensure your battery pack is a 4S (14.8V nominal) lithium-ion or lithium-polymer type. This specific module is pre-configured for 4S 2A operation.
Figure 4.1: Bottom view of the DWEII Charger Board. This image shows the solder pads labeled '2S', '3S', '4S', '1A', and '4A'. For the 4S 2A model, the '4S' pad is typically bridged, and the '2A' current limit is set by default components.
- Identify Connections:
- VIN: Type-C USB input for power (DC 3-6V, recommended 5V).
- BAT: Positive terminal for the 4S battery pack.
- GND: Ground terminal for both input power and battery pack.
- Connect Battery: Carefully solder or connect the positive terminal of your 4S battery pack to the BAT pad and the negative terminal to the GND pad. Double-check polarity before making connections.
- Connect Power: Plug a Type-C USB cable into the VIN port and connect it to a 5V USB power source (e.g., a phone charger, power bank, or computer USB port).
Upon successful connection of power, the "CR" LED should illuminate, indicating the charging process has begun.
5. Operating Instructions
Once the module is set up and connected, the charging process is largely automatic.
- Initiate Charging: Connect the Type-C power source. The "CR" LED will light up, indicating that charging is active.
- Monitor Charging: Observe the LED indicators (see Section 6) to track the charging status.
- Completion: When the battery pack is fully charged to 16.8V, the "OK" LED will illuminate, and the "CR" LED may turn off or dim, depending on the specific charging cycle.
- Disconnect: Once charging is complete, disconnect the Type-C power source and then the battery pack.
The module provides a constant current (CC) and constant voltage (CV) charging profile, which is standard for lithium batteries.
6. LED Indicators
The charger board features two LED indicators to provide visual feedback on the charging status:
- "CR" LED: This LED indicates the charging status.
- ON: Battery is currently charging.
- OFF: Charging is not active (either no power input, no battery connected, or charging is complete and "OK" LED is on).
- "OK" LED: This LED indicates the full charge status.
- ON: Battery is fully charged, or the module is in constant voltage mode.
- OFF: Battery is not yet fully charged.
7. Specifications
The following specifications apply to the DWEII Type C BMS 4S 2A Charger Board:
Figure 7.1: Dimensions of the DWEII 4S 2A Charger Board. The module measures approximately 37mm in length and 18mm in width.
| Feature | Value |
|---|---|
| Input Voltage | DC 3-6V (Recommended DC 3.7V-5V) |
| Input Current | 2A (for 2A Version) |
| Charging Voltage (4S) | 16.8V |
| Charging Current (4S) | 0.56A (for 2A Version) |
| Operating Temperature | -40°C to +85°C |
| Dimensions (L x W x H) | 39mm x 18mm x 6.3mm (approx. 1.54" x 0.71" x 0.25") |
| Weight | 5g |
Note: The charging current listed (0.56A for 4S 2A version) refers to the actual current delivered to the battery, which is derived from the input current and boost conversion efficiency. The "2A" in the model name refers to the input current capability or a general classification.
8. Troubleshooting
- CR LED does not light up:
- Check if the Type-C power source is providing 5V and sufficient current.
- Ensure the Type-C cable is functional and properly connected.
- Verify battery connections (BAT and GND) for correct polarity and secure contact.
- The battery might already be fully charged (check OK LED).
- OK LED is always on:
- The battery is likely fully charged.
- If the battery is not fully charged, there might be an issue with the battery itself or the connection.
- Module gets excessively hot:
- Ensure the input current does not exceed 2A.
- Verify the battery pack is indeed 4S. Charging an incompatible battery type can cause overheating.
- Ensure adequate ventilation around the module.
- Disconnect immediately if overheating occurs.
- Battery does not charge to 16.8V:
- Confirm the battery pack is healthy and capable of reaching 16.8V.
- Check for loose connections or poor solder joints.
- Ensure the input power supply is stable and sufficient.
9. Maintenance
- Keep the module clean and free from dust and moisture.
- Store in a dry, cool environment when not in use.
- Avoid physical shock or excessive vibration.
- Regularly inspect connections for any signs of wear or corrosion.
10. Warranty and Support
Warranty information for this product is not explicitly provided in the product details. For any technical support, inquiries, or warranty claims, please contact your retailer or the manufacturer, DWEII, directly through their official channels or the platform where the product was purchased.
Always refer to the original purchase documentation for specific warranty terms and conditions that may apply.
11. Official Product Videos
No official product videos from the seller were found for this specific model.