3S TYPE C TO 12.6V LITHIUM BATTERY CHARGER

🔹 3-6V to 12.6V 3S Lithium Battery Charger Module (Type-C Input)

A compact, integrated charging and protection module designed specifically for 3-series (3S) lithium-ion or lithium-polymer battery packs (11.1V nominal, 12.6V full charge). It features a modern USB Type-C input for easy charging from standard 5V adapters or power banks, making it ideal for DIY 12V portable projects.

✅ Specifications:

• Battery Compatibility: 3-Cell Lithium-ion (Li-ion) or LiPo in series (3S)

• Charge Voltage: 12.6V (Constant Voltage phase)

• Charge Current: Typically 1A – 2A (Depends on module version and input capability)

• Input Voltage: 5V DC (via USB Type-C port)

• Input Current: Up to 2.4A (for 2A charging, requires a capable 5V/2.4A+ adapter)

• Charge Method: CC/CV (Constant Current / Constant Voltage) with automatic termination

• Integrated Protections (BMS):

  • Over-charge protection

  • Over-discharge protection

  • Over-current / Short-circuit protection

  • Cell balancing (passive balancing in most modules)

• Connections:

  • Input: USB Type-C female port

  • Output/Battery: Screw terminals or solder pads for B- (Battery-), B1 (Cell 1+), B2 (Cell 2+), B3 (Cell 3+), B+ (Battery+) for the 3S pack.

• Status Indicators: LEDs for Charging (Red) and Full (Green) are common.

• Module Size: Small PCB, typically ~ 45mm x 25mm

⚙️ Key Features:

• All-in-One Solution: Combines a boost charger (5V to 12.6V) with a full 3S Battery Management System (BMS).

• Modern Type-C Interface: Convenient and reversible connector for charging.

• Cell Balancing: Essential for safety and longevity of series-connected lithium batteries. Balances cell voltages during charging.

• Compact & Efficient: Integrates charging, protection, and balancing into a single module.

• Simple to Use: Just connect your 3S battery pack to the correct terminals and plug in a Type-C cable.

📦 Typical Applications:

• DIY 12V Portable Power Packs: Creating custom power banks for portable speakers, LED lights, or camping gear.

• Robotics & RC Projects: Charging 3S LiPo packs for drones, robots, or RC vehicles.

• Backup Power Systems: For routers, security cameras, or Raspberry Pi clusters using 3S battery packs.

• Solar Charging Controllers: As the battery management and charging endpoint for small 5V solar panels.

• Electric Bike/Trike Accessories: Charging auxiliary 3S battery packs for lights or electronics.

🔧 Wiring & Setup Guide:

⚠️ CAUTION: Incorrect wiring of a 3S battery pack can cause fire or damage. Double-check connections before applying power.

1. Connect the 3S Battery Pack:

   • Connect the B- terminal to the NEGATIVE of the first cell (lowest potential).

   • Connect B1 to the POSITIVE of the first cell (this is also the NEGATIVE of the second cell).

   • Connect B2 to the POSITIVE of the second cell (this is also the NEGATIVE of the third cell).

   • Connect B3 to the POSITIVE of the third cell (this is also the NEGATIVE of the… non-existent fourth cell).

   • Connect B+ to the POSITIVE of the third cell (same as B3 on most modules, but use the designated B+ pad if separate).

   • Check your specific module’s label diagram carefully.

2. Charging: Plug a 5V, 2A (or higher) USB Type-C adapter into the module. The Red LED will light during charging, switching to Green when fully charged.

3. Load Connection: Connect your 12V load between the B+ and B- terminals. The BMS will provide discharge protection.

⚠️ Critical Safety & Usage Warnings:

• Battery Matching is Mandatory: Only use three identical, same-age, same-capacity lithium cells that have been previously balanced. Never mix old/new or different brand/capacity cells.

• Charge Current Limitation: The module boosts 5V to 12.6V. This means input current > output current. For a 1A charge, input may draw >2.5A. Use a high-quality 5V/3A adapter for reliable charging.

• No Low-Temp Charging: Do not charge lithium batteries below 0°C (32°F).

• Balancing is Passive: Most modules use simple resistor-based balancing, which only works near the end of charge. Ensure your pack is balanced before first use.

• Monitor First Charge: Always charge a new or unknown battery pack in a fire-safe area and monitor for overheating.

• Voltage Check: Before first connection, verify your 3S pack voltage is between 9.0V (cut-off) and 12.6V (full).