Lithium Battery Charger Module (3S 18650 – 12.6V – 2A) USB Type C

3S 12.6V 2A 18650 Lithium Battery Charger Module USB‑C

This compact charging board is designed to charge a 3S (three-cell) 18650 lithium-ion battery pack in series. The module uses USB Type‑C for easy power connection and features a step-up boost converter to reach the required 12.6V charging level, making it an excellent choice for DIY power banks, portable power supplies, and custom battery setups.

Technical Specifications:

• Cell Configuration: 3 × 18650 lithium-ion cells in series (3S)
• Input Voltage: 5V via USB Type‑C (operates from 3–6 V)
• Maximum Input Current: 2A (for 2A version)
• Charging Current: ~0.74A in 2A version (other variants include 0.37A for 1A, 1.48A for 4A)
• Final Charging Voltage: 12.6V total (4.2V per cell × 3 cells)
• Charging Method: Constant Current / Constant Voltage (CC/CV) with integrated boost converter

Protection Features & Indicators:

• Overcharge protection
• Overcurrent and short-circuit protection
• Thermal protection included
• Dual LED indicators: one for charging status (“CR”), another for full-charge indication (“OK”)

Physical & Environmental Details:

• Dimensions: Approx. 39 × 18 × 6.3 mm
• Weight: Around 5 g
• Operating Temperature: –40 °C to +85 °C

Usage Notes:

• Use a standard 5 V USB‑C power source (not USB PD, which may require voltage negotiation). Works with “dumb” 5 V supplies.
• Ideal for projects requiring ~12 V from a stack of 3×18650 cells.
• Ensure cells are properly balanced before series connection to maintain safety and charging accuracy.

Spec Summary:

• Cell Configuration: 3S (3 × 18650 in series)
• Input Voltage: 5 V via USB Type‑C (operational range ~3–6 V)
• Max Input Current: 2 A (in 2A model)
• Charging Current: ~0.74 A (2A model)
• Final Voltage: 12.6 V (4.2 V per cell × 3)
• Charging Method: CC/CV with boost converter
• Protection: Overcharge, overcurrent, short-circuit, thermal
• LED Indicators: Charging (“CR”) and full-charge (“OK”)
• Size: ~39 × 18 × 6.3 mm; Weight: ~5 g
• Temperature Range: –40 °C to +85 °C