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