Lithium Battery Charger Module (2S 18650 - 8.4V - 2A) USB Type C

2S 8.4V 2A 18650 Lithium Battery Charger Module Type C

This charger module is designed for charging 18650 lithium-ion batteries connected in series (2S configuration) with a total charging voltage of 8.4V.

It features a USB Type-C input, compact size, and user-friendly operation, making it ideal for DIY power banks, portable electronics, and battery-powered projects.

Key Specifications

• Cell Configuration: 2-cell (2S) lithium-ion, compatible with two 18650 cells in series.
• Charge Method: CC/CV (Constant Current/Constant Voltage) charging.
• Input Interface: USB Type-C port, accepts 5V input.
• Maximum Input Current: Up to 2A.
• Charge Current: Approximately 1.1A (for the 2A version).
• Final Charge Voltage: 8.4V total (4.2V per cell).
• Boost Mode: Integrated step-up converter for 2S charging.

Protection Features

• Overcharge protection to prevent exceeding 4.2V per cell.
• Overcurrent and short-circuit protection.
• Likely includes over-discharge protection and thermal regulation.

LEDs & Status Indicators

• Charging indicator LED (typically red).
• Charge complete indicator LED (typically green or blue).

Features Overview

• Cell Compatibility: 2 x 18650 in series
• Input: USB-C 5V up to 2A
• Output: Boosted to 8.4V for full charge
• Max Charge Current: ~1.1A (for 2A version)
• Protections: Overcharge, overcurrent, short-circuit, thermal
• Status LEDs: Included for charging status feedback
• Recommended Power Source: 5V USB Type-C power supply (not compatible with PD chargers)

Typical Dimensions & Usage

• Approximate size: 39 × 18 × 6 mm
• Weight: Around 5g
• Operating temperature: –40°C to +85°C
• Suitable for DIY power banks, battery packs, and portable electronics 

Important Notes:

• Use a standard 5V USB-C power supply. Avoid using USB Power Delivery (PD) chargers that may require voltage negotiation.
• When connecting two cells in series, ensure the cells are properly balanced to maintain charging efficiency and battery safety.
• Ideal for DIY power bank projects, portable chargers, and custom lithium battery applications.