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

The 2S 8.4V USB Type-C Lithium Battery Charger Module is a compact charging circuit designed for two-cell lithium-ion battery packs, including packs assembled from 18650 rechargeable cells connected in series. It accepts power through a USB Type-C input and uses a step-up charging circuit to provide the voltage required for charging a 2S lithium-ion battery pack.

A standard 2S lithium-ion battery pack has a nominal voltage of 7.4V and a full-charge voltage of 8.4V. The module uses a constant-current/constant-voltage (CC/CV) charging method to regulate the charging process as the battery approaches its full-charge voltage. This makes it suitable for portable electronics, DIY battery assemblies, robotics, and other projects that require a rechargeable 2S power source.

The compact PCB design allows the module to be integrated into custom electronic devices and battery-powered systems. Onboard LED indicators on common versions provide visual feedback about charging activity and completion. Battery and input connections are provided through designated solder pads, allowing straightforward integration into a compatible circuit.

Although this product is marketed as a 2A module, the actual battery charging current depends on the board revision and input conditions. Some versions specify up to 2A input current while delivering a lower charging current to the battery. Verify the exact output-current rating of the supplied board before designing around a particular charging time. (RAM Electronics, Most Electronics)

Features:

• Designed for 2S lithium-ion battery packs

• Compatible with suitable 18650 cells connected in series

• USB Type-C charging input

• Step-up voltage conversion for 8.4V battery charging

• CC/CV lithium-ion charging method

• Compact PCB for embedded applications

• Onboard charging-status indicators on common versions

• Suitable for DIY rechargeable battery systems

• Convenient integration into portable electronic projects

Specifications:

• Product Type: Lithium-Ion Battery Charger Module

• Battery Configuration: 2S, two cells or cell groups connected in series

• Compatible Battery Type: Standard 3.7V nominal lithium-ion cells

• Typical Battery Pack Voltage: 7.4V nominal

• Full-Charge Voltage: 8.4V

• Input Interface: USB Type-C

• Input Voltage: Typically 5V DC

• Advertised Current Rating: 2A; confirm whether this refers to input current or battery charging current for the exact version

• Charging Method: Constant Current / Constant Voltage (CC/CV)

• Voltage Conversion: Step-up boost charging circuit

• Status Indicators: Charging and charge-complete LEDs on common versions

• Mounting and Connection: PCB with solder terminals

Applications:

• 2S 18650 lithium-ion battery packs

• Portable electronic devices

• DIY rechargeable power supplies

• Robotics and mobile robot projects

• Portable speakers and audio devices

• Battery-powered lighting systems

• Embedded electronics prototypes

• Custom battery charging circuits

• Educational electronics projects