3S 12.6V 2A 18650 Lithium Battery Charger Module Type-C – 3S Li-Ion Charging & Balancing Board

Product Description

The 3S 12.6V 2A 18650 Lithium Battery Charger Module is a compact and efficient charging solution designed specifically for 3-cell lithium-ion battery packs connected in series (3S). It provides a regulated charging voltage of 12.6V DC and a charging current of up to 2A, making it suitable for DIY battery packs, robotics, portable electronics, RC applications, and other rechargeable power systems.

The module features a convenient USB Type-C input, providing an easy connection to compatible 5V USB power sources. Its small size makes it suitable for space-constrained electronic projects where a compact charging solution is required.

The charger module supports automatic cell balancing, helping maintain more consistent voltage levels between the three series-connected lithium-ion cells during charging. It also includes overcharge protection to help safeguard the battery pack when the module is used correctly with compatible cells.

Onboard LED indicators provide a simple visual indication of charging status. The Red LED indicates charging activity, while the Green LED indicates that the charging process has been completed.

With its compact 25 × 18 × 6 mm form factor and approximately 6 g weight, the module is suitable for lightweight portable applications, custom battery packs, RC vehicles, drones, embedded systems, and DIY power projects.

Features

• 3S lithium-ion battery charger module
• Designed for 3 × 18650 cells connected in series
• 12.6V DC charging output
• Up to 2A charging current
• 5V DC USB Type-C input
• Automatic cell balancing
• Overcharge protection
• Red and green charging status LEDs
• Compact 25 × 18 mm PCB design
• Approximately 6 g lightweight construction
• Suitable for space-constrained projects
• Ideal for DIY rechargeable battery packs
• Suitable for robotics and RC applications
• Useful for portable electronics
• Suitable for embedded and IoT projects

Specifications

Working Principle

The charger module receives 5V DC power through the USB Type-C input and manages the charging process for a 3S lithium-ion battery pack.

A 3S battery pack consists of three lithium-ion cells connected in series. The combined fully charged voltage of a typical 3S lithium-ion pack is 12.6V, with each individual cell reaching approximately 4.2V when fully charged.

During charging, the module regulates the charging process and supports cell balancing to help keep the voltage of the three series-connected cells more consistent.

The integrated protection circuitry helps protect the battery pack against overcharging when the module is operated correctly and used with compatible cells.

LED Status Indication

The onboard LEDs provide a simple visual indication of the charging condition:

• Red LED: Charging in progress
• Green LED: Charging completed / full-charge indication

LED behaviour may vary slightly depending on the module version and operating condition.

Battery Configuration

This module is designed for a 3S lithium-ion battery configuration, meaning three cells are connected in series.

A typical 3S pack is arranged as:

Cell 1 + Cell 2 + Cell 3 = 3S Battery Pack

A typical 3S lithium-ion pack has a nominal voltage of approximately 11.1V and a fully charged voltage of approximately 12.6V.

For reliable and safer operation, use three suitable cells with matching specifications and similar condition.

Typical Application Scenarios

Robotics and IoT

Suitable for charging 3S lithium-ion battery packs used in robots, autonomous systems, remote sensor nodes, and portable IoT equipment.

DIY Power Solutions

Useful for creating custom rechargeable 12.6V battery systems, portable power sources, backup supplies, and experimental electronics.

Portable Electronics

The compact size makes the module suitable for handheld devices, portable instruments, testing equipment, and other battery-powered electronics.

RC and Lightweight Applications

Its low weight and compact form factor make it suitable for RC vehicles, small drones, robotics platforms, and other weight-sensitive projects.

Applications

• 3S 18650 battery pack charging
• DIY lithium-ion battery packs
• Robotics projects
• RC vehicles
• Drone projects
• Portable electronics
• Embedded systems
• IoT devices
• Battery-powered equipment
• Custom rechargeable power systems
• Portable power banks
• Backup power projects
• DIY electronics
• Automation systems
• Lightweight battery applications

Package Includes

• 1 × 3S 12.6V 2A 18650 Lithium Battery Charger Module Type-C

Product Disclaimer

Product images are shown for illustrative and representational purposes only. The actual module may vary slightly in PCB colour, component placement, connector design, LED position, dimensions, or labeling depending on the manufacturing batch or supplier.

The 18650 battery cells, battery holder, USB Type-C cable, power adapter, enclosure, and other accessories shown in product images are not included unless specifically mentioned in the package contents.

This module is intended for compatible 3S lithium-ion battery packs. Incorrect battery configuration, reversed polarity, damaged cells, unsuitable power sources, improper wiring, or misuse can cause overheating, battery damage, fire, or other hazards.

Important Safety Notes

• Use only compatible 3S lithium-ion battery packs.
• Use three cells with matching capacity, type, model, age, and condition.
• Check battery polarity carefully before connecting the pack.
• Do not use damaged, swollen, leaking, or physically compromised lithium-ion cells.
• Do not short-circuit the battery or charging module.
• Use a suitable 5V USB power source capable of supplying sufficient current.
• Do not leave lithium-ion batteries charging unattended.
• Provide suitable insulation and protection when installing the module in a permanent enclosure.
• Follow the battery manufacturer’s charging and safety instructions.

Input Power Requirements

The module is designed to receive 5V DC through the USB Type-C interface. The connected USB power source should be capable of supplying sufficient current for the intended charging operation.

A suitable cable and power source should be used to achieve stable charging performance, especially when charging at higher current levels.

Storage and Handling

Keep the charging module clean and dry and avoid exposure to excessive heat, moisture, or conductive materials.

When assembling a battery pack, ensure that all connections are properly insulated and securely connected. Incorrect wiring can damage the module or battery cells.

Recommended Related Products

Explore relevant alternatives and complementary products selected from the full Robosap catalogue.

• 4S 16.8V 2A 18650 Lithium Battery Charger Module (USB Type-C)
• B3 Compact Charger for 2S-3S LiPo Battery
• TP4056 1A Lithium Ion Battery Charging Module Mini USB
• Tp4056 1A Lithium Battery Charging Protection Board Module Type C Usb Interface To 4.2V
• TP5100 Dual/Single 8.4V/4.2V Li-ion Battery Charging Module