4S 16.8V 2A 18650 Lithium Battery Charger Module (USB Type-C)

4S 16.8V 2A 18650 Lithium Battery Charger Module Type-C – 4S Li-Ion Battery Charging & Balancing Board

Product Description

The 4S 16.8V 2A 18650 Lithium Battery Charger Module is a compact and practical charging solution designed for 4-cell lithium-ion battery packs connected in series (4S). It provides a regulated charging voltage of 16.8V DC and a charging current of up to 2A, making it suitable for DIY battery packs, portable electronics, robotics, and other rechargeable lithium-ion applications.

The module features a convenient USB Type-C input, allowing it to be connected to compatible Type-C power sources and cables. Its compact design makes it easy to integrate into custom battery-powered projects where an onboard charging solution is required.

The charging module is designed to support automatic charging and cell balancing for a 4S lithium-ion battery pack. Balancing helps maintain more consistent voltage levels between the series-connected cells during the charging process.

Built-in charging protection features help reduce the risk of battery overcharging when the module is used correctly with compatible cells and a suitable power source. The module also includes LED indicators that provide a simple visual indication of the charging status.

Features

• 4S lithium-ion battery charger module
• Designed for 4 × 18650 cells connected in series
• 16.8V DC charging output
• Up to 2A charging current
• USB Type-C input interface
• Automatic charging function
• Cell balancing support
• Overcharge protection
• Compact and lightweight design
• LED charging status indication
• Red LED for charging indication
• Green LED for full-charge indication
• Suitable for DIY battery pack projects
• Ideal for portable electronics and robotics
• Easy to integrate into custom power systems

Specifications

Parameter	Specification
Product Type	4S Lithium-Ion Battery Charger Module
Battery Type	Lithium-Ion
Battery Configuration	4S
Compatible Cells	4 × 18650 Li-Ion Cells in Series
Input Interface	USB Type-C
Charging Voltage	16.8V DC
Charging Current	2A
Charging Method	Automatic Charging
Balancing	Supported
Protection	Overcharge Protection
Charging Indicator	Red LED
Full Charge Indicator	Green LED
Application	4S Li-Ion Battery Packs

Working Principle

The charger module receives power through its USB Type-C input and provides a controlled charging voltage for a 4S lithium-ion battery pack.

A 4S battery pack consists of four lithium-ion cells connected in series. The combined fully charged voltage of the pack is approximately 16.8V, with each cell reaching approximately 4.2V when fully charged.

During charging, the module controls the charging process and supports balancing between the series-connected cells. Cell balancing helps reduce differences in cell voltage and supports more consistent charging of the battery pack.

The module’s protection circuitry is intended to help prevent overcharging when used with compatible batteries and within the module’s specified operating conditions.

LED Status Indication

The onboard LEDs provide a simple way to monitor the charging process:

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

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

Battery Configuration

This module is designed specifically for a 4S lithium-ion battery configuration, meaning four cells are connected in series.

A typical 4S pack is arranged as:

Cell 1 + Cell 2 + Cell 3 + Cell 4 = 4S Battery Pack

The nominal battery voltage of a 4S lithium-ion pack is approximately 14.8V, while the fully charged voltage is approximately 16.8V.

The cells used in the battery pack should be suitable for series connection and should be properly matched for safe and reliable operation.

Typical Application Scenarios

DIY Battery Packs

Suitable for building rechargeable 4S lithium-ion battery packs for portable equipment, custom electronics, and DIY power systems.

Robotics

Can be integrated into robotic systems that use 4S lithium-ion battery packs for motors, controllers, sensors, and other electronics.

Portable Electronics

Useful for custom portable electronic devices requiring rechargeable 4S lithium-ion power systems.

Embedded Systems

Can be integrated into suitable embedded and IoT systems requiring an onboard charging solution for a 4S battery pack.

Custom Power Systems

Suitable for DIY power banks, battery-powered tools, mobile equipment, and other compatible rechargeable electronics.

Applications

• 4S 18650 battery pack charging
• DIY lithium-ion battery packs
• Robotics projects
• Drone and RC projects
• Portable electronics
• Embedded systems
• IoT devices
• Battery-powered equipment
• Custom rechargeable power systems
• DIY electronics projects
• Mobile monitoring systems
• Portable instruments
• Custom automation projects

Package Includes

• 1 × 4S 16.8V 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.

The 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 designed for compatible 4S lithium-ion battery packs. Incorrect battery configuration, improper wiring, damaged cells, unsuitable power sources, or misuse can result in overheating, battery damage, fire, or other hazards.

Important Safety Notes

• Use only compatible 4S lithium-ion battery packs.
• Use four cells that are properly matched in capacity, type, condition, and state of charge.
• For best results, use cells of the same brand, model, capacity, and age.
• Check cell polarity carefully before connecting the battery 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 USB power source capable of providing the required charging input.
• Do not leave lithium-ion batteries charging unattended.
• Use appropriate insulation and enclosure protection when installing the module permanently.
• Follow the battery manufacturer’s charging and safety instructions.

Power Source Requirement

The module uses a USB Type-C input, but the actual input-power requirement depends on the module design and charging conditions. A suitable USB power source should be capable of supplying sufficient power for the intended charging current.

To achieve the intended charging performance, ensure that the connected power source, cable, wiring, and connectors are appropriately rated.

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