4S 4A Type-C Lithium Battery Boost Charger Module 16.8V

The 4S 4A Type-C Lithium Battery Boost Charger Module is a compact DC-DC step-up charging board designed for recharging four lithium-ion or lithium-polymer cells connected in series.

The module converts a low-voltage DC input of 3V to 6V into a controlled 16.8V charging output suitable for standard 4S lithium battery packs.

Featuring a USB Type-C connector, alternative DC input solder pads, charging status indicators and dedicated battery connection terminals, it offers a practical charging solution for custom rechargeable electronics, robotics and battery-powered equipment.

Key Features

• 4S Lithium Battery Charging: Designed for four lithium cells connected in series.
• 16.8V Charging Voltage: Suitable for 14.8V nominal lithium-ion battery packs.
• DC-DC Boost Conversion: Increases a 3-6V input supply to the required battery charging voltage.
• USB Type-C Input: Convenient connection to a suitable DC power source.
• 4A Input Version: Designed for up to 4A input current under appropriate supply conditions.
• Approximately 1.12A Charging Current: Specified charging current for the selected 4S/4A configuration.
• Charging Indicators: CR and OK indicators provide charging status information.
• Automatic Recharge: Supports automatic charging restart according to the controller’s operating conditions.
• Compact PCB: Suitable for integration into rechargeable electronic devices and project enclosures.

Technical Specifications

Applications

1. Rechargeable 18650 Battery Packs

Charge four compatible 18650 lithium-ion cells connected in series, providing a 14.8V nominal battery pack with a fully charged voltage of 16.8V.

DIYGH stocks 18650 3.7V 2500mAh Rechargeable Lithium Batteries for suitable rechargeable electronics projects.

2. Robotics and Automation Projects

Integrate charging functionality into robotics systems, portable controllers and other equipment using compatible 4S lithium battery packs.

3. Portable Electronic Equipment

Useful in custom rechargeable electronic devices that require a four-series lithium battery arrangement.

4. DIY Rechargeable Power Systems

Build compact battery-charging arrangements for experimental power systems, portable electronics and educational engineering projects.

5. Battery Charging and Electronics Education

Demonstrate DC-DC boost conversion, series-connected lithium batteries, charging voltage regulation and battery management principles.

Battery Configuration

This selected module is configured for 4S charging.

Four standard 3.7V nominal lithium-ion cells connected in series provide:

• Nominal pack voltage: 14.8V
• Maximum charging voltage: 16.8V
• Specified charging current: Approximately 1.12A with a suitable input supply

The 4A specification identifies the module’s input-current version, not a 4A battery charging output.

Input and Battery Connections

The module provides a USB Type-C input and solder pads for integrating it into an electronic system.

• USB Type-C: Accepts a compatible low-voltage DC charging supply.
• VIN / GND: Alternative DC input connections.
• BAT / GND: Charging output connections to a compatible protected 4S battery pack.

Before connecting a battery, identify the correct positive and negative terminals and verify the charging voltage.

A suitable multimeter, such as the ANENG XL830L Digital Multimeter, can be used to check voltage and polarity.

Important: Use a 4S Battery Management System

This charging module does not replace a full battery management system.

A suitable 4S BMS provides cell-level monitoring and protection against conditions such as overcharging, excessive discharge and overcurrent.

For compatible lithium battery projects, DIYGH stocks the 4S 40A 18650 Lithium Battery BMS.

Always follow the BMS manufacturer’s wiring instructions and connect the charger through the BMS’s designated charging terminals.

Charging Status Indicators

The module includes two status indicators:

• CR: Charging is in progress.
• OK: Indicates the controller’s constant-voltage or charged status.

The OK indication should be interpreted according to the charging controller’s operating state rather than being used as the only method of verifying battery condition.

Important Usage Information

• Use only with suitable four-series 3.6V/3.7V nominal Li-ion or LiPo battery packs.
• Do not use for 4S LiFePO4 batteries, which require a different charging voltage.
• Use a correctly matched 4S BMS for cell protection.
• Provide a stable DC power source within the module’s specified input voltage range.
• Full-rated operation requires an input supply and cable capable of providing the necessary current. An ordinary USB-C phone charger may not provide 4A at 5V.
• Do not connect the battery directly to the USB Type-C input.
• Verify all connections and polarity before charging.
• Do not charge damaged, swollen or mismatched lithium cells.
• Avoid unattended charging and place the battery assembly in a suitable fire-resistant environment.
• Do not treat the 4A input rating as 4A charging current.

Package Includes

1 x 4S 4A Type-C Lithium Battery Boost Charger Module 16.8V

Battery cells, USB cable, power adapter and BMS are not included.

Available from DIYGH Tech Hub, Apatrapa Junction, Kumasi, Ghana.