2S-4A  18650 Polymer Lithium Ion Fast Charger Type C to 2S 8.4V 4A Booster Module

Description:

The 2S-4A 18650 Polymer Lithium-Ion Charger Module is a compact battery charging and boost module designed for 2S lithium-ion battery packs. It accepts power through a convenient USB Type-C input and is designed to charge a 2S battery configuration to approximately 8.4V.

The module supports commonly used 3.7V Li-ion cells, including 18650 and 14500 batteries, when configured as a suitable 2S pack. It provides up to 4A charging current according to the product listing and includes built-in protection features intended to improve battery and module safety.

Its compact design makes it suitable for DIY electronics, portable power projects, battery packs, and other rechargeable lithium-ion applications.

Specifications:

• Module Type: 2S Li-ion Charger / Booster Module
• Battery TypeLi-ion / Polymer Lithium-ion
• Compatible Cells: 18650, 14500 and similar 3.7V Li-ion cells
• Battery Configuration: 2S
• Nominal Battery Voltage: 7.4V
• Maximum Charging Voltage: 8.4V
• Charging Current: Up to 4A
• Input Connector: USB Type-C
• Input Power: Type-C power source
• Protection: Overcharge, over-discharge and short-circuit protection
• Indicators: LED status indicators
• Design: Compact PCB module
• Application: DIY battery packs and portable electronics

Features:

• 2S lithium-ion battery support – Designed for two Li-ion cells connected in series.
• 8.4V charging output – Suitable for charging a 2S Li-ion battery pack.
• Up to 4A charging current – Provides high-current charging capability when used with an appropriate power supply and battery pack.
• USB Type-C input – Convenient and widely available charging interface.
• Battery protection – Includes protection against overcharge, over-discharge and short circuits.
• LED indicators – Provides visual charging/status indication.
• Compact PCB design – Easy to integrate into DIY electronics and portable projects.
• High efficiency – Designed for efficient power conversion and charging.
• Wide battery compatibility – Suitable for compatible 3.7V Li-ion cells such as 18650 and 14500.
• Easy to integrate – Useful for custom battery-powered electronics and portable devices.

🔌 How to Connect the Pins

• VIN+ / VIN-: Where you can solder a 5V power source directly if you do not want to use the USB port.
• BAT+: Connects to the Positive (+) terminal of your 3S battery pack.
• BAT- / GND: Connects to the Negative (-) terminal of your 3S battery pack.

⚠️ Crucial Safety Note:

Most basic 2S booster modules do not balance the individual battery cells. To prevent fire risks and extend battery life, you must connect a 2S BMS (Battery Management System) board directly to your cells, and then connect this booster module to the BMS input