Type-C 2S 3S 4S Boost Battery Charger Module – 8.4V/12.6V/16.8V 18650 Charging Board

📋 Overview

This compact USB Type-C charging module steps up a standard 5V USB power source to properly charge multi-cell 18650 lithium-ion battery packs. Choose the variant that matches your battery configuration — 2-Cell (2S) for 8.4V packs, 3-Cell (3S) for 12.6V packs, or 4-Cell (4S) for 16.8V packs — and this board will safely boost-convert and charge at up to 2A. It's a simple, drop-in solution for DIY battery packs, portable power projects, and battery pack repairs.

⭐ Key Features

• USB Type-C input — works with any standard 5V phone charger, power bank, or USB power supply
• Boost-converts low input voltage up to the correct charging voltage for your battery pack
• Three variants available: 2S (8.4V), 3S (12.6V), and 4S (16.8V)
• 2 Amp charging input current version for faster charging
• Built-in battery overvoltage protection
• Protection against battery voltage being lower than input, and against short circuit
• Good adaptability to input power sources with limited driving capability
• Dual LED status indicators — "CR" shows active charging, "OK" shows fully charged / constant voltage mode
• Ultra-compact size, easy to integrate into custom battery pack enclosures

⚠️ Factory-Configured — Not User Adjustable: This module is factory-configured for a specific 18650 cell count (2S, 3S, or 4S) and its matching charging voltage (8.4V, 12.6V, or 16.8V). This setting is fixed at the factory and cannot be changed by the user. Be sure to select the variant that matches your battery pack's series cell count — connecting a pack with a different cell count than the module is configured for can result in incorrect charging voltage and damage to your battery pack.

📦 What's in the Box

• 1x Type-C Multi-Cell Boost Battery Charger Module (2S, 3S, or 4S — per selected variant)

Battery cells, wiring, USB-C cable, and power source are not included.

📊 Specifications

🔌 Compatible With

• 18650 lithium-ion cells wired in 2S, 3S, or 4S series configurations
• Standard USB Type-C 5V chargers, power banks, and USB power supplies
• Custom DIY battery packs for flashlights, portable speakers, power tools, and similar projects

🎯 Applications

• Building and charging custom multi-cell 18650 battery packs
• Portable power stations and backup battery builds
• Repairing or upgrading multi-cell battery packs in existing devices
• Electronics hobbyist and maker battery projects

💡 Tip: Be sure to select the variant that matches your battery pack's cell count — 2S, 3S, or 4S. Using the wrong variant will result in incorrect charging voltage for your pack. Full wiring and setup instructions are available in our companion User Guide (linked below).

📄 Documentation & Resources

• User Guide: Type-C 2S/3S/4S Boost Battery Charger Module User Guide
• Category Guide: All Battery Charging Module Guides

Sold and supported by Envistia Mall. This product ships from our US warehouse. For wiring diagrams, setup steps, and safety notes, please see the linked User Guide above. Envistia Mall is not liable for damage resulting from improper wiring, incorrect variant selection, or use of incompatible battery cells. Always follow proper lithium battery handling and charging safety practices. Specifications are provided by the manufacturer and may vary slightly by production batch.