2S 8.4V 20A Li-ion BMS Protection Board

The 2S 8.4V 20A Li-ion BMS Protection Board is a Battery Management System (BMS) designed for 2-series (2S) 3.7V Lithium-Ion (Li-ion) or Lithium Polymer (Li-Po) battery packs. It provides overcharge, over-discharge, overcurrent, and short-circuit protection, ensuring safe charging and discharging of the battery pack. This module is ideal for DIY battery packs, portable speakers, robotics, LED lighting, power tools, UPS systems, and portable electronic devices.

Features

• Full Name: 2S 8.4V 20A Lithium-Ion Battery Management System (BMS)
• Designed for 2S Li-ion/Li-Po battery packs
• Supports 2 × 3.7V cells in series
• Built-in overcharge protection
• Over-discharge protection
• Overcurrent protection
• Short-circuit protection
• Compact PCB design
• Low standby power consumption
• Easy wiring and installation

Specifications

Pin Configuration

Note: Connect the battery terminals in the correct sequence (B− → B1 → B+) before connecting the charger or load. Incorrect wiring may permanently damage the BMS.

Applications

• 2S 7.4V Li-ion battery packs
• DIY battery packs
• Portable Bluetooth speakers
• Robotics
• Power tools
• LED lighting systems
• UPS and backup power systems
• Portable electronic devices
• DIY electronics projects

Advantages

• Comprehensive battery protection
• Prevents overcharging and deep discharge
• Protects against overcurrent and short circuits
• Extends battery life
• Compact and lightweight
• Reliable performance
• Easy to install

Size

Package Includes

• 1 × 2S 8.4V 20A Li-ion BMS Protection Board

Note: This BMS is designed only for 2S (7.4V nominal / 8.4V fully charged) Li-ion or Li-Po battery packs using 3.7V cells. It is not compatible with LiFePO₄ (3.2V) batteries. Always use a compatible 8.4V Li-ion charger, verify all wiring before connecting the battery pack, and avoid exceeding the 20A continuous discharge rating for safe and reliable operation.