3S 20A BMS Battery Protection Board - 12.6V Li-ion

3S 20A BMS — 3-Cell Lithium Battery Protection Board

A compact and reliable Battery Management System (BMS) designed for 3-cell series lithium-ion battery packs. Rated at 20A continuous current with support for 8.4V, 12.6V configurations, this board provides essential protection for your battery pack against overcharge, over-discharge, and short circuits.

Key Features

• 3S Configuration — supports 3 lithium cells in series
• 20A Continuous Discharge Current
• Voltage Range: 8.4V / 12.6V (per cell: 4.2V)
• Overcharge, over-discharge, and short circuit protection
• Overcurrent protection with auto-recovery
• Compact PCB form factor — easy to integrate into battery packs
• High-quality MOSFETs for efficient switching

Specifications

• Cell Configuration: 3S (3 cells in series)
• Max Continuous Current: 20A
• Charging Voltage: 12.6V
• Nominal Voltage: 11.1V
• Cell Voltage: 4.2V per cell

Ideal For

• DIY lithium battery packs
• E-bikes, power tools, and solar storage
• Robotics and electronics projects