HW-391 20A 2S BMS 8.4V Lithium Battery Protection Board

A high-quality Battery Management System (BMS) designed for 2-series lithium battery packs. Built with precision components and high-grade PCB material to effectively avoid corrosion and wear for long-lasting durability.

Key Specifications

• Model: HW-391
• Charging Voltage: DC 8.4–9V
• Version: Balanced / Standard
• Continuous Discharge Current: Max 20A
• Continuous Charging Current: Max 10A
• Peak Start-up Current: 25A
• Compatible Load: Power drills under 50W or resistive loads up to 168W
• Dimensions: 48mm × 20mm × 4mm
• Weight: 3g

Compatible Batteries

Works with all 3.7V nominal / 4.2V charge lithium batteries including 18650, 26650, and polymer lithium cells.

Features

• Overcharge, over-discharge, and short-circuit protection
• Cell balancing for extended battery life
• Compact and easy to install with precise cuts and interfaces
• High-quality materials for durability and corrosion resistance