1S 3.7V 9A 6MOS BMS Li-ion 18650 Battery Protection Board

The 1S 9A 6-MOS BMS (Battery Management System) is a compact protection circuit designed for single lithium-ion or lithium-polymer cells. It continuously monitors battery voltage and current and disconnects the load or charger during unsafe conditions. The use of six parallel MOSFETs reduces internal resistance, improves efficiency, and enhances current-handling capability in compact battery-powered systems.

Technical Specifications:

• Battery configuration: 1S (single cell)
  
• Battery type: Li-ion / Li-polymer
  
• Nominal voltage: 3.6–3.7 V
  
• Maximum charge voltage: 4.25 ± 0.05 V
  
• Over-discharge voltage: 2.5 ± 0.1 V
  
• Continuous discharge current: 9 A
  
• Peak / short-circuit current: 15–20 A (typical)
  
• MOSFET count: 6 (parallel)
  
• Charging current: up to 4–5 A (depending on cooling)
  
• Quiescent current: < 30 µA
  
• Operating temperature: −40 °C to +85 °C
  
• Board type: single-cell protection PCB

Features:

• Over-charge protection
  
• Over-discharge protection
  
• Over-current protection
  
• Short-circuit protection
  
• Automatic fault recovery
  
• Low internal resistance design
  
• Compact size
  
• High reliability using multiple MOSFETs

Applications:

• Single-cell 18650 / 21700 battery packs
  
• Power banks
  
• Portable electronic devices
  
• DIY lithium battery packs
  
• LED lighting systems
  
• Small DC motors and tools
  
• Backup power modules