5S 18.5V BMS 15A/20A LiPo Battery Protection Board with Balance (18650 PCM)

5S 18.5V LiPo BMS Battery Protection Board

Keep your 5-cell lithium battery pack safe and balanced with this dedicated BMS (Battery Management System) module. Designed for 5S 18650 Li-ion / LiPo packs, it provides overcharge, over-discharge, overcurrent, and short-circuit protection — all while actively balancing each cell for maximum capacity and longevity.

Key Features

• 5S (5-cell series) configuration for 18.5V nominal battery packs
• Built-in cell balancing via onboard balance wires (JST connector)
• Overcharge protection per cell: ~4.25V cutoff
• Over-discharge protection per cell: ~2.5V cutoff
• Overcurrent & short-circuit protection
• Continuous discharge current: 15A – 20A
• Compact green PCB with screw-terminal pads for B- and P-
• Pre-wired balance lead harness included
• Suitable for power tools, e-bikes, solar storage, and DIY battery packs

Specifications

• Cell Configuration: 5S (5 cells in series)
• Nominal Voltage: 18.5V
• Max Charge Voltage: 21.0V (4.2V per cell)
• Continuous Current: 15A – 20A
• Overcharge Cutoff: ~4.25V/cell
• Over-discharge Cutoff: ~2.5V/cell
• Balance Function: Yes (passive balancing)
• PCB Color: Green
• Compatible Cells: 18650 Li-ion / LiPo

Applications

• 5S 18650 DIY battery pack assembly
• E-bike and electric scooter battery protection
• Power tool battery replacement
• Solar energy storage systems
• RC and robotics power systems

Package Includes

• 1 × 5S BMS Protection Board
• 1 × Pre-wired Balance Lead Harness