4S/100A BMS Module

The 4S 100A BMS (Battery Management System) module is a high-current protection and balancing board designed for 4-series lithium battery packs (Li-ion or LiFePO₄ depending on version). It manages charging and discharging safely by monitoring individual cell voltages, controlling high current flow, and protecting the battery pack from abnormal operating conditions. This type of BMS is commonly used in high-power applications where large discharge currents are required.

Technical Specifications:

• Battery configuration: 4S (4 cells in series)
• Nominal battery voltage: 14.8 V (Li-ion) / 12.8 V (LiFePO₄, model dependent)
• Maximum continuous discharge current: up to 100 A
• Charge current: typically up to 50–100 A (model dependent)
• Overcharge protection voltage: ~4.25 V per cell (Li-ion)
• Over-discharge protection voltage: ~2.5–2.8 V per cell
• Overcurrent and short-circuit protection: supported
• Cell balancing: passive balancing
• MOSFETs: multiple parallel high-current MOSFETs
• Connection points: B+, B-, B1, B2, B3, P+, P- (varies by layout)

Features:

• Supports very high discharge current for power-hungry loads
• Overcharge, over-discharge, overcurrent, and short-circuit protection
• Passive cell balancing improves battery life and pack consistency
• Low internal resistance for minimal power loss
• Robust PCB with heavy copper traces
• Designed for lithium battery safety and reliability

Applications:

• Electric scooters and e-bikes
• High-power DIY battery packs
• Solar energy storage systems
• Inverters and UPS systems
• Power tools and robotics
• Energy storage and backup power solutions