Specifications:

• Item Type: BMS Module
• Series Support: 2S (2 × 3.7V Li-ion / NMC Cells)
• Nominal Voltage: 7.4V
• Charging Voltage: 8.4V
• Continuous Current: 4A
• Overcharge Limit: ~4.25V ± 0.05V
• Over-discharge Limit: ~2.5V ± 0.1V
• Short Circuit Delay: < 1.5 ms
• Protection Features: Overcharge, Over-discharge, Overcurrent, Short Circuit

Features:

• Supports 2S (7.4V) Li-ion/NMC battery packs
• 4A continuous discharge capacity
• Advanced multi-protection safety system
• Overcharge and over-discharge protection
• Short circuit and overcurrent protection
• Compact and lightweight PCB design
• Stable voltage and current output
• Easy integration with nickel strip support

BMS 2S 4A 3.7V 18650 Li-ion Lithium Battery Protection Board is a compact and efficient protection module designed for 2-cell lithium-ion battery packs. Engineered for reliability, it ensures safe operation with built-in protection against overcharge, over-discharge, overcurrent, and short circuits. Supporting up to 4A continuous current, it is suitable for light to moderate applications such as portable electronics, DIY battery packs, and IoT devices. The durable PCB design offers stable performance and efficient heat control, making it ideal for long-term usage. With its small form factor and easy integration, this BMS enhances battery life while maintaining consistent output. It is widely used in power banks, LED systems, and compact energy storage solutions.