18650 Lithium Battery Protection Board BMS 4S | Overcharge & Short-Circuit Protection

Product Overview

The 18650 Lithium Battery Protection Board (BMS) is designed to safeguard multi-cell lithium-ion battery packs by continuously monitoring voltage and current. It ensures safe, stable, and long-lasting battery operation, making it ideal for DIY battery packs, power banks, robotics, and energy storage applications.

This BMS is available in multiple variants to match different battery pack configurations and must be selected according to the exact number of cells connected in series.

Available Variants

Choose the correct version based on your battery pack:

• 4S – 4 × 18650 cells (14.8V nominal)

⚠️ Each BMS supports series (S) connections only and must match the exact cell count.

Protection Functions

This protection board includes essential safety features:

• Overcharge Protection – Prevents damage from excessive charging
• Over-Discharge Protection – Protects cells from deep discharge
• Overcurrent Protection – Limits excessive current flow
• Short-Circuit Protection – Instantly cuts off power during faults

These features help extend battery lifespan, prevent overheating, and reduce safety risks.

Applications

• DIY lithium battery packs
• Power banks & backup batteries
• Robotics & electronics projects
• Portable energy systems