1S 3.7V Li-ion LiPo Battery Protection Circuit Module (BMS PCM)

1S 3.7V Li-ion / LiPo Battery Protection Circuit Module (BMS PCM)

Keep your single-cell lithium battery safe with this compact Battery Management System (BMS) / Protection Circuit Module (PCM). Designed for 1S 3.7V Li-ion and LiPo cells, this tiny board guards against the most common causes of battery failure — overcharge, over-discharge, and short circuits — so your projects run reliably and safely.

Whether you're building a DIY power bank, a wearable device, a wireless sensor node, or any battery-powered electronics project, this PCM is an essential safeguard between your battery and your circuit.

Key Features

• Cell Configuration: 1S (Single Cell)
• Battery Voltage: 3.7V Li-ion / LiPo
• Overcharge Protection: Cuts off at ~4.25V
• Over-discharge Protection: Cuts off at ~2.5V
• Short Circuit Protection: Automatic cutoff on short circuit detection
• Overcurrent Protection: Built-in current limiting
• Form Factor: Slim, strip-style PCB — ideal for cylindrical and pouch cells
• Easy Integration: Solder pads for B+/B− (battery) and P+/P− (load/charger)

Typical Applications

• DIY power banks and USB chargers
• Wearable electronics and IoT devices
• RC models and robotics
• Arduino / ESP32 battery-powered projects
• Single-cell 18650 or LiPo pouch cell protection