4S 40A BMS Protection Board for 18650 Li-ion Battery Pack – With Balance Charging and Protection

Description

The 4S 40A BMS Battery Protection Board is a compact and essential module for building or repairing 4-series lithium battery packs. It is specifically designed for 4S battery configurations made from 18650 lithium-ion cells, including standard Li-ion, LMO, and ternary lithium batteries. This BMS board protects your battery pack against overcharge, over-discharge, over-current, short circuit, and cell imbalance. Integrated balance charging circuitry ensures that all four cells maintain nearly equal voltage during charging, improving battery performance, safety, and lifespan. With support for up to 40A continuous discharge current, this board is suitable for high-power applications such as ele

Key Features

• Designed for 4S lithium battery packs
• Compatible with 18650 Li-ion, LMO, and ternary lithium cells
• Supports up to 40A continuous current
• Built-in balance charging function
• Overcharge protection
• Over-discharge protection
• Over-current protection
• Short circuit protection
• Cell balancing improves battery lifespan
• Compact and easy to install
• Suitable for DIY and commercial battery packs