4S 20A 14.8V Cell 18650 Li-ion Lithium Battery Balanced Charging BMS PCB Board with Protection

The BMS 4S 18650 Battery Protection Board is a reliable 20A 14.8V–16.8V charger protection module designed for 4S lithium-ion battery packs. It safeguards your batteries against overcharge, over-discharge, short circuits, and overheating, ensuring longer battery life and stable performance. This protection board is ideal for DIY electronics, backup power systems, small inverters, and solar-powered projects where safe battery management is essential.

Key Features

• Compact and space-saving design for easy integration, making it suitable for tight enclosures and portable devices
• Clear and simple wiring layout for hassle-free installation
• Specifically engineered to protect 4S Li-ion battery packs
• Supports custom installation options for various electronics and power systems
• Short-circuit protection with automatic charge recovery for enhanced safety
• Long-life operation (50,000+ hours) with low internal resistance (<100mΩ) for efficient power delivery

Technical Parameters

• Model: HX-4S-D20
• Voltage Range: 4.25–4.35V ±0.05V per cell
• Charging Voltage: 16.8V–17V
• Upper Working Current: 10A, Maximum Instantaneous Current: 20A
• Operating Temperature: -40°C to +50°C, Storage Temperature: -40°C to +80°C
• Static Current: <30uA, Internal Resistance: <100mΩ
• Controller: S-8254AA for 4-cell series protection

Installation Instructions

Follow the wiring diagram carefully: 0V (B-), 3.7V (B1), 7.4V (B2), 11.1V (B3), 14.8V (B+). Ensure all cells are charged to the same voltage before connecting. Avoid mixing old and new cells to maintain performance and extend battery lifespan.

Important Cautions

• Not suitable for LiFePO4 batteries, high-current motors above 4A, hernia lamp packs, or e-bike battery packs.
• For discharge loads above 3A, ensure the battery supports a discharge rate of at least 3C.
• Follow the battery multiplier formula to avoid overload (example: 2000mAh × 1C = 2A maximum recommended working current).

Applications

• Small power inverters
• Massager and handheld device battery packs
• LED lamp and emergency lighting backup power
• General electronics and DIY battery projects
• Solar street lamp battery packs
• Security, monitoring, and standby power systems

Why Choose This BMS 4S?

The BMS 4S 18650 Battery Protection Board offers dependable protection, long lifespan, and stable performance for 4S lithium-ion battery packs. Its advanced control IC, safety features, and efficient design make it an essential component for any battery-powered project. Check the BMS price in Pakistan and get the best value for upgrading your power systems today!