Name: 4S 40A 16.8V Lithium Battery Protection Board BMS Module with Balance - UNIVERSAL CIRCUIT SYSTEM
SKU: UCS-0143
Price: 120.00 BDT
Availability: InStock

High-Current 4S 40A Lithium Battery Protection Board with Balancing

Overview

This heavy-duty 4S 40A Battery Management System (BMS) module is engineered to protect, balance, and manage a 4-cell series configuration of 3.7V lithium-ion or lithium-polymer batteries (such as 18650, 21700, or 26650 cells). Offering a nominal voltage of 14.8V and a full charge voltage of 16.8V, this board delivers the high-current handling necessary for demanding applications while ensuring maximum safety and prolonged battery life.

Integrated Cell Balancing Circuit

Unlike basic protection circuits, this advanced BMS features built-in equalization functionality. As the battery pack nears full charge, the onboard balancing resistors actively bleed off excess voltage from higher cells, allowing weaker cells to catch up. This keeps all four cells tightly synchronized, maximizing the overall usable capacity of your pack and preventing premature battery degradation.

Robust Multi-Layer Hardware Protection

Equipped with a array of high-power MOSFETs and a precise control chipset, this module continuously monitors the electrical status of individual cells to protect against catastrophic failures:

Overcharge Protection: Prevents dangerous over-pressurization and thermal runaway by cutting off charging when any cell reaches its limit.
Over-Discharge Protection: Safely disconnects the load when cells drain too low, preventing irreversible capacity loss.
Overcurrent & Short Circuit Safety: Instantly trips open if an electrical fault or a massive current spike occurs, protecting the wiring and cells.