The 4S 16.8V 40A Li-Ion Cell BMS Charging Protection Module is a powerful Battery Management System (BMS) designed for 4-cell (4S) Lithium-Ion or Lithium Polymer battery packs with a fully charged voltage of 16.8V. With a continuous discharge current capacity of 40A, this module is ideal for medium-to-high power applications such as e-bikes, robotics, solar energy storage, DIY power packs, inverters, and high-drain LED systems.
It provides complete safety during charging and discharging cycles by preventing overcharge, over-discharge, overcurrent, and short-circuit conditions. The built-in cell balancing function ensures equal voltage across all four cells, improving pack performance, efficiency, and overall lifespan.
Technical Working & Protections
- Overcharge Protection: Stops charging when cell voltage exceeds ~4.25V.
- Over-discharge Protection: Cuts off output when voltage drops below ~2.7V per cell.
- Overcurrent Protection: Shuts down discharge when current exceeds ~50–55A peak.
- Short-Circuit Protection: Immediate cutoff prevents damage to battery and load.
- Cell Balancing: Maintains equal charge levels across all 4 cells for stability.
- Automatic Recovery: Resumes operation when conditions normalize without reset.
Key Features & Specifications
- Supports 4S (16.8V) Li-Ion / Li-Po battery packs
- Continuous discharge current: up to 40A
- Peak cutoff current: ~50–55A
- Overcharge cutoff voltage: ~4.25 ±0.05V per cell
- Over-discharge cutoff voltage: ~2.7 ±0.1V per cell
- Built-in cell balancing for longer battery life
- Operating temperature: -20°C to +60°C
- Durable PCB design for medium-high power loads
- Works with CC/CV Li-Ion chargers
Applications
- DIY 16.8V battery packs
- Electric bikes and scooters
- Robotics and automation
- Solar energy storage systems
- LED strips and lighting projects
- Portable power stations & inverters
Note: Images are for Illustration Purposes Only.
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