LifePo4 Lithium Battery Active Balancing Module (BMS) 3-4S 1.2A
The LifePo4 Lithium Battery Active Balancing Module 3–4S is designed to maintain balanced voltage levels across lithium-ion battery cells connected in 3S or 4S configurations. It monitors individual cell voltages and helps correct voltage differences that develop during charging and discharging, allowing the battery pack to operate more consistently and utilize its available capacity efficiently.
Using active energy-transfer technology, the module transfers energy from higher-voltage cells to lower-voltage cells with a balancing current of up to 1.2A. Unlike passive balancing circuits that dissipate excess energy as heat, active balancing helps reduce energy waste and improve battery efficiency. It is suitable for custom battery pack assembly, portable power systems, robotics, and other applications requiring balanced LifePo4 lithium-ion battery cells.
Features:
- Active cell-to-cell energy transfer.
- Supports multiple battery configurations.
- Helps maintain balanced cell voltages.
- Reduces voltage differences between individual cells.
- Improves battery capacity utilization.
- Minimizes energy loss during balancing.
- Helps maintain consistent battery performance.
- Compact PCB design for battery pack integration.
Specifications:
| Parameter | Value |
|---|---|
| Product Type | Active Battery Balancing Module |
| Battery Chemistry | LifePo4 Lithium |
| Supported Configurations | 3S / 4S |
| Number of Cells | 3 or 4 Cells in Series |
| Balancing Method | Active Energy Transfer |
| Maximum Balancing Current | 1.2A |
| Nominal Cell Voltage | 3.7V |
| Maximum Cell Voltage | 4.2V |
| Nominal Voltage (3S) | 11.1V |
| Maximum Charging Voltage (3S) | 12.6V |
| Nominal Voltage (4S) | 14.8V |
| Maximum Charging Voltage (4S) | 16.8V |
| Connection Type | Cell Balance Connections |
Pinout:
| Pin | Connection |
|---|---|
| B- | Battery pack negative |
| B1 | Positive terminal of Cell 1 |
| B2 | Positive terminal of Cell 2 |
| B3 | Positive terminal of Cell 3 |
| B4 | Positive terminal of Cell 4 |
Applications:
- 18650 LifePo4 lithium-ion battery packs.
- 21700 LifePo4 lithium-ion battery assemblies.
- Portable power stations.
- DIY rechargeable battery packs.
- Robotics and autonomous projects.
- Electric bicycles and scooters.
- Solar battery storage systems.
- Custom battery management systems.
Packages Included:
- 1 × LifePo4 Lithium Battery Active Balancing Module (BMS) 3-4S 1.2A.
- 1 × AWG Wiring.
