4S 20A LiFePO4 BMS 12.8V 14.4V Battery Management System
4S 20A LiFePO4 BMS 12.8V 14.4V Battery Management System
4S 20A LiFePO4 Battery Management System (BMS) – 12.8V / 14.4V
Keep your LiFePO4 battery pack running safely and efficiently with this compact 4S 20A Battery Management System (BMS). Designed for 32650 and 32700 lithium iron phosphate cells, this balanced BMS provides reliable overcharge, over-discharge, over-current, and short-circuit protection — making it an ideal solution for 12V car batteries, electric boats, UPS (Uninterrupted Power Supply) systems, and computer power setups.
Key Features
- Configuration: 4S (4-cell series) | 20A continuous discharge current
- Compatible Voltages: 12.8V (nominal) / 14.4V (fully charged)
- Cell Compatibility: 32650 & 32700 LiFePO4 cells
- Built-in Cell Balancing: Passive balancing keeps all cells at equal charge levels, extending overall battery pack lifespan
- Comprehensive Protections: Overcharge, over-discharge, over-current, and short-circuit protection circuits
- Compact SMD Construction: Surface-mount design for a low-profile, space-saving footprint
- Wide Application Range: Suitable for electric boats, 12V automotive batteries, UPS/backup power supplies, and computer power systems
- Condition: Brand new
- Quantity: 1 BMS board per order
Technical Specifications
| Cell Configuration | 4S (4 cells in series) |
| Continuous Current | 20A |
| Nominal Voltage | 12.8V |
| Charge Voltage | 14.4V |
| Cell Type | LiFePO4 (32650 / 32700) |
| Package Type | SMD |
| Customizable | Yes |
| High-Concern Chemicals | None |
What is a BMS and Why Do You Need One?
A Battery Management System (BMS) is the electronic guardian of your lithium battery pack. It continuously monitors cell voltages, balances charge levels across individual cells, and cuts power in the event of a fault — protecting your cells from damage and your equipment from harm. For any 4S LiFePO4 build, a quality BMS is essential to safe, long-term operation.
Ideal Applications
- DIY 12V LiFePO4 battery packs
- Electric boats & marine applications
- Uninterrupted Power Supply (UPS) systems
- 12V automotive / car battery replacements
- Computer & home backup power
- Solar energy storage projects
Made in Mainland China.
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Frequently Asked Questions
Q: What cell types are compatible with this 4S 20A LiFePO4 BMS?
A: This BMS is specifically designed for 32650 and 32700 LiFePO4 (lithium iron phosphate) cells wired in a 4-series (4S) configuration, producing a nominal pack voltage of 12.8V and a full-charge voltage of 14.4V.
Q: Does this BMS include cell balancing?
A: Yes. This board features built-in passive cell balancing, which helps equalize the charge across all four cells during the charging cycle, improving battery pack longevity and overall performance.
Q: Can I use this BMS for a 12V car battery or marine application?
A: Absolutely. This 4S 20A BMS is well-suited for 12V automotive battery replacements, electric boats, UPS backup systems, and other applications requiring a stable, protected 12.8V LiFePO4 power source rated at up to 20A continuous current.
Q: How many BMS boards come in one order?
A: Each order includes one (1) BMS board. If you need multiple units for larger battery builds, simply adjust the quantity at checkout.