4S 8A BMS Li-ion Battery Protection Board – 14.8V Charger Module
4S 8A BMS Li-ion Battery Protection Board – 14.8V Charger Module
4S 8A BMS Polymer Li-ion Battery Protection Board
Keep your 4-series lithium-ion battery pack safe and performing at its best with this compact 4S 8A Battery Management System (BMS) Protection Board. Designed for four 3.7V Li-ion cells wired in series (14.8V nominal), this SMD module guards against overcharge, over-discharge, and overcurrent — making it an essential component for DIY battery packs, e-bike builds, RC projects, portable power stations, and more.
Made in Mainland China.
Key Features
- 4S Configuration: Optimised for 4 serial 3.7V Li-ion / polymer cells (14.8V total)
- 8A Continuous Current: Handles up to 8A charge and discharge current
- Multi-Layer Protection: Overcharge protection, over-discharge protection, overcurrent protection, and short-circuit cut-off
- Wide Operating Temperature: Rated from -40°C to +85°C for reliable operation across environments
- SMD Package: Compact surface-mount design for easy integration into custom battery assemblies
- Voltage Regulator Type: Maintains stable cell balance and pack voltage
- No High-Concern Chemicals: Free from restricted hazardous substances
- New Condition: Brand-new unit, quantity 1 per order
Specifications
| Configuration | 4S (4 cells in series) |
| Cell Voltage | 3.7V per cell (14.8V pack) |
| Continuous Current | 8A |
| Package Type | SMD |
| Operating Temperature | -40°C to +85°C |
| Compatibility | Polymer Li-ion batteries |
| Country of Origin | Mainland China |
Common Applications
- DIY lithium battery packs
- E-bikes and electric scooters
- RC vehicles and drones
- Portable power banks and power stations
- Laptop and computer battery assemblies
- Solar energy storage systems
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Frequently Asked Questions
Q: What does a 4S BMS protection board do?
A: A 4S Battery Management System (BMS) protection board monitors and manages four lithium-ion cells connected in series. It prevents overcharging, over-discharging, overcurrent draw, and short circuits — protecting both the battery cells and connected devices from damage and extending overall pack lifespan.
Q: Is this BMS board compatible with all 3.7V Li-ion batteries?
A: Yes, this board is designed specifically for standard 3.7V nominal lithium-ion and lithium polymer (LiPo) cells arranged in a 4-series configuration (4S), giving a total pack voltage of approximately 14.8V. Always verify that your cells' charge cutoff voltage (typically 4.2V per cell) matches the board's specifications before use.
Q: Can this board handle both charging and discharging?
A: Yes. This BMS module supports both charging and discharging protection at up to 8A continuous current. It automatically cuts off the circuit if an overcurrent or short-circuit condition is detected during either charge or discharge cycles.
Q: What does the wide operating temperature range mean for my project?
A: Rated from -40°C to +85°C, this protection board can function reliably in extreme cold or hot environments, making it suitable for outdoor power systems, automotive applications, and industrial DIY projects where temperatures may fluctuate significantly.