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2S 7.4V 18650 BMS Protection Board — 8A Continuous / 16A Peak
2S 7.4V 18650 BMS Protection Board 8A Continuous / 16A Peak
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2S 7.4V 18650 Lithium Battery BMS Protection Board — 8A / 16A
This compact 2S BMS (Battery Management System) protection board is designed for 2-cell series 18650 lithium-ion battery packs operating at 7.4V nominal. It provides essential protection against overcharge, overdischarge, overcurrent, and short circuits, making it a critical safety component for DIY power banks, RC vehicles, portable tools, and embedded battery systems.
Key Specifications
| Parameter | Value |
|---|---|
| Configuration | 2S (2 cells in series) |
| Nominal Voltage | 7.4V |
| Compatible Cell | 18650 Li-ion (3.7V per cell) |
| Working Current | 8A continuous |
| Current Limiting (Peak) | 16A |
| Overcharge Protection | 4.25V ± 0.05V per cell |
| Overdischarge Protection | 2.5V ± 0.1V per cell |
| Short Circuit Protection | Yes (auto-recovery) |
| Origin | CN |
Why Choose This BMS Board?
- Full protection suite — Overcharge, overdischarge, overcurrent (8A continuous / 16A peak), and short-circuit protection in a single compact module
- Auto-recovery — Short-circuit protection resets automatically once the fault condition is removed; no manual reset required
- Compact form factor — Designed to fit standard 18650 2S battery pack enclosures and DIY builds
- Cell balancing — Passive balancing during charging ensures both cells reach equal voltage, extending pack lifespan
- Wide application compatibility — Suitable for RC vehicles, power banks, portable lighting, e-bikes, and embedded systems
Typical Applications
- DIY 2S 18650 lithium battery packs for RC cars, drones, and robots
- Portable power banks and USB battery stations
- Cordless power tools and handheld devices
- LED lighting systems with rechargeable 7.4V packs
- Arduino and Raspberry Pi mobile power supply projects
- E-bike and electric scooter auxiliary battery protection
Compatible With
- Samsung INR18650-25R, LG HG2, Panasonic NCR18650B, Sony VTC5A (and equivalent 18650 cells)
- Standard 2S 18650 battery holders and spot-welded nickel strip packs
- TP4056-based charger modules (via B+ / B- pads)
- DC-DC boost converters for 5V/12V output from 7.4V pack
Frequently Asked Questions
Q: What is the difference between 8A working current and 16A current limiting?
The 8A working current is the maximum sustained discharge current the board can handle continuously without thermal issues. The 16A current limiting is the peak threshold at which the board triggers overcurrent protection and cuts off output. Loads drawing more than 16A instantaneously will trigger the protection circuit.
Q: Can this board be used for charging and discharging simultaneously?
This board is a protection-only BMS, not a combined charge/discharge management board. It protects the cells during both charge and discharge cycles but does not regulate charging current. Use a dedicated charger (e.g., TP4056 or CC/CV charger set to 8.4V for 2S) in conjunction with this board.
Q: How do I wire this board to my 18650 cells?
Connect B+ to the positive terminal of cell 1, BM (balance tap) to the junction between cell 1 and cell 2, and B- to the negative terminal of cell 2. The P+ and P- pads connect to your load and charger. Ensure correct polarity before connecting cells.
Package Contents
- 1× 2S 7.4V 18650 BMS Protection Board (8A / 16A)
18650 cells, charger, and wiring not included.
