2S 5A BMS Protection Board for 7.4V 8.4V 18650 Li-ion Battery
2S 5A BMS Protection Board for 7.4V 8.4V 18650 Li-ion Battery
2S 5A BMS PCM Protection Board for 7.4V–8.4V 18650 Lithium Battery Packs
Keep your 2-cell lithium battery packs safe and performing at their best with this compact 2S 5A Battery Management System (BMS) Protection Board. Designed for 7.4V nominal / 8.4V fully-charged 18650 Li-ion cell configurations, this PCM (Protection Circuit Module) guards against overcharge, over-discharge, and overcurrent — extending the life of your battery packs and the devices they power.
Made in Mainland China.
Key Features
- 2S Configuration: Optimized for two-cell series 18650 Li-ion battery packs (7.4V nominal, 8.4V max)
- 5A Continuous Current: Handles up to 5A charge/discharge current for reliable performance
- Overcharge Protection: Cuts off charging when cell voltage reaches the upper threshold, preventing damage
- Over-Discharge Protection: Disconnects load before cells drop to unsafe voltage levels
- Overcurrent & Short-Circuit Protection: Instantly responds to current spikes to protect both the board and connected cells
- Wide Operating Temperature: Functions reliably from -40°C to +85°C
- SMD Construction: Compact surface-mount design for easy integration into custom battery cell packs
- Charging Voltage: 8.4V–9V input charging voltage range
- No High-Concern Chemicals: Safe for everyday electronics assembly
Specifications
| Configuration | 2S (2 cells in series) |
| Continuous Current | 5A |
| Nominal Voltage | 7.4V |
| Max Charge Voltage | 8.4V |
| Charging Input Voltage | 8.4V – 9V |
| Compatible Cells | 18650 Li-ion / Lithium |
| Package Type | SMD |
| Operating Temperature | -40°C to +85°C |
| Condition | New |
| Quantity | 1 piece |
| Country of Origin | Mainland China |
Who Is This For?
This BMS protection board is ideal for electronics hobbyists, DIY battery pack builders, RC enthusiasts, and engineers who need a reliable, low-cost protection solution for dual-cell 18650 lithium battery assemblies used in laptops, power tools, robotics, and custom electronic projects.
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Frequently Asked Questions
Q: What does a 2S 5A BMS protection board do for my 18650 lithium battery pack?
A: A BMS (Battery Management System) protection board monitors and controls the charging and discharging of your Li-ion cells. This 2S 5A board protects your two-cell 18650 pack from overcharge (above 8.4V per cell threshold), over-discharge, overcurrent, and short-circuit conditions — all of which can permanently damage unprotected lithium cells.
Q: Is this board compatible with all 18650 Li-ion cells?
A: Yes, this BMS PCM protection board is designed for standard 7.4V (2S) 18650 Li-ion lithium battery configurations. It supports a charging input voltage of 8.4V–9V and handles up to 5A of continuous current, making it compatible with most 18650 cell packs used in DIY electronics projects.
Q: What is the difference between BMS and PCM?
A: BMS (Battery Management System) and PCM (Protection Circuit Module) are closely related terms. A PCM typically refers to the basic protection circuitry (overcharge, over-discharge, overcurrent), while a BMS may also include cell balancing. This board provides core PCM protection functions and is commonly referred to as both a BMS and PCM board in the DIY electronics community.