Description
The 3S 10A 12.6V Li-Ion BMS Board is a compact battery protection and balanced charging module designed for 3-cell series lithium-ion battery packs. It is suitable for battery packs made using 18650, 26650, and compatible lithium-polymer cells with a nominal cell voltage of 3.6V or 3.7V.
This BMS board helps protect the battery pack during charging and discharging by monitoring cell voltage and providing protection against overvoltage, over-discharge, overcurrent, and short-circuit conditions. Its compact PCB design makes it suitable for DIY battery packs and a variety of portable electronics projects.
Key Features
- Designed for 3S Li-ion battery packs
- Suitable for 18650, 26650 and compatible lithium batteries
- 12.6V charging voltage for a 3S Li-ion pack
- Supports balanced charging between the three series-connected cells
- Overvoltage protection
- Over-discharge protection
- Overcurrent protection
- Short-circuit protection
- Automatic/self-recovery after protection conditions
- Compact PCB design
- Model: HX-3S-01
- Suitable for DIY battery pack and electronics projects
3S Li-Ion Battery Configuration
This board is designed for three lithium-ion cells connected in series:
| Battery Configuration | Voltage |
|---|---|
| 1 × Li-ion cell | 3.6V–3.7V nominal |
| 2 × cells in series | 7.2V–7.4V nominal |
| 3 × cells in series | 10.8V–11.1V nominal |
| Fully charged 3S pack | 12.6V |
A suitable 12.6V Li-ion charger should be used to charge the completed 3S battery pack.
Protection Functions
The BMS monitors the connected battery cells and helps protect the pack from abnormal operating conditions.
Overvoltage Protection
The supplied specification lists an overvoltage detection range of approximately 4.25–4.35V ±0.05V per cell.
Over-Discharge Protection
The supplied specification lists an over-discharge detection range of approximately 2.3–3.0V ±0.05V per cell.
Overcurrent Protection
The specification lists a maximum operating current of 5A–6A and an upper instantaneous current limit of 8A. Actual current capability also depends on the battery cells, wiring, connections, cooling, and load.
Short-Circuit Protection
The board includes short-circuit protection with a self-recovery/protection delay function.
Important Wiring Information
Correct wiring is essential when installing this 3S BMS. Connect the three series cell groups according to the board’s wiring diagram and terminal markings:
0V → 4.2V → 8.4V → 12.6V
Incorrect wiring can damage the BMS IC and may create a safety hazard. Always verify the cell voltages and wiring before connecting the battery pack.
After initial connection, the battery pack may require charging activation before the output becomes available.
Use Matched Battery Cells
For reliable operation, use three cells or three parallel cell groups with closely matched:
- Voltage
- Capacity
- Internal resistance
- General condition
Do not combine old, damaged, or significantly different cells with good/new cells. Properly matched cells help the BMS perform more effectively and improve battery-pack reliability.
Specifications
| Specification | Details |
|---|---|
| Model | HX-3S-01 |
| BMS Type | 3S Li-ion Battery Protection Board |
| Battery Type | Li-ion / Lithium |
| Compatible Cells | 18650, 26650, compatible Li-ion/Li-polymer |
| Cell Configuration | 3S |
| Nominal Cell Voltage | 3.6V / 3.7V |
| Charging Voltage | 12.6V–13V |
| Product Rating | 10A |
| Maximum Operating Current | 5A–6A |
| Upper Instantaneous Current Limit | 8A |
| Overvoltage Detection | 4.25–4.35V ±0.05V |
| Over-Discharge Detection | 2.3–3.0V ±0.05V |
| Working Current | <30µA |
| Short-Circuit Protection | Yes |
| Protection Recovery | Self-recovery |
| Service Life | >50,000 hours |
| Operating Temperature | -40°C to +50°C |
| Storage Temperature | -40°C to +80°C |
| PCB Size | 50 × 16 × 1 mm |
| Model Number | HX-3S-01 |
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