Description
The HX-2S-JH10 2S 8A Li-ion BMS Protection Board is a compact battery management and protection module designed for 2S lithium-ion battery packs made from two Li-ion cells or cell groups connected in series.
A 2S Li-ion pack has a nominal voltage of approximately 7.4V and reaches approximately 8.4V when fully charged. This BMS helps protect the battery pack during charging and discharging by monitoring battery voltage and providing protection against conditions such as overcharge, over-discharge, overcurrent, and short circuit.
With its compact 40 × 17 × 3.5mm PCB size, the HX-2S-JH10 can be integrated into a variety of DIY battery packs and portable electronics projects.
Key Features
- 2S Li-ion BMS protection board
- Designed for 7.4V nominal Li-ion battery packs
- Suitable for 18650 Li-ion cells
- Maximum listed working current: 8A
- Maximum instantaneous current: 10A
- Overcharge protection
- Over-discharge protection
- Overcurrent protection
- Short-circuit protection
- Automatic recovery after short-circuit protection
- Low quiescent current
- Compact PCB design
- Suitable for DIY battery pack applications
Battery Configuration
This board is designed for a 2S Li-ion battery configuration, meaning two compatible Li-ion cells or cell groups are connected in series.
Typical configuration:
Cell 1 + Cell 2 → 2S Li-ion pack
- Nominal voltage: approximately 7.4V
- Full-charge voltage: approximately 8.4V
- Battery chemistry: Li-ion
- Suitable cell type: compatible 18650 Li-ion cells
Do not use this BMS for LiFePO4 cells, as the charging and protection voltage levels are different.
Protection Functions
The HX-2S-JH10 provides several protection functions for a compatible 2S Li-ion battery pack.
Overcharge Protection
The board monitors individual cell voltage and disconnects the battery when the specified overcharge condition is detected.
Listed overcharge detection range:
4.25–4.35V ±0.05V
Over-Discharge Protection
The BMS helps prevent excessive discharge of the connected Li-ion cells.
Listed over-discharge detection range:
2.5–3.0V ±0.05V
Overcurrent Protection
The board provides protection against excessive current draw.
- Upper working current: 8A
- Upper instantaneous current: 10A
The actual suitable continuous current depends on the battery cells, wiring, PCB installation, cooling, and application.
Short-Circuit Protection
The board provides short-circuit protection and disconnects the load when a short circuit is detected. The listing specifies delayed self-recovery after the protection condition is removed.
Pin / Terminal Connections
| Terminal | Function |
|---|---|
| B+ | Positive connection of the battery pack |
| B- | Negative connection of the battery pack |
| BM | Connection point between the two series-connected cells |
| P+ | Positive output / charging connection |
| P- | Negative output / charging connection |
For a 2S pack, BM must be connected to the junction between the two series cells. Incorrect wiring can damage the BMS or battery cells.
Specifications
| Specification | Details |
|---|---|
| Model | HX-2S-JH10 |
| BMS Configuration | 2S |
| Battery Chemistry | Li-ion |
| Nominal Pack Voltage | 7.4V |
| Full-Charge Voltage | Approx. 8.4V |
| Maximum Working Current | 8A |
| Maximum Instantaneous Current | 10A |
| Over-Discharge Detection | 2.5–3.0V ±0.05V |
| Overcharge Detection | 4.25–4.35V ±0.05V |
| Quiescent Current | <10µA |
| Internal Resistance | <300mΩ |
| Working Temperature | -40°C to 50°C |
| Storage Temperature | -40°C to 80°C |
| Board Size | Approx. 40 × 17 × 3.5mm |
| Short-Circuit Protection | Yes |
| Application | 2S Li-ion Battery Pack |
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