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Build a 3-cell lithium-ion battery pack with the HX-3S-01 battery protection board. Designed for 3S Li-ion battery configurations, this compact module provides protection against overcharging, over-discharging, overcurrent and short circuits.
The board is listed for use with three series-connected 18650 lithium-ion cells and compatible lithium-polymer battery packs. Its specified full-charge voltage is 12.6V.
This module is suitable for electronics projects requiring a 3S lithium-ion battery protection circuit. Review the current specifications and wiring requirements before connecting your battery pack.
3S battery configuration: For three lithium-ion cells connected in series.
Battery protection: Overcharge, over-discharge, overcurrent and short-circuit protection.
Model: HX-3S-01.
Working current: Listed maximum working current of 5–8A.
Transient current: Listed as 9–10A.
Full-charge voltage: 12.6V.
Compact PCB: Listed dimensions of 50 × 16 × 1mm.
Low quiescent current: Less than 6µA according to published specifications.
| Parameter | Specification |
|---|---|
| Model | HX-3S-01 |
| Battery configuration | 3S |
| Battery chemistry | Li-ion |
| Compatible cell type | 18650 Li-ion; lithium-polymer is also listed |
| Nominal voltage for 3.7V Li-ion cells | 11.1V |
| Full-charge voltage | 12.6V |
| Maximum working current | 5–8A |
| Transient current | 9–10A |
| Overcharge detection range | 4.25–4.35V ±0.05V per cell |
| Over-discharge detection range | 2.3–3.0V ±0.05V per cell |
| Quiescent current | <6µA |
| Internal resistance | <60mΩ |
| Dimensions | 50 × 16 × 1mm |
| Operating temperature | -40°C to +50°C |
| Storage temperature | -40°C to +80°C |
| Short-circuit protection | Listed; recovery delay |
Current rating clarification: The published specifications distinguish working current (5–8A) from transient current (9–10A). Do not treat 10A as a confirmed continuous operating rating.
3S 18650 lithium-ion battery packs
DIY battery-powered electronics
Solar street-light battery packs
Monitoring and backup power projects
Application suitability depends on the battery pack, load current, wiring, thermal conditions and correct installation.
Use with a compatible 3S lithium-ion battery pack.
The listed full-charge voltage is 12.6V.
The product sources do not confirm compatibility with LiFePO4 batteries. Do not list LiFePO4 compatibility.
Do not use this board for applications requiring a confirmed continuous 10A output.
Verify the board version and terminal markings before wiring.
Confirm that all three cell groups are suitable for a 3S lithium-ion pack.
Check individual cell-group voltages before connecting the board.
Follow the board's actual B-, B1, B2 and B+ connection markings.
Avoid reverse polarity and accidental short circuits.
Connect the battery and load according to the wiring diagram supplied with the exact board.
Use a compatible 3S lithium-ion charger.
Stop using the pack if the cells or wiring become unusually hot.
Add these internal links within the product description when the corresponding products are available in your store:
Compatibility note: These links are related products only. Exact cell compatibility and pack capacity depend on the cells and pack design; they are not guaranteed by the BMS listing.
1 × HX-3S-01 3S lithium-ion battery protection board