Description
The 2S 3A 7.4V 8.4V 18650 Li-ion Lithium Battery BMS Protection Board is designed for DIY battery packs made using two Li-ion cells connected in series. It is a compact PCB module that helps protect a 2S lithium-ion battery pack during charging and discharging.
With a 3A maximum working current and 5A instantaneous peak current, this protection board is suitable for low-current portable electronics and DIY battery projects where the electrical requirements match the board specifications.
The module includes several important battery protection functions, including overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection. It also provides dedicated connection points for the battery cells, midpoint connection, and load/charger output.
Key Features
- Designed for 2S Li-ion battery packs
- Suitable for 18650 Li-ion battery cells
- 7.4V nominal battery pack configuration
- 8.4V full-charge voltage
- Maximum working current: 3A
- Instantaneous peak current: 5A
- Upper instantaneous current limit: 8A
- Overcharge protection
- Over-discharge protection
- Overcurrent protection
- Short-circuit protection
- Compact PCB design
- Battery midpoint connection through BM/MB terminal
- Suitable for DIY portable battery projects
Specifications
| Specification | Details |
|---|---|
| Product Type | 2S Li-ion BMS / Protection Board |
| Battery Chemistry | Li-ion / Lithium-ion |
| Number of Cells | 2 cells |
| Battery Configuration | 2S |
| Nominal Pack Voltage | 7.4V |
| Full-Charge Voltage | 8.4V |
| Maximum Working Current | 3A |
| Instantaneous Peak Current | 5A |
| Upper Instantaneous Current Limit | 8A |
| Overcharge Voltage Range | 4.25–4.35V ± 0.05V |
| Over-Discharge Voltage Range | 2.5–3.0V ± 0.05V |
| Over-Discharge Detection Range | 2.3–3.0V ± 0.05V |
| Quiescent Current | Less than 30µA |
| Internal Resistance | Less than 45mΩ* |
| Operating Temperature | -40°C to +50°C |
| Storage Temperature | -40°C to +80°C |
| Protection | Overcharge, over-discharge, overcurrent, short circuit |
| Package Weight | Approx. 15g |
| Package Size | Approx. 5 × 3 × 2cm |
| SKU | 0731 |
*The supplied product data also lists internal resistance as “less than 45 MΩ” in one section; the feature specification states less than 45mΩ, which is the technically consistent value.
Pin Descriptions
| Pin | Function |
|---|---|
| B+ | Positive connection of battery pack |
| B- | Negative connection of battery pack |
| BM / MB | Connection point between the two battery cells |
| P+ | Positive output / charging connection |
| P- | Negative output / charging connection |
Protection Functions
Overcharge Protection:
Helps prevent the Li-ion cells from being charged beyond the specified protection threshold.
Over-Discharge Protection:
Disconnects the battery when the cell voltage drops below the specified protection range.
Overcurrent Protection:
Provides protection when the connected load draws excessive current beyond the board’s operating limits.
Short-Circuit Protection:
Helps protect the battery pack and connected circuit in the event of a short circuit.
Applications
This 2S 3A BMS board can be used in compatible low-current DIY battery applications, including:
- 2S 18650 Li-ion battery packs
- Portable electronics
- DIY rechargeable battery projects
- Small electronic devices
- Battery-powered modules
- Low-current LED projects
- DIY robotics and electronics
- Portable power projects
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