1S BMS Protection Board 3.2V 3.7V Li-ion LiPo 5A–25A PCM
1S BMS Protection Board 3.2V 3.7V Li-ion LiPo 5A–25A PCM
1S BMS Battery Protection Board — 3.2V / 3.7V Li-ion & LiPo, 5A to 25A
Keep your single-cell lithium battery pack running safely and efficiently with this versatile 1S Battery Management System (BMS) Protection Board. Compatible with 3.2V LiFePO4 and 3.7V Li-ion / LiPo cells, this compact PCM board actively guards against overcharge, over-discharge, overcurrent, and short-circuit events — making it an ideal solution for solar street lamps, DIY battery packs, e-bikes, power tools, and more.
Key Features
- Wide Current Range: Available in 5A, 10A, 15A, 20A, and 25A continuous discharge ratings to suit your specific application.
- Dual Cell Chemistry Support: Works with 3.2V LiFePO4 (LFP) and 3.7V Li-ion / LiPo single-cell configurations.
- Overcharge Protection: Cuts off charging at 3.6–3.75V (LFP) or 4.25V (Li-ion) with a detection delay of just 0.5–1 second.
- Over-Discharge Protection: Disconnects load at 2.0–2.3V (LFP) or 2.7V (Li-ion) to preserve long-term cell health.
- Overcurrent & Short-Circuit Protection: Rapid 12–40ms overcurrent detection and 250–300ms short-circuit detection keep both battery and load safe.
- Automatic Recovery: Overcurrent and short-circuit protection resets automatically or upon charger/load reconnection — no manual reset required.
- Ultra-Low Quiescent Current: ≤30µA in operating mode and ≤20µA in sleep mode for minimal idle drain.
- Low On-Resistance: ≤50mΩ (standard) / ≤20mΩ (high-current variants) for efficient power delivery.
- Durable Construction: Plastic + metal build measuring 110 × 40.5 mm for easy integration into battery enclosures.
Technical Specifications
| Supported Cell Types | Li-ion, LiPo (3.7V) / LiFePO4 (3.2V) |
| Continuous Discharge Current | 5A / 10A / 15A / 20A / 25A |
| Transient Discharge Current | 8–30A / 10–50A |
| Charging Voltage | 3.6–3.75±0.05V / 4.25±0.025V |
| Overcharge Detection Voltage | 3.6–3.75±0.05V / 4.25±0.025V |
| Over-Discharge Detection Voltage | 2.0–2.3±0.05V / 2.7±0.05V |
| Short-Circuit Detection Delay | 300ms / 250ms |
| Main Circuit Resistance | ≤50mΩ / ≤20mΩ |
| Operating Current | ≤30µA |
| Sleep Mode Current | ≤20µA |
| Board Size | 110 × 40.5 mm |
| Material | Plastic + Metal |
| Package Contents | 1× BMS Protection Board |
Wiring Guide
- B+ — Connect to the positive terminal of the battery cell
- B− — Connect to the negative terminal of the battery cell
- P+ — Output / Input positive terminal (charger & load)
- P− — Output / Input negative terminal (charger & load)
Made in Mainland China.
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Learn more: EPA guidance on lithium-ion battery handling
Frequently Asked Questions
Q: What battery chemistries is this 1S BMS protection board compatible with?
A: This BMS board supports both 3.7V Li-ion / LiPo single cells and 3.2V LiFePO4 (LFP) single cells. The overcharge, over-discharge, and charging voltage thresholds differ between the two chemistries, so be sure to select the correct current rating and voltage configuration for your specific battery type.
Q: How does the overcurrent and short-circuit protection recover?
A: The board features automatic recovery for both overcurrent and short-circuit events. Protection will reset either automatically after a fault clears, or by reconnecting the charger or disconnecting the load — no manual button or reset procedure is needed.
Q: Which current rating should I choose for my application?
A: Choose a continuous discharge current rating that meets or slightly exceeds your load's maximum draw. For example, a 10A motor load would be best paired with the 15A or 20A board to allow headroom for transient current spikes. Always check your application's peak current requirement before selecting a rating.
Q: Can this BMS board be used for solar street lamp applications?
A: Yes. This board is well-suited for solar street lamp charge and discharge management. It handles both the charging input from a solar controller and the discharge output to the LED load, while protecting the lithium cell from overcharge during daytime charging and over-discharge during nighttime operation.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.