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1S 3.7V 3A Li-ion BMS Protection Board — 18650 Overcharge/Overdischarge/Short Circuit (5-Pack)
1S 3.7V 3A Li-ion BMS Protection Board 18650 Overcharge/Overdischarge/Short Circuit (5-Pack)
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1S 3.7V 3A Li-ion BMS Protection Board — 18650 Overcharge / Overdischarge / Short Circuit (5-Pack)
This 1S (single-cell) lithium-ion BMS protection board provides complete protection for a single 3.7V Li-ion or LiPo cell (18650, 21700, or flat LiPo pouch). With 3A continuous discharge current, overcharge protection (4.25–4.35V cutoff), overdischarge protection (2.5–3.0V cutoff), and short-circuit protection, it is the essential safety component for any DIY single-cell battery pack. The compact PCB integrates the DW01A protection IC and dual FS8205A MOSFETs.
Key Specifications
| Parameter | Value |
|---|---|
| Cell Configuration | 1S (single cell) |
| Nominal Cell Voltage | 3.7V |
| Full Charge Voltage | 4.2V |
| Continuous Discharge Current | 3A |
| Overcharge Protection | 4.25–4.35V (cutoff) |
| Overdischarge Protection | 2.5–3.0V (cutoff) |
| Short Circuit Protection | Yes (instantaneous cutoff) |
| Protection IC | DW01A + FS8205A dual MOSFET |
| Operating Temperature | -40°C to +85°C |
| Quantity | 5 pieces |
1S BMS Current Rating Comparison
| Rating | Best For | Example Load |
|---|---|---|
| 1A BMS | Low-power IoT, sensors | ESP8266, Arduino Pro Mini |
| 3A BMS (this listing) | Medium-power devices | ESP32 + peripherals, small motors |
| 5A BMS | High-power devices | Raspberry Pi, power tools |
| 10A+ BMS | High-current applications | E-bike motor, power bank |
Why Choose This 1S BMS?
- Complete protection suite — overcharge, overdischarge, overcurrent, and short circuit in one compact PCB
- DW01A + FS8205A — industry-standard protection IC combination, widely documented
- 3A continuous — supports ESP32 WiFi peaks, small DC motors, and LED arrays
- -40°C to +85°C — wide temperature range for outdoor and industrial battery applications
- 5-pack value — sufficient for multiple battery pack builds and replacements
Compatible With / Common Use Cases
- 18650 DIY battery pack: Single 18650 cell + BMS for protected battery pack (replaces pre-protected 18650)
- LiPo battery protection: Add protection to raw (unprotected) LiPo pouch cells for Arduino/ESP32 projects
- Power bank core: 18650 + BMS + TP4056 charger + MT3608 boost for DIY USB power bank
- RC model battery: Single-cell LiPo protection for small RC aircraft and ground vehicles
- Wearable electronics: Compact LiPo protection for wearable sensor nodes and fitness devices
Frequently Asked Questions
Q: What is the difference between B+ / B− and P+ / P− pads on this BMS?
A: B+/B− connect directly to the battery cell terminals. P+/P− (or OUT+/OUT−) are the protected output terminals for the load. Always connect the load to P+/P− to benefit from overdischarge and short-circuit protection. Connecting the load directly to B+/B− bypasses the protection circuit.
Q: Can I charge and discharge simultaneously through this BMS?
A: Most 1S BMS boards with DW01A use a single-port design (same P+/P− for charge and discharge). Simultaneous charge and discharge is possible but the charger and load share the same port. For dedicated separate charge/discharge ports, use a dual-port BMS design. Check the specific board’s schematic for port configuration.
Q: Why does my BMS cut off at 3A even though the load draws less?
A: The 3A rating is the continuous discharge limit. If the load has high inrush current (motor startup, capacitor charging), the instantaneous current may exceed 3A and trigger the overcurrent protection. The BMS will reset automatically after the overcurrent condition clears. For loads with high inrush, use a 5A or 10A BMS instead.
Package Contents
- 5× 1S 3.7V 3A Li-ion BMS Protection Board (DW01A + FS8205A)
- ★Product Description
- ★About us
- ★Custom cable
1S 3.7V 3A Li-ion BMS Protection Board — 18650 Overcharge / Overdischarge / Short Circuit (5-Pack)
This 1S (single-cell) lithium-ion BMS protection board provides complete protection for a single 3.7V Li-ion or LiPo cell (18650, 21700, or flat LiPo pouch). With 3A continuous discharge current, overcharge protection (4.25–4.35V cutoff), overdischarge protection (2.5–3.0V cutoff), and short-circuit protection, it is the essential safety component for any DIY single-cell battery pack. The compact PCB integrates the DW01A protection IC and dual FS8205A MOSFETs.
Key Specifications
| Parameter | Value |
|---|---|
| Cell Configuration | 1S (single cell) |
| Nominal Cell Voltage | 3.7V |
| Full Charge Voltage | 4.2V |
| Continuous Discharge Current | 3A |
| Overcharge Protection | 4.25–4.35V (cutoff) |
| Overdischarge Protection | 2.5–3.0V (cutoff) |
| Short Circuit Protection | Yes (instantaneous cutoff) |
| Protection IC | DW01A + FS8205A dual MOSFET |
| Operating Temperature | -40°C to +85°C |
| Quantity | 5 pieces |
1S BMS Current Rating Comparison
| Rating | Best For | Example Load |
|---|---|---|
| 1A BMS | Low-power IoT, sensors | ESP8266, Arduino Pro Mini |
| 3A BMS (this listing) | Medium-power devices | ESP32 + peripherals, small motors |
| 5A BMS | High-power devices | Raspberry Pi, power tools |
| 10A+ BMS | High-current applications | E-bike motor, power bank |
Why Choose This 1S BMS?
- Complete protection suite — overcharge, overdischarge, overcurrent, and short circuit in one compact PCB
- DW01A + FS8205A — industry-standard protection IC combination, widely documented
- 3A continuous — supports ESP32 WiFi peaks, small DC motors, and LED arrays
- -40°C to +85°C — wide temperature range for outdoor and industrial battery applications
- 5-pack value — sufficient for multiple battery pack builds and replacements
Compatible With / Common Use Cases
- 18650 DIY battery pack: Single 18650 cell + BMS for protected battery pack (replaces pre-protected 18650)
- LiPo battery protection: Add protection to raw (unprotected) LiPo pouch cells for Arduino/ESP32 projects
- Power bank core: 18650 + BMS + TP4056 charger + MT3608 boost for DIY USB power bank
- RC model battery: Single-cell LiPo protection for small RC aircraft and ground vehicles
- Wearable electronics: Compact LiPo protection for wearable sensor nodes and fitness devices
Frequently Asked Questions
Q: What is the difference between B+ / B− and P+ / P− pads on this BMS?
A: B+/B− connect directly to the battery cell terminals. P+/P− (or OUT+/OUT−) are the protected output terminals for the load. Always connect the load to P+/P− to benefit from overdischarge and short-circuit protection. Connecting the load directly to B+/B− bypasses the protection circuit.
Q: Can I charge and discharge simultaneously through this BMS?
A: Most 1S BMS boards with DW01A use a single-port design (same P+/P− for charge and discharge). Simultaneous charge and discharge is possible but the charger and load share the same port. For dedicated separate charge/discharge ports, use a dual-port BMS design. Check the specific board’s schematic for port configuration.
Q: Why does my BMS cut off at 3A even though the load draws less?
A: The 3A rating is the continuous discharge limit. If the load has high inrush current (motor startup, capacitor charging), the instantaneous current may exceed 3A and trigger the overcurrent protection. The BMS will reset automatically after the overcurrent condition clears. For loads with high inrush, use a 5A or 10A BMS instead.
Package Contents
- 5× 1S 3.7V 3A Li-ion BMS Protection Board (DW01A + FS8205A)
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