This 1S 3A BMS Protection Board is designed for single-cell 3.7V lithium batteries such as 18650 or polymer Li-ion cells. It features 2 MOSFETs for precise control of charging and discharging, offering robust protection against overcharge, over-discharge, overcurrent, and short circuits.
This version comes pre-soldered with a nickel strip, making it ideal for spot-welding directly onto 18650 cells. It is suitable for compact battery pack assemblies where space and safety are a priority.
Key Features
Pre-Soldered Nickel Strip – Easy integration with 18650 cells via spot welding.
Complete Battery Protection – Overcharge, over-discharge, overcurrent, and short-circuit protection.
Ultra-Low Self-Consumption – Preserves battery life with ≤3µA idle current.
Auto-Recovery Design – Recovers automatically from fault conditions.
Specifications
Battery Type: 1S 3.7V Li-ion / Li-Polymer
Max Charging Current: 2A
Max Discharging Current: 3A (continuous)
Overcharge Voltage: 4.25V ± 0.05V
Overcharge Release Voltage: 4.23V ± 0.05V
Over-discharge Voltage: 2.0–2.1V
Over-discharge Release Voltage: 2.3V ± 0.1V
Overcurrent Detection Voltage: 200mV ± 25mV
Overcurrent Detection Current: 3A
Short Circuit Protection: Yes (250µs detection delay)
Working Current: ≤20µA
Sleep Current (Over-discharge): ≤20µA
Self-Consumption: ≤3µA
Internal Resistance: ≤20mΩ
Operating Temperature: -20°C to +40°C
Installation & Precautions
Match battery cells before installation (≤0.05V voltage difference).
For used batteries, ensure cells are healthy (check with multimeter).
Do not screw terminal joints—use spot welding for 18650 cells.
Always check voltage across cells before connecting to avoid damage to the protection IC.
Applications
