Description
This 2S (2-series) 7.4V / 8.4V 3A Lithium-ion battery protection board (BMS) is designed to protect dual 18650 battery packs against overcharging, over-discharging, overcurrent, and short circuits. Featuring pre-welded nickel strips, it allows for easy spot welding or soldering directly onto 2-cell lithium battery packs, ensuring reliable circuit safety for small portable electronics.
Specification
Product Model: 2S 3A 18650 Protection Board
Compatible Battery Type: 3.7V / 4.2V 18650 Li-ion & Li-Po cells
Battery Series Configuration: 2S (2 cells in series)
Nominal Pack Voltage: 7.4V
Full Charge Output Voltage: 8.4V (4.2V per cell)
Maximum Continuous Discharge Current: 3A
Instantaneous / Peak Current Limit: 5A
Overcharge Detection Voltage: 4.25V ± 0.025V (per cell)
Overcharge Release Voltage: 4.05V ± 0.05V (per cell)
Over-Discharge Detection Voltage: 2.50V ± 0.08V (per cell)
Over-Discharge Release Voltage: 3.00V ± 0.1V (per cell)
Protection Functions: Overcharge, Over-discharge, Overcurrent, Short Circuit
Internal Resistance: Less than 45 mΩ
Connecting Interface: Pre-welded nickel strip tabs
Terminal Pinout: B+ (Battery positive), B- (Battery negative), MB (Center cell junction), P+ (Charge/Discharge positive), P- (Charge/Discharge negative)
Operating Temperature: -40°C to +50°C
Dimensions: 36 mm × 6.5 mm × 2 mm (Ultra-slim profile)
Application
Portable handheld fans and rechargeable desk fans
High-intensity LED flashlights, headlamps, and searchlights
Custom 2S 7.4V 18650 battery pack builds
Portable Bluetooth speakers and audio amplifiers
RC toys, smart sensors, and DIY electronics power modules
