2S 7.4V / 8.4V 3A 18650 Li-ion Battery Protection Board (With Pre-Welded Nickel Strips)

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