2S 7.4V 18650 Protection Module – Round Shape (HX-2S-A2)

• Round compact design (17.5mm diameter) optimized for cylindrical battery configurations

• Integrated protection against overcharge, over-discharge, overcurrent, and short circuit

• Long operational lifespan of over 50,000 hours

• Short circuit protection with automatic recovery after charging

• Ultra-low quiescent current consumption

• High reliability and performance in wide operating temperature conditions

Specifications

• Model: HX-2S-A2

• Battery Configuration: 2S (7.4V nominal)

• Charging Voltage: 8.4V–9V

• Overcharge Voltage Range: 4.25V–4.35V ± 0.05V

• Over-discharge Voltage Range: 2.5V–3.0V ± 0.05V

• Continuous Operating Current: 5A

• Peak Instantaneous Current: 7A

• Quiescent Current: <10µA

• Internal Resistance: <300mΩ

• Operating Temperature: -40°C to +50°C

• Storage Temperature: -40°C to +80°C

• Size: 17.5 × 17.5 × 3.2 mm

• Effective Life: >50,000 hours

Connector Description

• B+: Connect to battery positive terminal

• B−: Connect to battery negative terminal

• MB: Connect between the first and second battery (mid-point tap)

• P+: Positive terminal for both charging and discharging

• P−: Negative terminal for both charging and discharging

Important Notes

• This protection module is not suitable for use with:

  • Lithium iron phosphate (LiFePO4) batteries

  • High-drain applications like hernia lamps, hand drills, electric bicycles, fish machines

  • Motors drawing >4A (e.g., 775 motors), or high-power LEDs (e.g., 1W fish-eye LEDs)

• Batteries must be in good condition—excessive heat indicates the battery is incompatible or defective

• Do not continue use if the battery heats up during operation to avoid damage or failure

Applications

• 2-cell 18650 lithium-ion battery packs

• Portable low-power devices

• DIY electronics and robotics

• Low-power LED systems

• Battery-powered instruments and toys

• Wearable or compact embedded electronics