5V Step-Up Power Bank Module Lithium Battery Charging Protection Board USB Type-B 134N3P

The 5V Step-Up Power Bank Module (Lithium Battery Charging  Protection Board with USB Type-B) is an electronic circuit board used to convert a single lithium battery (3.7V) into a stable 5V output, like a mobile power bank.

It also includes battery charging and protection features, making it useful for DIY power bank projects and portable electronics.

• Input Voltage: 3.7V (Lithium-ion / Li-Po battery)
• Output Voltage: 5V DC (USB output)
• Output Current: Up to 1A (varies by module quality)
• Charging Voltage: 5V via USB Type-B input
• Protection Features:
  • Overcharge protection
  • Over-discharge protection
  • Short-circuit protection
• Boost Converter IC: 134N3P (or similar variant)
• Efficiency: ~85% (typical)
• Ports: USB output + USB Type-B input