DIY 12V power bank! Short circuit protection

Schematic & PCB:
https://drive.google.com/drive/folder...

How To Make PCB At Home (Homemade PCB):
   • How To Make PCB  At Home (Homemade PCB)  

Components and supplies:
1M ohm Resistor X2
1N4007 Diode X2
2N3904 Transistor X2
Push Button 4-Pin
2-Pin Screw Terminal Block Connector
3S BMS BLUE 3S 12V 10A (18650 Lithium Battery Charger)
Mini Rocker Switch (2-Pin ON/Off SPST)
DC Power Jack (DC-005)
3S 18650 Battery Holder Case with Pin
DC Mini Digital Voltmeter (0.28inch, 3-Wire, 0-36V/DC)
18650 Rechargeable Battery X3 (3.7v Li-ion Batteries)
DC 12v 2A Power Supply Charger Adapter

Video parts list:
00:00 Schematic and PCB
00:29 Assembling the power bank circuit
04:11 Battery connection to power bank kit
04:47 Testing the power bank circuit
05:38 How to charge the power bank kit