How does a Dell laptop charger with a pin of the same wattage & specs which fits perfectly into an HP not work because it knows it is not an HP charger
![DELL Laptop Charger Big Pin 65 W Adapter, Output Voltage: 19.5 Volts, Input Voltage: 240V at Rs 600/piece in Kolkata DELL Laptop Charger Big Pin 65 W Adapter, Output Voltage: 19.5 Volts, Input Voltage: 240V at Rs 600/piece in Kolkata](http://5.imimg.com/data5/SELLER/Default/2022/6/UN/NQ/ES/4269059/dell-laptop-charger-big-pin-65-w-adapter.jpg)
DELL Laptop Charger Big Pin 65 W Adapter, Output Voltage: 19.5 Volts, Input Voltage: 240V at Rs 600/piece in Kolkata
![Ac Power Cord Charger Laptop Adapter Tip Connector Converter for HP Stream Spectre Pavilion Envy EliteBook Split Chromebook EliteBook Folio Female 7.4x5.0mm to 4.5x3.0mm : Amazon.co.uk: Computers & Accessories Ac Power Cord Charger Laptop Adapter Tip Connector Converter for HP Stream Spectre Pavilion Envy EliteBook Split Chromebook EliteBook Folio Female 7.4x5.0mm to 4.5x3.0mm : Amazon.co.uk: Computers & Accessories](https://m.media-amazon.com/images/I/514i+djRjSL.jpg)
Ac Power Cord Charger Laptop Adapter Tip Connector Converter for HP Stream Spectre Pavilion Envy EliteBook Split Chromebook EliteBook Folio Female 7.4x5.0mm to 4.5x3.0mm : Amazon.co.uk: Computers & Accessories
![Replacement AC Laptop Charger 20V, 7.5A, 150W with Blue Tip centre Pin 4.5mm x 3mm - DELTA75 Bluepin Replacement AC Laptop Charger 20V, 7.5A, 150W with Blue Tip centre Pin 4.5mm x 3mm - DELTA75 Bluepin](https://www.pless.co.uk/pub/media/catalog/product/cache/bd4337c53e72a5cf0bb603b254dcf63f/3/0/30533_1.jpg)