Question What do i need to know about laptop charger before buying a replacement, and what pin size I will need ?

[shivajikobardan]

My laptop is a Dell Inspiron 15 5567 with Service Tag 8BNWK22

My charger specifications are:
19.5V
3.34A
65W

It is positive polarity adapter.

Also, how do I know if it is small pin or large pin? (I am ordering online so need to know it) It seems like it is 4.5 mm.

 

[kerberos_20]

it is 4.5mm
https://www.dell.com/en-us/shop/dell-45mm-barrel-65w-power-adapter/apd/492-bbme