m.2 ssd install question

[packersfan036]

should I unhook the battery first before installing a m.2 pci-e ssd drive into my Lenovo gaming laptop? or just install it?

 

[InfoSponge16]

It is always a good idea to remove power from the machine before removing or installing components.

 

[packersfan036]

It is always a good idea to remove power from the machine before removing or installing components.

why?