Anyone knows what this is?

[fennekfox21]

I opened my MacBook Pro 12,1 (early 2015) today because it gave me a pnn001 error and found this half connected inside and removed it because of that.
What is it?

I couldn't find anything anywhere

 

[dmccloud]

Possibly a blown capacitor based on the second picture - looks like it broke off the pad next to the battery cable. Also, are you sure the error code was "PNN001" and not "PPN001"? The latter indicates an issue with the power management system, and there are no codes listed with a PNN prefix.