LG K92 5G battery question

[cyncat458]

I am replacing the "non-removable" battery in my LG K92 5G.
Question...
What is this black square attached to the old battery & what do I do with it?

 

[rvbfan]

Could be a heatsink. Rule of thumb is if you take it out, put it back.

 

[B. Diddy]

Welcome to Android Central! I'm guessing it's the NFC coil.

 

[mustang7757]

I remember that's how we got wireless charging back in the Samsung S4/S5 days with removable batteries

 

[mustang7757]

Like this

 

[cyncat458]

Pl
O:

I am replacing the "non-removable" battery in my LG K92 5G.
Question...
What is this black square attached to the old battery & what do I do with it?View attachment 353534

Thank you all. I get the black square off the old & onto the new battery. Phone is all put back together & works like a charm.