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I have used ifixit battery replacement before with great results. My SE disassembly went well. Upon installing the new battery I noticed a very small wire that may have come loose when the ribbon battery cable and adhesive strips were being taken out. Its to the left of the battery along side battery ribbon cable. I’m concerned it might be a speaker wire or? Can you give an idea what is and if its a speaker wire? It is very small and look like it needs to be connected.

It is the antenna cable I think you are talking about. It plugs in here.