The acetone bottle shown runs the risk of dispensing a lot of solvent - which may well damage the speaker plastic. I used a 5 ml plastic pipette to deliver small controlled amounts and had no problems removing the battery without having to take everything else out :-) I also used propanol (isopropyl alcohol) on some kitchen towel to remove the adhesive residue from the case - slightly less effective than acetone, but doesn't dissolve the plastic :-)

This isn’t the WiFi antenna - I suspect its for GPS reception. Removing this antenna makes no difference to wiFi or Blue tooth signal strength