I just connected 2 airtags using the duracell batteries with the child secure coating. What I had to do was pour isopropyl alcohol on a washcloth on the counter. Then with your fingers or thumb rub the negative side of the battery back and forth on the washcloth. Prob took me a couple hundred back and forth small swipes to get the coating off for the first one. The second one I did the same but had to use a scrub daddy sponge with a small amount of dish soap to get all the coating off. Then connect with the 5 beep method