I don't Feel there is any ay the battery one could damage coins (completed one after the other), but probably wouldn't do any very good possibly. I have been careful with one other just one. I was generally thinking of making use of them for closely encrusted ancients. Feb. 2017, https://gold-ira96161.webbuzzfeed.com/36698343/considerations-to-know-about-self-directed-ira