Agree with Tim on all he said.
Bushmaster (Roger) was kind enough to send them to me when I was one of the first here to buy the Panasonic IMR 18650 batteries and didn't realize they were flat tops. (They sell the same battery now with a button). When they came, I could use them fine, but I was having to push the button down further, just like explained above. Anyway, you are right- these little magnets are hard to find. I came up empty handed when I just did a search for them at the typical places that they would be. That said, if you already have flat top batteries and need magnets for them, I'm thinking that the door magnets that Rob sells on his site would work. PM or email him and check with him....while you're on his site, you might want to buy a spring or two- always good to have just in case of any mishaps!!