i was being kind of careless and accidentally put the battery in backwards and there was a tiny spark and there is a very small black mark on the negative of the battery that was upside down i put them in a regulated mod and they still work but is there danger in using it in my regulated mod?
Visual damage might be minor but it is what you can't see that could be a concern. As @sonicbomb stated batteries are cheap enough to replace to protect against the unknown.
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