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For example, say someone gets the Unsung Hero badge for 10 or more zero score accepted answers, and 25% of total. Now, say someone goes and votes for some of their zero score accepted answers. Do they still have the badge? I'm not speaking specifically about this badge, but it's one easy example I thought of.

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Once you get a badge, it is yours forever. A more interesting (at least I think so) example of this is if you have an answer that gets 10 upvotes, and then later gets many downvotes. Then even though you shouldn't have a nice answer badge anymore, you still do. But in this case, you wouldn't be awarded the next nice answer badge.

More about this can be found here.

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  • $\begingroup$ I'm not sure that the link is up to date, and I am fairly certain that some changes to the badges system were introduced since then. Edit: According to this meta.SO thread, the information is up to date. I wonder how that works with respect to removed votes from account deletions. $\endgroup$ – Asaf Karagila Dec 15 '12 at 20:02
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    $\begingroup$ It does mention, however, that tag specialist badges may disappear (at least if I understand it correctly). $\endgroup$ – Asaf Karagila Dec 15 '12 at 20:09
  • $\begingroup$ @Asaf: Ah - I did not know that tag specialist badges could disappear. That's good to know. Thanks for picking that up - $\endgroup$ – davidlowryduda Dec 15 '12 at 23:41
  • $\begingroup$ This happened to me, when somebody who upvoted me deleted their account. Still have the badge. $\endgroup$ – Brett Frankel Feb 8 '13 at 3:35
  • $\begingroup$ This happened yesterday, when the Integral tag was eliminated. I had a silver badge in Integral and assumed it was lost. Then it turned out that, while I did seem to lose it, I made up for it because the tag was migrated to Integration and I gained a silver (and gold to boot!) badge for that tag. $\endgroup$ – Ron Gordon Oct 24 '13 at 17:34
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    $\begingroup$ The remark about the "next badge" is no longer true see meta.stackexchange.com/questions/81013/… or the relevant section of meta.stackexchange.com/questions/17853/how-do-badges-work Somewhat separately it may make sense to do some duping or merging with meta.math.stackexchange.com/questions/21815/… Or maybe one keeps them separate for the different emphasis on usual vs tag. $\endgroup$ – quid Oct 28 '15 at 22:43
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As pointed out in Asaf's comment, one exception is that tag badges can be removed.

I will copy here the content of Arthur Fischer's comment from another question, where he provided more details:

The regular badges are never removed (except in extreme circumstances). As the tag badges depend on your scores in tags, they are removed whenever you no longer match the criteria. (See MSO FAQ posts 1 and 2 for details.)

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