Not unplugging it even when it is fully charged.
Most Helpful Guy
It can happen. You can also get hit by a car. There are a zillion other things that are potentially dangerous. But I don't think the danger of an exploding battery is enough to worry about it. Don't intentionally over charge batteries or use damaged batteries, but I wouldn't lose sleep over it.
If the risk was high enough to pose a real danger, something would be done about it. Also, if you've heard about it happening, it's not like some bomb exploding. It can spark or smoke, or even rapidly catch fire, but calling it an explosion is being a little over dramatic.
Just about anything electronic can catch fire. Most electronics have small things inside that can ( and do ) sometimes "pop" and give off a nasty smell. The risk of something bad happening just isn't high enough to worry about.0