What are the small round flat batteries that you use in small devices such as watches, timers etc. called? Are they called the same in British and American English?
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What are those called? Bon-bons or something like that?
I think you might be mixing up pompons and bonbons.
A bonbon is a piece of candy, often covered in chocolate.
A pompon is an ornamental woolen ball.
The word pompon in English can also be spelled pompom or pom-pom.
For what it's worth, I found these images on Google by search for pompons and bonbons:
Sport is a singular noun ("a sport"), whereas sports is not only the plural of sport, but also by convention refers to the general category of all sports. Example: "Tennis is a sport. Tom likes sports, but Harry only likes one sport."
Regarding phrases like "sport(s?) shoes": the way it is usually spoken, you can't hear the difference anyway, so the question is a bit esoteric. BUT the "correct" version (in AmE) would be sports shoes because we are talking about the category of sports. If the shoes are intended for one sport only, then you would say the name of the sport: "baseball shoes".
Best Answer
They are called Button Cells or Coin Batteries. They are widely used in watches, calculators etc, as you mentioned. Quoting Wikipedia,
And as for the usage, these things are called as "Batteries" or "cells". And no matter where you say 'battery', everybody understands what it means. As far as 'cells' go, some people might not interpret its meaning as a portable power source, but as a biological term or a jail cell.