It is easy enough to make parts that look like this
but in practice typical 18650 batteries that I have seen don’t look like this, but rather more like this (the ones I have are in fact pink like the original single battery Fritzing part!)
which is from this Amazon web page:
The first image is more typical of the Duracell AA batteries. I would think you want the Fritzing part for the battery to look like the real life battery you are using to make things clearer, but I can make the parts either way. I would also recommend buying protected 18650 cells as this web page recommends in the protected vs Unprotected section for safety reasons. It is all too easy to short a battery by accident and have a disaster!
as the typical unprotected cell like the ones above are dangerous if shorted. You may want to source the cells first and then get the Fritzing part made to match the cells you are actually using for maximum clarity.
Peter