If the + bump is the highest point of the cell it will work in every case if that isn’t the case some flashlights/driver which don’t have a spring on the positive side can’t make contact. If the batteries are quality cells can be only found out if you have the shrink wrap and Google the numbers which are written on it.
If they have a too small bump to make contact you could make a solder blob on them, if you have a soldering iron.
Your batteries are not protected. protected means they have an additional circuit on them check this for example pictures
The miller charger can charge 18650s, so it should work with your cells.