Batteries as supercapacitors are electrical storage devices. Battery is more widely used due to its ability to store more energy for a given weight and volume: it has a better energy density. Supercapacitor on the other hand can be charged and discharged very quickly (or slowly if you do not need power): it has a very high power density.
But the differences between these two systems do not stop there. The evolution of these features with the technological improvements and declining prices mean that supercapacitors are increasingly used and will be even more in the future.