I noticed when I apply a theme from theme store there is a theme app icon under running applications.
When I use the stock theme there is no theme application in running applications.
So when you add a theme to your phone there is definitely another application running in background.
But I've used stock and one from theme store and I really can't tell the difference in battery.
The theme app stays running even when you close all running apps. You can check running applications and it's always there unless you go back to stock.Yes indeed, but when you close your active running apps it will disapear, so no worries about that![]()