iOS13.5.1 Performance is fine but the battery % gauge is all over the shop. Seems to plummet down quickly to 1%. After a home key power key reboot it’s returned to a higher % again but now with a steady % drop.
Basically don’t bother. Features available in iOS 13 wont matter for most people in most cases, while more stuff running in the background is definitely not good for battery life, especially when user cannot shutdown unwanted processes (not just apps) by themselves.