My phone is on android 9, with bluetooth and location on for the stop covid ni app battery drain is noticeably up, I usually could get 3 days light use out, with those features on for covid notification I get about 1.5 days. No, I don't have twitter installed and facebook while pre-installed is never used. Turn off bluetooth or location and battery life goes back up, there's only one system that needs both on to operate. The app itself doesn't actually register as using any battery power, but I've never found those stats to be at all accurate.
So it will be interesting to see whether NHS Covid 19 does the same thing. I don't know why your experience is different. Older android have the notification feature through a google play services update, and this may mean it operates differently in regard of power saving. I also have a relatively compact phone which is normally in a battery saving mode, maybe covid notifications screw that up while those with slabs don't notice any difference.
Biting the hand that feeds IT
