IOS Battery drain - background activities

Hi everyone,
I read on the forum that other people have already had this problem, but I haven’t found any solution yet.
On my iPhone (ios 18) the app does a continuous background activity, even though I have deleted every type of authorization, local push and everything else.
Can anyone tell me if there is a solution to the problem?

Thank’s

I had considerable battery drainage especially on my Apple watches and decided to remove the Icloud integrations and for location sharing we now only use the HA App.
I have not seen any relevant drainage from using the HA App on our Iphones.

what about the backround activities? do you see it in the battery options?

I am not sure to understand your question. For my purposes, the only thing I am interested in, with our Iphones and HA, is location, The HA App gives me that and I believe actually more accurate (faster) than the Icloud integrations.
The Iphone and Apple watches battery drainage is measured by obvious observation. The battery of the Apple watch that I use at night would often not make it till morning when using the Icloud integrations.