Battery levels will depend on how much usage each device gets activated and is out of “sleep” mode.
I use this blueprint to have my instance run a weekly check of the battery levels of devices I have yet or a need to run a battery eliminator cable due to where they are setup etc:
It’s set to notify me once a battery gets down to 10% and puts it into the todo list with the battery type it uses, I am also taking advantage of the label feature in HA to make it even easier to filter them heh
