Multiple battery sensor alert email - is there a better way?

[skatun (Kim Skatun)]

see this link.
I will write it up better next week..now with alexa text to speech support aswell

Generic notification rule

In my nice little flat I do have 20+ sensor to measure weather, temperature and plant health. Almost all of these runs of battery which unfortunately runs out once in a while. So my idea is to add all these sensor to the group Group_Battery_Level. So by using tips from @rlkoshak my idea is to have a rule that get triggered everytime the group receives an update, then if the battery level is below 20% then send out a warning, if below 10% starts to manipulate lights to draw attention. So the…