All of a sudden my phone got delivered these alerts… Still new to the UPS and NUT (been running it for a week or 2 now).
Which makes the notification all the more remarkable to me. It is a new device, so I wouldnt expect the battery to be in need of replacement at all 
Otoh, the entity does show it is from 2001 ??
Ive considered that a NUT issue, but give the notification now I start to wonder…
Running the default automation(well, after this I now added a timestamp in the message) from the documentation, so at least I am sure now events are emitted, and picked up correctly
- id: ups_changed_state
alias: UPS changed state
trigger:
- platform: event
event_type: nut.ups_event
action:
- service: notify.mobile_app_me
data:
title: UPS changed state
message: >
{{now().strftime('%X')}}: {{ trigger.event.data.notify_msg }}
data:
push:
sound:
name: default
critical: 1
volume: 1.0