Home Assistant Blueprint: Low battery level detection & notification for all battery sensors

low-battery-and-unavailable-check.yaml

blueprint:
  name: Low Battery and Device Unavailable Check
  description: Regularly test all sensors with 'battery' device-class for crossing
    a certain battery level threshold as well as if it is unavailable.
  domain: automation
  input:
    threshold:
      name: Battery warning level threshold
      description: Battery sensors below threshold are assumed to be low-battery (as
        well as binary battery sensors with value 'on').
      default: 20
      selector:
        number:
          min: 5.0
          max: 100.0
          unit_of_measurement: '%'
          mode: slider
          step: 5.0
    time:
      name: Time to test on
      description: Test is run at configured time
      default: '10:00:00'
      selector:
        time: {}
    day:
      name: Weekday to test on
      description: 'Test is run at configured time either everyday (0) or on a given
        weekday (1: Monday ... 7: Sunday)'
      default: 0
      selector:
        number:
          min: 0.0
          max: 7.0
          mode: slider
          step: 1.0
    exclude:
      name: Excluded Sensors
      description: Removed Battery only selection to select any entity like switches. Only entities are supported, devices must be expanded!
      default: {entity_id: []}
      selector:
        target:
    actions:
      name: Actions
      description: Notifications or similar to be run. {{sensors}} is replaced with
        the names of sensors being low on battery.
      selector:
        action: {}
  source_url: https://gist.github.com/sbyx/1f6f434f0903b872b84c4302637d0890
variables:
  day: !input 'day'
  threshold: !input 'threshold'
  exclude: !input 'exclude'
  sensors: >-
    {% set result = namespace(sensors=[]) %}
    {% for state in states.sensor | selectattr('attributes.device_class', '==', 'battery') %}
      {% if 0 <= state.state | int(-1) < threshold | int and not state.entity_id in exclude.entity_id %}
        {% set result.sensors = result.sensors + [ state.name ~ ' (' ~ state.state ~ ' %)'] %}
      {% endif %}
    {% endfor %}
    {% for state in states.sensor | selectattr('attributes.device_class', 'defined') | selectattr('attributes.device_class', '==', 'battery') %}
      {% if "unavailable" in state | string  and not state.entity_id in exclude.entity_id %}
        {% set result.sensors = result.sensors + [ state.name ~ ' (' ~ state.state ~ ')'] %}
      {% endif %}
    {% endfor %}
    {% for state in states.binary_sensor | selectattr('attributes.device_class', '==', 'battery') | selectattr('state', '==', 'on') %}
      {% if not state.entity_id in exclude.entity_id %}
        {% set result.sensors = result.sensors + [ state.name] %}
      {% endif %}
    {% endfor %}
    {% for state in states.binary_sensor | selectattr('attributes.device_class', 'defined') | selectattr('attributes.device_class', '==', 'battery') %}
      {% if "unavailable" in state | string and not state.entity_id in exclude.entity_id %}
        {% set result.sensors = result.sensors + [ state.name ~ ' (' ~ state.state ~ ')'] %}
      {% endif %}
    {% endfor %}
    {% for state in states.switch | selectattr('state','eq','unavailable') %}    
      {% if state.entity_id not in exclude.entity_id %}
        {% set result.sensors = result.sensors + [ state.name ~ ' (' ~ state.state ~ ')'] %}   
      {% endif %}
    {% endfor %}  
    {{result.sensors|join(', ')}}
trigger:
- platform: time
  at: !input 'time'
condition:
- '{{ sensors != '''' and (day | int == 0 or day | int == now().isoweekday()) }}'
action:
- choose: []
  default: !input 'actions'
mode: single

Thanks for this - it works great and saved me a ton of time!