Thanks @NotoriousBDG, but it seems this is because the zwave devices aren’t “ready” at startup and only a few seconds later.
I found it worked by replacing the “value_template” you had above with the “value_template” as seen here.
No more error 
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Awesome. I’ll update my templates with that fix too.
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Tried this:
value_template: '{% if states.zwave.vannsensor_oppvaskmaskin %}
{{ states.zwave.vannsensor_oppvaskmaskin.attributes.battery_level }}
{% else %}
n/a
{% endif %}'
icon_template: >-
{% set battery_level = (states.zwave.vannsensor_oppvaskmaskin.attributes.battery_level)|int('unknown') %}
{% set battery_round = (battery_level|int / 10)|int * 10 %}
{% if battery_level == 'unknown' %}
mdi:battery-unknown
{% else %}
{% if battery_round >= 100 %}
mdi:battery
{% elif battery_round > 0 %}
mdi:battery-{{ battery_round }}
{% else %}
mdi:battery-alert
{% endif %}
{% endif %}
Still got this error:
Could not render icon template Vanndetektor Oppvaskmaskin Batteri: UndefinedError: ‘mappingproxy object’ has no attribute ‘battery_level’
Do you not get this error?
Your first line below icon_template is currently this:
{% set battery_level = (states.zwave.vannsensor_oppvaskmaskin.attributes.battery_level)|int(‘unknown’) %}
It should rather be this:
{% set battery_level = states(‘name of your sensor here’)|int(‘unknown’) %}
Sorry, not sure what you are calling your sensor as you haven’t included that part of the code. In @NotoriousBDG’s example, it would be sensor.mailbox_battery
Hope that helps?
Yes! How could I miss that. Thank you, no more errors! 
Awesome!! Enjoy
Have a problem with my smokesensor templates. Get this error:
Could not render template Branndetektor Kjøkken, the state is unknown.
. Do you know if its possible to get this to work?
branndetektor_kjokken_template:
friendly_name: 'Branndetektor Kjøkken'
value_template: >-
{%- if is_state("sensor.brannvarsler_kjokken_smoke", "2") -%}
Brann
{%- elif is_state("sensor.brannvarsler_kjokken_smoke", "3") -%}
Brann Test
{%- elif float(states.sensor.timestamp_now.state | int - as_timestamp(states.zwave.brannvarsler_kjokken.last_updated)) | float > (5000) -%}
Error
{%- else -%}
Ok
{%- endif -%}
It is this line that is causing the problem:
{%- elif float(states.sensor.timestamp_now.state | int - as_timestamp(states.zwave.brannvarsler_kjokken.last_updated)) | float > (5000) -%}
Error
But really want that function, but meaby possible to fix?
Did you ever get this to work? I’m seeing similar errors, also with a Z-wave device. I’ve got the following in my sensors.yaml:
- platform: template
sensors:
battery_entry_sensor:
value_template: '{% if states.zwave.vision_unknown_type0004_id0000_2 is not none %}
{{ states.zwave.vision_unknown_type0004_id0000_2.attributes.battery_level }}
{% else %}
n/a
{% endif %}'
unit_of_measurement: '%'
friendly_name: 'Door Lock'
icon_template: >
{% set battery = ['-outline','-20','-20','-30','-40','-40','-60','-70','-80','-90',''] %}
{% set charge = (states('battery_entry_sensor') | float / 10) | round %}
mdi:battery-{{ battery[charge] }}for battery, why don’t you just use device_class: battery instead of the icon_template:
- platform: template
sensors:
corridor_motion_sensor_battery:
friendly_name: 'Corridor battery'
unit_of_measurement: '%'
value_template: >
{{ states.sensor.corridor_motion_sensor.attributes.battery }}
device_class: battery
# icon_template: >
# {% set battery_level = states.sensor.corridor_motion_sensor.attributes.battery|default(0)|int %}
# {% set battery_round = (battery_level / 10) |int * 10 %}
# {% if battery_round >= 100 %}
# mdi:battery
## {% elif battery_round > 0 %}
# mdi:battery-{{ battery_round }}
# {% else %}
# mdi:battery-alert
# {% endif %}
6 Likes
That was too easy… thank you!
1 Like
Thanks for suggestion.
Hi, have tried several combinations of the suggestions here, but cant seem to get it working. The sensor always shows the battery-alert icon for all battery levels:
Running Home Assistant v0.92.2. Hope someone can find the error please?
configuration.yaml
using the device_class is the way to go, why did you take that out?
try
{{ state_attr('device_tracker.life360_callum','battery')|round }}
Blockquote
Hi Mariusthvdb, thanks for your help.
Sorry, but I am not sure where I would put the line you suggested and which line(s) it replaces. Here is my original config in text form (hopefully easier to edit):
> - platform: template
> sensors:
> callum_battery:
> value_template: >-
> {{ states.device_tracker.life360_callum.attributes.battery }}
> friendly_name: 'Callum Battery'
> unit_of_measurement: '%'
> #device_class: battery
> icon_template: >-
> {% set battery_level = states.sensor.callum_battery|default(0)|int %}
> {% set battery_round = (battery_level|int / 10)|int * 10 %}
> {% if battery_level == 'unknown' %}
> mdi:battery-unknown
> {% else %}
> {% if battery_round >= 100 %}
> mdi:battery
> {% elif battery_round > 0 %}
> mdi:battery-{{ battery_round }}
> {% else %}
> mdi:battery-alert
> {% endif %}
> {% endif %}its the value_template…
try:
- platform: template
sensors:
callum_battery:
value_template: >
{{ state_attr('device_tracker.life360_callum','battery')|round }}
friendly_name: 'Callum Battery'
unit_of_measurement: '%'
device_class: battery
1 Like
Thanks Mariusthvdb thats works great!
Here is my working and easy solution (no need to define icon level and it does it automatically):
- platform: template
sensors:
# Battery Templates
walkway_motion_sensor_batt:
friendly_name: "Walkway Motion Sensor Battery"
value_template: '{{ states.zwave.zooz_unknown_type_0001_id_0005.attributes.battery_level}}'
unit_of_measurement: '%'
device_class: battery
front_door_sensor_batt:
friendly_name: "Front Door Sensor Battery"
value_template: '{{ states.zwave.aeon_labs_zw120_door_window_sensor_gen5.attributes.battery_level}}'
unit_of_measurement: '%'
device_class: battery
and it comes up like this:
2 Likes
Not sure if the simple solution can show charging, but here’s my sensor template which does.
person_battery:
friendly_name: "Battery"
unit_of_measurement: '%'
value_template: "{{states.device_tracker.life360_person.attributes.battery }}"
icon_template: >-
mdi:battery{% if is_state_attr('device_tracker.life360_person', 'battery_charging', true) %}-charging{% else %}{% endif %}{% if 0<(state_attr('device_tracker.life360_person', 'battery') | float / 10 ) | round(0) * 10 < 100%}-{{ (state_attr('device_tracker.life360_person', 'battery') | float / 10 ) | round(0) * 10 }}{% else %}{% if (state_attr('device_tracker.life360_person', 'battery') | float / 10 ) | round(0) * 10 == 0%}-outline{%else%}{% if is_state_attr('device_tracker.life360_person', 'battery_charging', true) %}-100{% endif %}{% endif %}{% endif %}
I then use the config-template-card on the frontend to have the color change using this in a picture elements card
- entity: '${''sensor.person_battery''}'
style:
'--paper-item-icon-color': >-
${'hsl(' + (states['sensor.person_battery'].state*1.1
)*((states['sensor.person_battery'].state/100)) +
',90%,40%)'}
Some examples of how it looks are here.
1 Like
For anyone visiting this post with a recent version of HA, you can now add device_class: battery you will automatically get the dynamic icon!
List of available device classes: Sensor - Home Assistant
1 Like
it has been that way for some time now…Template Sensor with Dynamic Battery Icon - #17 by Mariusthvdb