Battery operated sensors

[huehlene (Norm)]

I am using several brands of temperature/door sensors that are all battery operated.
Is there a way to manually add a text attribute to each sensors State_Class: Measurement
that I can store the battery size such as CR2450, CR1632, etc?
When I get a Low Battery indication on the battery card, I could see which battery it needs
as a replacement.
Thanks,
Norm

[anon63427907]

You can customize any entity and add attributes to them.

Extend Sensor with custom attribute

It’s possible to add custom attributes to an existing entity. You can do it via Configuration > Customizations or by adding the new attribute to the customize.yaml file (explained here). However, the custom attribute’s value cannot be defined by a template. The value must be a constant like a string or integer. It is possible to change the value of an entity’s state or attribute. It can be done with a python_script like this one. However, that change is not permanent and is lost when Home Assi…