Customize battery (device_class)

Configuration
1

Hi. Got some sensor readings from a couple of batteries and I defined them as follow:

# sensor.yaml file
- platform: modbus
  registers:
    - name: Wago_DC1
      slave: 1
      register: 0
      scale: .000915751
      precision: 1
      unit_of_measurement: V

#customize.yaml file
sensor.wago_dc1:
  friendly_name: Batteri 1
  device_class: battery

Shows up fine i UI, but since the battery is 12V is shows up with the “almost empty” icon.
batteri1
Guess it would be full if I had 100V.
Id like to customize this somehow so I get the full battery icon when I have 13V instead.
Not sure if possible and it that case, how?

2

The battery device class assumes that the value is the percentage of the charge. You could simply customize the icon to be mdi:battery.

3

You could use the template sensor and change the icon based on charged.
the template sensor has an icon template

4

Or use the scale: key to factor it to % instead of V, though voltage is a poor indication of % charge for lithium batteries in particular due to their flat discharge curve. Lead-acid is not as bad.