I think the problem is that you are using 2 tags.
At this page is showed how to use virtual devices.
https://community.homey.app/t/howto-set-a-value-to-a-virtual-device/45883
There they use examples for temperature.
I tink that you must use neasure_battery as tekst.
But it depends on the capabilitys of your device.
If I am wrong there are more people reading here so the right answer will eventually show up…
