As @David_Piper status his app is not a virtual battery, it more like a placholder incase you real battery does not appear correct in homey.
BUT
When you combine my flows for a virtual battery and upload the output of my flows to this app. I think it will be a virtual battery showing in homey. (Did not have the time to try it yet)
To keep this thread on-topic, lets follow up discussion on a virtual battery here
