[Feature Request]: Battery Pack calibration status

[TomHarm]

Describe your feature request

We would like to add the battery pack calibration status to the integration. Mainly the registers are:

I´m aware @heinemannj already proposed a merge for the underlying library a year ago. Perhaps, we can liaise on this and bring this patch up and running in a near future. I would volunteer on adding the sensors to the integration then.

Proper usage

• I confirm that this is not a bug report or support request
• I confirm that this feature request is within the stated scope of the integration