River MAX invalid battery level reporting

[vadimzzz]

The integration works fine with my River MAX but reported battery level is always lower than the level reported by official app. The difference between reported levels is not constant and may be from 3 to 10 percent.

Here are a screenshots made at the same time

[Max-Solar]

Same problem here. Vg Max

[Nid01]

Does the integration for example show an invalid value right after reloading it, while you have the app open on your smartphone?