Vacuum battery properties are deprecated

As of Home Assistant Core 2025.8, the two properties for battery in StateVacuumEntity, battery_level and battery_icon, have been deprecated.

The battery_level and battery_icon properties should be replaced by a separate sensor with the battery sensor device class and optionally a customized icon if the default icon of the battery sensor device class isn't wanted. Optionally consider to also provide a binary sensor with the charging device class if it's currently charging or not.

There is a one-year deprecation period, and the two battery properties will stop working from 2026.8 to ensure all custom integration authors have time to adjust.

More details can be found in the architectural decision.