To visualize the battery level of the Amy® io, it is necessary to pair beforehand the controller to TaHoma: How to add my Amy® io and its indoor temperature sensor in TaHoma?
Then, please visit the "…" menu of the TaHoma app, select "My remote controls" and your Amy.
There are two types of indicators : HIGH or VERY LOW
If your Amy io has a sensor, you can see the battery level by clicking on the data feedback sensor inthe "My home" menu
If the battery is level is very low, you need to change it as soon as possible: How to replace the battery of Amy® io?