I received a push notification that the app is using battery too much.

Samsung Galaxy devices notify users with warning messages about apps that cause a spike in battery usage.
With frequent usage or many push notifications, customers who have newly installed the "Lysn" app may receive messages notifying them of increased battery usage.
If you select "Power saving exclusions" for the app, the app will enter Power saving mode and you will not receive push notifications when the app is in the background.

*Handle warning messages by following the steps below.
>> Settings in your device - Manage device - Battery - "Power saving exclusions" - Add apps - Select "Lysn"