Wipers use very little power, lights use very little power. You do not need to close the app to save power. Yes, climate control uses some power, but not enough to need to turn it off. It sounds like you don’t understand the car very well and are making incorrect assumptions. 2% is still a problem? It may not even be 2% at all… your car is estimating the battery percentage. A temperature change can be enough to affect the estimate by 2%. If you are still worried, why not just keep it plugged in (if possible)?