My Samsung Galaxy S7 with Android 7 has been complaining about the Monument app using too much power and asks permission to put it to sleep. It's reporting the battery usage is 1.15% per hour. I hope that means something to you. I am not particularly noticing poor battery life.
@David: Power consumption should be less if the App is not open. The 190k photos may also be aggravating the situation. Also, we are in the process of improving it a bit. Should be out today.