Lately my Nova Pro has become extremely unreliable in the battery department. I used to be able to count on it lasting about a week, or at least 5 days. Lately though it will go from a full charge to 25% while I sleep. Yesterday I charged it fully, read for about 15 minutes before I went to bed, and this morning it’s at 35%. At first I thought it might be because I had the thing turned on which connects to WiFi to sync Notes to Dropbox. Maybe it was trying to connect and not finding a hot spot, over and over. But I turned that off, all networking off, and it still dropped 75% overnight while I wasn’t using it. Is my battery just going bad? This thing is only about 6 months old.
Did you try restarting your device?
If yes, try looking under Settings > Power > Battery Usage and check if there is not an app that uses too much power.
It would not be a surprise if your battery is done for already. Please check this topic.