From How to fix the Android battery drain issue with these quick tricks:
- Clear the app cache for misbehaving apps, if you know which ones: Settings | Apps, tap the app, tap Storage, and then tap Clear Cache.
- If you don't know which apps, then try clearing cache for all apps: Settings | Storage | Cached Data. Tap OK when it prompts to clear. Reboot.
- If those don't fix the problem, then clear the system cache (you may have to do a search for your device and "clear system cache").
