Why Does My Ipad Battery Drain Fast. I own an IPad Air that is around 4 years old. Many possibilities without more details.

15 Tips to Speed Up Your iDevices Battery Today. Disabling background app refresh is a common trick to extend battery life and most users wont notice the difference in terms of how their iPhone or iPad operates. If you go into your settings and turn it off your batter will last much longer.
Auto-Lock is the setting that automatically turns off your iPads display after a certain number of minutes.
Auto-Lock is the setting that automatically turns off your iPads display after a certain number of minutes. It turns on Background App Refresh for all your apps by default. Auto-Lock is the setting that automatically turns off your iPads display after a certain number of minutes. After I noticed the problem I backed up the iPad to iCloud completely erased and reset it and restored from backup.

