iOS 12.4.1
Why is the latest update draining my battery so quickly?
Question marked as
Without knowing what app or process is using power, we can't tell you that.
Go go to Settings > Battery and see what's using the most power and make adjustments accordingly.
Also, after an iOS update, it's often advisable to reboot your iPad. Assuming you have one with a home button:
Press and hold BOTH the power and home buttons at the SAME time (keep holding past the swipe to power off) until the Apple Logo appears, then let go.
Hopefully, things will settle down for you.