Sometimes after a software update, the phone can go through a battery usage learning cycle which can make it a bit inconsistent. Should take no more than a week or so.
I also find that it would be worth Wiping the Partition Cashe on the phone.
Always recommend after any software updates
Wiping the Partition Cashe clears out a lot of old or corrupted information that can cause issues
Follow the steps below. You must follow every step and you should be done in about a minute
Turn off your phone.
Connect your phone with a USB cable
to PC or another Samsung mobile
You will see the charging icon on your screen.
Wait till it shows charging with battery percentage.
Next, press and hold the Volume up and Side key simultaneously.
You can press the volume up button just before the Side key.
The Samsung Logo followed by
Samsung Galaxy appears on the
screen.
At this point, release the keys
Phone will boot into Android Recovery mode
In Android recovery mode, using Volume keys, choose "Wipe Cache
Partition" .
Use the power button to accept that.
You will then see its cleared.
Then the top option, reboot phone.
Press the power button to reboot the phone and then sign in normally
