But I recently put in a new battery and have the phone in a Jackery battery case. The update was just installed so time will tell.

HOWEVER I see a lot more features that can cause more battery use. On this phone I am not signed into iCloud or much else. I don't even have it checking mail. I usually get 5 or more days on a charge (thanks to the new battery and Jackery case?)

So you wrote "without doing anything" but here I see a lot more bells and whistles so it may take time to turn them all off.