Ok so I experimented a bit and it seems to have paid off.
I created an all new iCloud account... restored both the watch and phone and charged them to 100%.
I signed into the new account and paired the watch and waited.
Guess what.... it worked. At least it seems to have.
I signed out of the new account and signed back in to the original account leaving iMessage in the cloud off. Seems to be working so far.
also, I made changes to my iCloud security. I turned off recovery Key and left two step verification on.
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First time posting about it but I’ve had this battery problem since around the time iOS 13 came out. It’s gotten so bad it lasts only about 8 hours. I have a S4. I’ve tried wiping it and starting as new. It generally is good for a couple days then by the need of the week it’s back to being terrible again. The usage time and standby time are exactly the same too. I have 0 3rd party apps installed, noice detection off, and Siri off.
Has anyone take to Apple store? I’ve though about it but I’m out of warranty and don’t really wanna pay for a battery replacement if it’s a software problem. Can they pull detailed battery info from it?
I‘m thinking of just trading my S4 in for the S5 to fix it but am skeptical because it might possibly be iCloud related like other have said.
to rule out that it isn’t the watch... backup your phone to either your Mac or the cloud.
unpair and completely erase the watch and phone. When the phone is ready go through the setup process creating a whole new iCloud account. Repair the watch using the new iCloud account and watch it closely and see if the usage/standby numbers return to normal.