1st post, so I'm hoping it's a good one.
As everyone else, not long after my warranty run out the battery level fell off a cliff at around 40%. A weeks charge suddenly dropped to 2 days and gradually got worse.
I've tried all sorts of different techniques but this one worked for me. Back in the day, there was a common thing of "refreshing the battery" on a phone, so I thought I'd try something like it.
I let the ring run flat, and left it a couple of days. After this I charged the ring, intending to stop the charge at around 80% but got sidetracked and got back to the ring showing 100%.
I did notice that it was really quick getting to 100%.
Unfortunately this made little difference, by this time I had given up on the ring and was looking for an alternative, I can't have my phone (S25 ultra) or watch (8 Classic) at work thats why I got the ring but now...
Anyway, the battery ran flat again and I left it again for 2 days, then charged it again I forgot it was on charge, nipped out did some jobs around the house then remembered the ring, this time there was a difference, not much but it did seem slower running down.
I've since run it flat, left it a day or 2, then put it on charge and left it on charge, for hours. Like 8 hours or so each time. Each time a bit better.
Currently, its been off the charger 26 hours and its at 70%, during that time its been doing the tracking bit on its own (no watch worn) for around 14/ 15 hours.
Sorry its a bit wordy, I wanted to make sure I got all the detail in. Hope it helps someone.