I tried to post this as a reply to a recent post on the same topic but it would not post.
About 2 months ago I picked up a used Instinct 2. It said irt had 20 days of battery. I charged it fully and it had 36 days. I configured it and began using it. I use it a lot. Almost all features daily.
I do not get 36 days but I get 7-8 which is respectable considering the useage.
About 3 weeks ago that battery dropped to about 3 days. I hit up the forums, the Google, the AI etc. and performed all suggested actions. Disable Pulse OX, disable Bluetooth, Disable HRM (not at same time), soft reset (3x), hard rest (1x), check for updates (current), clear stuck updates (none) and I've never used custom watch faces.
I have not disabled GPS because I cannot find that option but I have set it to the least accurate and best battery option.
As of this week, it lasts about 36 hours (not days) and I've barely usedit for anything but telling time. A very light usage week.
I have not turned on Battery Saver but that is next after it charges again. IF that restores the battery to XX amount of days, what does that mean?
Big fan of the watch, the features, the options, the app etc. I suppose if I have to charge it every day it is not the end of the world but the drain seems to be growing so not sure how many days it has left.