A few days ago i updated the firmware of my galaxy watch active 2 to the FW r820xxu1fvh4, but 2 days later the battery, which would last for almost 3 days suddenly doesn't last 10 hours.
Tried to reset, delete, reset again but nothing helped.
Anyone had the same problem could fix it?
Give it a couple days and hopefully your battery life will get better.
It may happen during the update process, not after or even after a reset.
If it happens is something did by the devoleper when the software was not properly tested.
Since the last update merged somethings of the watch 5, they may have not made the unity test for it causing some incompatibility.