My Series 4 is weirdly inconsistent when it comes to battery life. Normally, I wear it between about 7am to 9pm, and it usually has about 50% left at the end of the day. Right before I upgraded to WatchOS 10, I had a day when it was down to about 25% by 5pm. Yesterday, it was more or less normal (ended the day at about 45%), but this morning it went from 100% to 96% in a couple of minutes right after I took it off the charger. Since then, however, battery usage has been basically normal.
My Series 4 is weirdly inconsistent when it comes to battery life. Normally, I wear it between about 7am to 9pm, and it usually has about 50% left at the end of the day. Right before I upgraded to WatchOS 10, I had a day when it was down to about 25% by 5pm. Yesterday, it was more or less normal (ended the day at about 45%), but this morning it went from 100% to 96% in a couple of minutes right after I took it off the charger. Since then, however, battery usage has been basically normal.