I installed the watchOS 10 RC last week and apparently it's the same as the final version… now, with watchOS 10 my battery life is down to less than 12hrs.
0n 12 March I installed the 10.4 update on my Apple Watch 8 and experienced the batteries life drop as well. The last attempt to recharge caused me to wake up with zero battery power so the data was not posted. I’ve now turned off Wi-Fi to see if it improves.
Here is the specific data.
• 100% 150706Mar WiFi & Loc Off.
xx% 162305Mar WiFi On & Loc.
• 100% 120848Mar WiFi On & Loc Off.
39% 122054Mar WiFi On & Loc. 12.1 ~17.04
• 100% 111042Mar WiFi On & Loc Off.
0% 120730Mar WiFi On & Loc. 20.8 ~20.8
• 100% 091012Mar WiFi On & Loc Off.
10% 110800Mar WiFi On & Loc. 45.8 ~50.89
• 100% 062236Mar WiFi On & Loc Off.
10% 081412Mar WiFi On & Loc. 39.7 ~44.11
• 100% 050806Mar WiFi On & Loc Off.
10% 062118Mar WiFi On & Loc. 37.2 ~41.33
• 100% 031612Mar WiFi On & Loc Off.
xx% 050636Mar WiFi On & Loc. 40.4 ~44.89
• 100% 012130Mar WiFi On & Loc Off.
10% 031418Mar WiFi On & Loc 40.8 ~45.33