Ultra 2 here. Watch was stellar until 10.1. Was getting 2-3 days/ charge. Post update the overheating battery drain issue started. Battery went full charge to dead in about 4 hours. Re-paired twice and force restarted several times over last 2 days. Today following re-pair set up as new device, I turned off background app refresh, and removed all 3rd party apps from watch. I monitored the battery drain every 30 minutes. It dropped rapidly, about 10% every 30. When I got around 20% I activated low power mode. It seemed to stabilize and watch cooled. After 3 hours I turned background app refresh back on and re added the 3rd party apps I use. I turned low power mode back off and it seems to have remained stable. Below are battery percentages and the time. Going to recharge tonight and see how it holds up tomorrow. For now, it seems to have been fixed. Apple support was little help but the senior advisor I spoke to said he believes it IS a software issue so hopefully they fix it soon. Hope this helps someone.
91 @ 30 minutes 83 @ 60 72 @ 90 60 @120 50 @ 150 39 @ 180 27 @ 210 to low power mode 22 @ 240 (low) 19 @ 270 (low) 19 @ 300 (low) 18 @ 330 (low) 18 @ 360 (low) 17 @ 390 (low turned off and background app refresh turned back on) 16 @ 420 15 @ 450 14 @ 480
That’s a PVC.