I have an S4 that has been in use for approximately 2 years with routine daily use, including Heart Monitoring and recording various exercise types, using Apple activity/workouts as well as third party apps (Strava)...During that entire two year period, my watch would be fully charged in the morning and by the end of the day with regular use, my battery life would average around 30-35% when I put in on the charger again before bedtime...Two days ago, I installed IOS 14 on my IPhone 11 Pro and then installed Watch OS 7 on my S4...Since doing so, my battery life on my S4 has dropped to about 4-5 hours before I get the 10% low battery warning...As a potential fix, I've unpaired my S4 and set up as a new watch per some of the forum advise that I've seen from others with similar problems as well as disabling some notifications settings for various suspect apps, however battery life on my S4 continues to drop at unacceptable accelerated rates...Seems Apple developers will need to take a closer look into this issue as it appears to be relatively widespread.