So my iPhone 13 Pro is about a week old, and the battery has been great, as I expected. But today it was terrible! Could it have been the iOS 15.0.1 update?
Looking at Battery in Settings, it shows that it was 100% at 6am when I removed it from the charger, and declined steadily until it hit 20% at about 6pm when it went to low power mode.
I watched no videos, played no games, and did next to no GPS (a few minutes with Transit, the public transportation app). Almost all my time was email and my Twitter client (Twitterrific). The majority of time the phone was in my pocket.
Apple claims this model could play video for 22 hours on a charge??? What could I be doing wrong?