I have a iPhone 6s, and had to update to 10.2 due to some apps not updating/ working back in September 2019. My battery immediately lost half of is normal charged life after the update. After turning everything I could off to conserve battery life, also adding low power mode to my main screen to turn on all day, I was able to enjoy my phone with about 65% battery life of what it was before the update. Now I just got AirPod pros, and had to update to 14.1 to enjoy the functions of the AirPods. Immediately once again my battery life when to shit right after the update. I have to charge my phone 5 times a day, just to get the normal usage that I had prior to the update. I watch my phone battery percentage drop in real-time about a percentage every 20-30seconds! Hoping the new update 14.2 fixed the issue with battery drainage, I reluctantly did the update. NO LUCK! Same issues, and may actually be worst! This is BS. My battery health says it’s 75%, but 100% changed I can use my phone for 10-15 minutes before it dies. W. T. F Apple!!!!!