iOS 26 Battery drain & Capacity

I updated my iPhone 16 pro to iOS 26 on 9/17. So plenty of time has passed to account for “extra processes” to be completed. I regularly check for & do all App Store app updates. I’ve changed all suggested settings that could use extra battery that I’ve found through research. Like new display settings, wallpaper, background refresh, True Tone, etc. Yet my battery is still dying significantly faster than prior to updating. Not a small difference, it’s huge. I’ve had this new phone for over a year so I know what my “normal” was prior to the update. I’d wake up w/a fully charged phone & regardless of whether I used it for navigation, multiple calls, social media, YouTube, etc; I never had to charge it throughout the day. Ever. Post update, I’m having to put my phone on the charger 2-3x’s throughout the day. It goes from 100% to 70%, within 2-3hrs of leaving my house, then quickly keeps going down.

Also, battery capacity was 98% prior to update but decreased to 92% in 1m time since updating. I’d love to know what the issue is & why this is happening because having to constantly have chargers w/me & a backup battery device is beyond inconvenient.