I have exactly the same problem... Just noticed it about 10 to 12 days ago... Not sure when 16.5.1 was updated? does anyone know when it came out? I called apple and they said my phone battery was fine after sharing screen and doing diagnostics.. But believed me and made an appointment at the Apple Store. Went the next day and they said it was fine too. So irritating.. My phone is drained every day by 3 pm after normal use and full charge at 8 am.. Usage maybe 1 to 2 hours of talk time, 5 to 10 texts, 1 email read..Crazy making! I called again on Tues and the support told me to reset to factory settings... Now I am dealing with making everything normal again..Siri, fonts, bluetooth, and so on but now Battery wear is even worse!!! Today my phone was dead by 2 pm ( fully charged at 8 am)
My phone was fine up until a few weeks ago! I bought it in April. I called apple again today and they told me to update to 16.6 Which I did tonight while plugged in. I made one 20 minute phone call tonight and my battery went from 95% charged to 80%! This is unacceptable! for a phone I still owe $900 for! Please call apple and a make a complaint everyone! Something is wrong!