Iphone 14 battery drain
I bought an iPhone 14, last December. I noticed that when the battery is above 80% it takes a long time to drain, but when it drops below 80%, it drains faster. I used it continously.
iPhone 14, iOS 17
What is really important is the Battery Health / Maximum Capacity. You can check that as follows:
Settings > Battery > Battery Health & Charging > Maximum Capacity
On average, Maximum Capacity declines at a rate of about 1% on average per month. So, if your phone is 12 months old, the Max Capacity would be expected to be about 87-89% at this time.