Hello jrspies,
It sounds like you have concerns regarding battery drain for phones on iOS 16. While you are likely to see some drop in battery performance up to 72 hours after updates as the system completes indexing, you should notice that the performance will return to normal as you continue using the device.
If you continue to see this behavior, you can check your battery health as that can negatively affect performance:
iPhone Battery and Performance
"How to maximize battery performance
“Battery life” is the amount of time a device runs before it needs to be recharged. “Battery lifespan” is the amount of time a battery lasts until it needs to be replaced. One factor affecting battery life and lifespan is the mix of things you do with your device. No matter how you use your device, there are ways to help. A battery’s lifespan is related to its “chemical age,” which is more than just the passage of time. It includes different factors, such as the number of charge cycles and how it was cared for. Follow these tips to maximize battery performance and help extend battery lifespan. For example, keep iPhone half-charged when it’s stored for the long term. Also avoid charging or leaving iPhone in hot environments, including direct sun exposure, for extended periods of time."
If you have further questions, contact Apple Support.
Regards.
