iPhone 14 Pro battery drain after restart

Hello Edward_yc,

And everyone else. This is something I would want looked into as well. I have a few questions so that the rest of us can get as much information as possible and maybe some steps to try.

Does this happen out of the box or after restoring your data? Do you have any network based apps installed that may be pulling in a lot of data and using that battery during start up? Are you connected to Wi-Fi or cellular when this happens. I also hope you don't think it forward to ask who is your carrier?

As a suggestion, to isolate if this is hardware or software, does this occur after you have backed up to iCloud or a computer How to back up your iPhone, iPad, and iPod touch - Apple Support

please ensure that your cloud data such as photos and messages are backed up as well if you are using the feature in iCloud photos and messages. Keep your messages up to date with iCloud - Apple Support

Set up and use iCloud Photos - Apple Support

Then you can try to restore your phone and set up as a new device, not from backup. Use the device for a few days and see if it still happens. If so then this I would recommend reaching out to Apple. If not, then this may be a service or app using network resources and draining the batter upon start up.

When reaching out to Apple they may have you repeat some of these steps to get a handle on this as well.

Thank you

Mikel Smart