Iphone Charging Not Going Beyond 80. Here are some tricks you can try. Many times simply restarting your iPhone will correct the problems with your battery.

Wondering why your iPhone is not charging after 80 percent. Your iPhone might get slightly warmer while it charges. Your iPhone will charge again when the temperature drops.
Wondering why your iPhone is not charging after 80 percent.
Here are some tricks you can try. Optimized Battery Charging is on by default when you set up your iPhone or after updating to iOS 13 or later. One the biggest changes from the iPhone 7 and earlier to the iPhone 8 and iPhone X was the innovation of wireless charging. Here comes how to fix iPhone battery percentage stuck using this method.
