After a full battery charge by 100%, when used, the charge is reduced to 67% and so shows until the battery is completely discharged
[Re-Titled by Moderator]
You’ll need to have the battery checked out and possibly replaced.
If you’re in the US please call 1-800-MY-APPLE or outside the US, consult the support articles below.
Contact Apple for support and service - Apple Support
What is the health percentage of the battery? Which iPhone model do you have? Have you ever replaced the battery? Your battery is exhibiting behavior that happens when a lithium battery is near or reaches it’s End of Life (EOL).
The battery is probably not native. Bought a supported iPhone
Apple iPhone 12. Battery health is 100%.
Is that the original Apple battery or has the battery be replaced? Aren you the original owner of the iPhone or did you purchase a used iPhone?
My iPhone battery drops to 67% after full charge
