Those with “Performance management applied.” should change battery.
If you have “Peak performance capability” then no point changing for now
https://support.apple.com/en-sg/HT208387
Performance management applied
When the performance management features have been applied, you'll see this message:
This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. Performance management has been applied to help prevent this from happening again. Disable…
If you have “Peak performance capability” then no point changing for now
https://support.apple.com/en-sg/HT208387
Performance management applied
When the performance management features have been applied, you'll see this message:
This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. Performance management has been applied to help prevent this from happening again. Disable…