Direct answer
Charging may pause near 80% because of an optimized charge limit or battery temperature. Cooling and the charge-limit screen distinguish intended protection from a port or battery fault.
What this covers
- The observed symptom matches this record
- Customer-accessible settings, connections and external components
- Diagnosis before reset, deletion or component replacement
What it does not cover
- ×A model-specific error code with a different documented meaning
- ×Internal electrical, battery-cell, gas, refrigeration or sealed-component repair
- ×A guarantee that every model exposes the same control label
Capture the exact symptom
ReversibleCheck the battery icon message, device temperature and Settings › Battery charging options.
Run the smallest isolation test
ReversibleRemove the case if hot, move to room temperature and test a known-good certified cable and adapter.
Correct only the proven cause
ReversibleLeave optimization enabled unless a full charge is needed; clean only loose port debris without metal or liquid.
Verify before changing anything else
ReversibleConfirm charging resumes after cooling or at the next scheduled full-charge window.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check before resetting anything?+
Check the battery icon message, device temperature and Settings › Battery charging options.
What is the safest isolation test?+
Remove the case if hot, move to room temperature and test a known-good certified cable and adapter.
When should I stop troubleshooting?+
Stop for heat, swelling, liquid warnings, melted cable ends or a loose/burned port.
Answer for the exact device and software version shown above.