Ultrabook Internal Battery: battery cell imbalance. One cell group reaches its voltage limit before the others.

The distinguishing clue

The percentage jumps, charging stops early or shutdown occurs with charge still reported.

Checks before an assessment

Look for a raised touchpad, separating case seam or changed keyboard fit without pressing on it. Any swelling is a reason to stop charging.

Stop point: Do not press a raised touchpad or bend a swollen pouch cell.

Workshop confirmation and repair

Device-level check: Inspect for swelling, read capacity data and compare light and moderate load away from an unsafe pack.

Targeted check: Compare pack data and voltage behaviour across a controlled charge and discharge. If confirmed: Replace the imbalanced pack after confirming the charger is stable.

Repair boundary: Replace the exact thin battery and inspect the palm-rest structure for pressure damage.

Related cause to rule out

When runtime falls steadily and the laptop may shut down when demand increases, also consider Ultrabook Internal Battery: worn battery cells before choosing a repair.

Checks after the work

After repair or replacement, check case fit, touchpad, full charge, discharge, sleep and temperature.

For an AEPC repair assessment in East Auckland, provide the exact model and observed clue. Call 027 908 8880 before visiting the Burswood workshop.