Ultrabook Internal Battery: battery fuel-gauge error. The controller estimates remaining capacity incorrectly after ageing or interrupted calibration.

The distinguishing clue

The percentage stays fixed, falls suddenly or disagrees with actual runtime.

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 reported charge with controlled runtime and verified health data. If confirmed: Replace a failed pack or perform only the supported calibration procedure.

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

Related cause to rule out

When the pack is identified but will not accept or deliver normal energy, also consider Ultrabook Internal Battery: battery protection lockout 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.