Charging: runs on adapter but battery will not charge

Paraphrased NLCRC checklist for “works on PSU, pack stays at 0% / not charging” (theme common on repair forums; original English for this site). Prove the pack first - Known-good pack if available. A protected pack that will not close its FETs looks like a dead charge IC. - Pack ID / SMBus / 1-wire presence depending on design. Charge path vs system path - System may run from adapter bus while charge path to CELL+/pack is open or current-limited to zero. - Measure charge FET gates and pack-side voltage during a charge attempt — not only at idle. Common mistakes - Replacing the charge IC before confirming sense resistors, thermistor, and EC enable. - Ignoring ACIN / ACOK / CHG_OK style flags the EC needs before enabling charge. - Using a pack with wrong capacity/ID on locked OEM designs. Document adapter voltage, pack voltage, charge current (if any), and IC part number before swapping silicon.