ROG Zephyrus G16 (GA605WI) charger detected but battery won't charge, stuck draining — exhausted troubleshooting, any ideas?
Hey all, hoping someone's run into this exact issue. Laptop is a Zephyrus G16, model GA605WI (RTX 4070), bought in the US, currently about 5 months out of warranty and I'm abroad right now so a warranty repair isn't an option.
What's happening:
- About 5 days after arriving somewhere new (humid coastal climate), it started briefly flashing "not charging" every couple minutes while plugged in
- Armoury Crate still recognizes the charger as connected the whole time
- Eventually the battery just stopped increasing at all — sat at 28%, now down to 23% and slowly dropping
- Unplug the charger and it immediately starts draining like normal on battery
- Currently keeping it plugged in 24/7 so it doesn't die completely
What I've already ruled out:
- Battery health — full charge capacity is ~98% of design capacity per the official battery report, so it's not a worn battery
- Battery Care Mode (80% limit) — switched to 100% Full Capacity, no change
- Loose connector — did the "wiggle test" while watching the charging icon, no flicker at all
- Windows/driver issue — uninstalled and reinstalled the Microsoft AC Adapter + ACPI Control Method Battery drivers, no change
- Software-only bug — booted into BIOS/UEFI and the charging issue persists even before Windows loads
- EC reset (30-60 sec power button hold, unplugged) — no change
The weird part: AC detection itself works perfectly — Windows pops up the "power source changed" notification, switches performance modes, etc. — but the battery percentage doesn't move in either direction while all that's happening. So it seems like the system fully "knows" it's plugged in, it's just not actually charging.
Called ASUS support and they said either test with a different charger (don't have one to test with) or bring it in for diagnosis.
Battery report confirms genuine 200W adapter (ADP-200JB), rectangle connector, nothing unusual there either.
Anyone seen this exact symptom before — detection working but zero actual charge current reaching the battery? Trying to figure out if this is a known charging IC issue on this model before I commit to a repair. Appreciate any input!