After shutdown for >1 hour, battery always drops to ~74% (100→74, 98→72).

Model: Dell XPS 15 9500

Symptom (fully reproducible):

• Charge to 100%, Shut down (not sleep/hibernate), leave it >60–90 minutes → power on, battery shows ~74%.

• If it was 98%, it comes back at ~72% (≈26% absolute drop in both cases).

• Whether I leave it for 1–2 hours or overnight, it always “lands” at ~72–74%.

Troubleshooting done:

1. Set Battery Charge = Standard in MyDell and BIOS → Power → Battery Charge Configuration.

2. Disabled Fast Startup; also tested with powercfg -h off and shutdown /s /f /t 0.

3. Battery calibration 1–2 cycles (down to ~10–15% → rest 15–30 min → charge to 100% and keep plugged for 1–2h).

4. Disabled wake timers, unchecked allow device to wake, disabled USB PowerShare/Wake/WoL.

Result: Issue persists — it always drops to ~72–74% after being shut down long enough.