Dell Precision 3470 – Severe battery drain after Windows 11 25H2 update (build 26200.7705)

Hey everyone,

I have a Dell Precision 3470 (12th Gen i5-1250P, 16GB RAM, Iris Xe) and since upgrading to Windows 11 25H2 (OS build 26200.7705, installed Dec 2025), the battery drains very fast even at idle.

Battery report 
-Design Capacity: 64007 mWh
- Full Charge Capacity: 48792 mWh (~76% health 

What I've already tried:
- Disabled most startup apps (WhatsApp, Copilot, IDM, etc.)
- Reset power plans with powercfg -restoredefaultschemes
- Turned on Battery Saver
- Clean boot-ish state

Still drains noticeably faster than on 24H2. No crazy apps running, room temp ~27°C, CPU idles ~21°C package.

Anyone else with Precision 3470 on 25H2 seeing this? Any specific Dell drivers, BIOS version, or power settings that helped? Thanks.