Hi There,
Thanks for the heads-up that sounds super frustrating. You’ve already done a great job narrowing it down, especially noticing that the Battery Limit option is gone from UEFI but the system still won’t charge past 50%. That’s definitely not how it should behave, especially after selecting the 80% profile in Windows.
Here’s What You Can Try:
Check Smart Charging Settings Open the Surface app and look under Battery Settings. If Smart Charging is active, try pausing or disabling it that might be what’s capping the charge.
Run a Battery Report Open Command Prompt and type:
This will generate a report that shows how your battery is behaving and whether it’s misreporting its capacity.
Submit Feedback to Microsoft Since this might be tied to a firmware update, it’s worth reporting through the Feedback Hub app. That way, the Surface team can investigate and possibly push a fix.
Check for Additional Updates Sometimes a follow-up update is released to fix quirks like this. Head to Windows Update and check under Optional Updates just in case.
Explore Service Options If nothing works, you can check out Microsoft’s battery troubleshooting page for repair or service options.
Let me know if you want help running the battery report or submitting feedback I’m here to help however I can!