After reboot, check for updates on Windows Update page and Surface firmware 241.1.139.0 will show up.

Click on Release Preview Ring (make sure that you join the right ring, otherwise things go wild).

On the Windows Insider Program page, click on Get Started and link your Microsoft account if you haven’t already.

Open Settings via Start or Search and navigate to Update & Security page.

However, the update is available only for Release Preview Ring Insiders at the moment. Users on Reddit are also reporting that Microsoft has managed to address the battery issues with Surface Pro 6 and others. The firmware version is 241.1.139.0 for Surface Pro 6. Not sure when the final release date is planned for everyone, but it shouldn’t take much longer,” a user wrote on Microsoft community forum. I will verify a few more times, but it seems that the firmware update fixed the problem at least for my device.

“Indeed, the Release Preview ring of the Insider program contains a new firmware update at least for the Surface Pro 6, and after the first try (firmware update, then shutdown and letting rest for about 6 hours) i don’t have a battery drain any more.

Surface pro 3 wont update