Hello Joyce Tan,
Welcome to Microsoft Community.
If you are asking separately how to extend the battery life of your Surface device, you can refer to the information in the following support links:
Maximize your Surface battery life - Microsoft Support
But what makes me care more is this:
can't go wireless without power input
Are you referring to the fact that your Surface Pro 6 can't run on battery power without connecting the power adapter? Or does turning on wireless with battery power cause the battery to drain quickly?
What is certain, though, is that your Surface Pro 6's battery is already malfunctioning, either from the power drive or from depletion of the battery itself.
Let me offer you some advice here:
- Plug in your Surface Pro 6.
- Select Search on the taskbar, enter device manager, and then select Device Manager from the list of results.
- Select the arrow next to the Batteries category.
- Double-tap or double-click Microsoft Surface ACPI-Compliant Control Method Battery or Surface Battery, select the Driver tab, and select Uninstall Device > OK.
You can also right-click Microsoft Surface ACPI-Compliant Battery or Surface Battery, and then select Uninstall device.
.
5. Select the computer at the top of all the categories, select the Action menu, and then select Scan for hardware changes.
6. Select Start > Power > Restart.
After restarting, make sure that you can charge the battery of the Surface Pro 6 at this time, and observe whether the battery works normally.
If the above process does not work, we recommend that you try to download the driver and firmware package for Surface Pro 6 directly:
Download Surface Pro 6 Drivers and Firmware from Official Microsoft Download Center
Once the download is complete, double-click and install it, then restart your Surface to check the battery.
Best Regards,
Mitchell | Microsoft Community Support Specialist