255% available (plugged in)

It's more than a minor aesthetic. The battery won't charge, which renders a laptop a desktop.

Separate problems. My battery works fine. My laptop doesn't turn off when disconnected from mains either. I only have the "255% available" icon glitch.

I heard it was fixed in the latest windows version. I still didn't update so i can't tell.

My system is up to date. The problem remains. Plus, the system doesn’t see the battery.

I was finally able to resolve this issue, I just couldn't sleep knowing that I may be stuck with a $1000 brick so I searched all over the internet (Youtube, Reddit, Microsoft Community) until 4 am and I finally resolved the issue and my battery is finally charging again.

I'm going to try and retrace my steps (and update it as much as I can ) in hopes that this will help other users who end up here because they are having the same issue.

But one thing I need to get off my chest before I start... a lot of people chalking this up as a battery issue and dismissing it by saying "you have a faulty battery", "your battery is done", "make sure the battery is plugged in", "the battery contact is dusty, clean it with isopropyl alcohol", "the battery wire is loose". My experience and research has told me that this is definitely a software issue and this is happening to most people after the 1903 and the 1909 update. Many other users have tried different batteries and they are still getting the same error. I, myself, have a Surface Pro 7 that is 6 months old, there's no way that a Surface Pro battery can be "unplugged" by accident, it's either lazy troubleshooting and/or just people dismissing the claims of these users.

Disclaimer: I only own the Surface Pro 7 and have not tried this on any other laptops. So I can't 100% guarantee that it will work for you or make your device exploded, do this at your own risk and don't hold me accountable. With that said, I hope this will help at least 1 person out there because I have not seen anyone reporting that they have fixed this issue/bug.

Here's what I did to get my Surface Pro to charge again :

1. Disabled the "Surface Battery" in Device Manager (may or may not be necessary). Rebooted
2. Uninstalled every Windows Update on my Surface Pro from newest to oldest up to and including the "Feature Update to Windows 10 Version 1909 via Enablement Package (KB4517245). However, there were 2 items I could not uninstall, and they were the Security Update (KB4560959) and Windows Update (KB4556799). I preformed a rebooted whenever Windows prompted me.
3. At this point, my Surface Pro is back on Windows 10 1903.
4. Uninstalled the Surface Pro 7 firmware msi file (SurfacePro7_Win10_18362_20.051.10390.0.msi). Rebooted the Surface Pro again.
5. Downloaded and ran the Surface Diagnostic Toolfrom Microsoft. Again, I'm not sure if this did anything at all, but there is a Battery Information page in this tool which was blank at this time but showed my battery's information after my Surface Pro was fixed.
6. My Surface Pro had completed all the tests within the Surface Diagnostic Tool successfully, even the 1st test, which was to make sure your Surface Pro was up to date lol.
7. At this point, the Surface System Aggregator Properties within Device Manager/Firmware had yellow exclamation mark and is asking me to reboot the Surface Pro. So I've enabled the Surface Battery in the Device Manager/Battery and rebooted the Surface Pro.
8. After rebooting the Surface Pro, I decided to review all the items inside Device Manager/Firmware... And to my surprise, some of those drivers are still dated Feb/May 2020 even tho I've uninstalled the Windows 10 1909 update and the Surface Pro 7 Firmware mail which was compiled on May 2020 (SurfacePro7_Win10_18362_20.051.10390.0.msi means Firmware was compiled on Year 2020, 1st week of 05). I suspect this is what's causing the issue.
9. Knowing that, I've decided to perform a rollback on the items inside Device Manager/Firmware which contained drivers that were dated Feb 2020 or newer. Unfortunately, I did not remember the order to which I performed the rollback nor do I remember if a reboot was done (too tired at this point...) but my Surface Pro's battery was being recognized by the system again and has started charging again.
10. I've compiled a table below with what I currently have installed on my Surface Pro. So please take a look and compare your driver version and date, hopefully this will help restore your Surface's battery.

So here are some of the interesting things I've tried or noticed during my research/troubleshoo ting:

1. I've never used or own a 3rd party Surface Pro charger and the LED on my power connector is a solid white when plugged in, so this may only apply to those that are in the same boat.
2. "Surface battery won’t charge or Surface won’t run on battery" is the number 1 problem on Microsoft's Surface Pro support site.
3. The reason why the battery is showing 255% available:

the 8-bit unsigned integer 255 has the binary value 11111111; incidentally, in signed (positive/negative) notation, this is -1, which has been used for decades to indicate an error condition. Neither Windows nor the driver for the power management controller are paying attention that there's a problem.

5. My Type Cover keyboard would not work while I'm having this issue nor does it show up in my Device Manager or Bluetooth devices.
6. My Surface Pro's performance is extremely sluggish and degraded (Windows Hello doesn't recognize me) but a check in Task Manager shows that CPU/Ram usage is at a minimal.
7. I've tried some basic troubleshooting steps that Microsoft has suggested which did not resolve the issue:
   • Uninstalling the battery driver called "Microsoft Surface ACPI-Compliant Control Method Battery" in Device Manager. This item is not present in my 1903 or 1909 Surface Pro 7, only "Surface Battery" is present and uninstalling it/disabling it does nothing.
   • Installed the newest Surface Pro 7 firmware msi file (SurfacePro7_Win10_18362_20.051.10390.0.msi). Seems like it updated some of the Surface Firmware components in the Device Manager but doesn't resolve the issue.

As of this moment, I've paused any and every Windows Update until August 1st ,2020 (the latest date I'm able to choose), and I hope they would address and fix this before they force the Windows 10 1909/2004 release on everyone.

Glad this worked for you. Now we need a fix for those on other laptops.

I finally updated to version 2004 and the "255% available" bug is gone. It now correctly says that no battery is detected.