My Surface Pro 7 thinks the Battery is Gone

[Bob++]

I ran a battery report and got "No batteries are currently installed". There is no icon in the task bar.

It does run on battery, albeit for less time than it used to, so any ideas?

Battery capacity history​

Charge capacity history of the system's batteries

PERIOD	FULL CHARGE CAPACITY	DESIGN CAPACITY
2022-07-22 - 2022-07-29	179,492 mWh	221,817 mWh
2022-07-29 - 2022-08-05	106,320 mWh	131,304 mWh
2022-08-05 - 2022-08-12	181,253 mWh	221,792 mWh
2022-08-12 - 2022-08-19	181,215 mWh	221,795 mWh
2022-08-19 - 2022-08-26	71,032 mWh	87,536 mWh
2022-08-26 - 2022-09-02	-	-
2022-09-02 - 2022-09-09	-	-
2022-09-09	-	-
2022-09-10	-	-
2022-09-11	-	-
2022-09-12	-	-
2022-09-13	-	-
2022-09-14	-	-
2022-09-15	-	-
2022-09-16	-	-
2022-09-17	-	-
2022-09-18	-	-
2022-09-19	-

 

[GreyFox7]

can you quantify runs on battery less than it used to ...

I found this suggestion for a similar problem. I have no idea if it will work.
While on AC power:

1. Verify in device manager that windows thinks firmware is actually applied (no yellow bangs, etc)
2. In device manager uninstall the battery driver (leave files)
3. Leave device connected in this state for at least 1 hour.
4. Power off the device with a long button press (press and hold the power button for about 20 seconds)
5. Leave it connected to AC power overnight – insure that the light on the power supply is lit.

The next day, disconnect from AC power and *then* attempt to power device back on

 

[Bob++]

can you quantify runs on battery less than it used to ...

I found this suggestion for a similar problem. I have no idea if it will work.
While on AC power:

1. Verify in device manager that windows thinks firmware is actually applied (no yellow bangs, etc)
2. In device manager uninstall the battery driver (leave files)
3. Leave device connected in this state for at least 1 hour.
4. Power off the device with a long button press (press and hold the power button for about 20 seconds)
5. Leave it connected to AC power overnight – insure that the light on the power supply is lit.

The next day, disconnect from AC power and *then* attempt to power device back on

I am a bit nervous about doing this.

 

[sharpuser]

I am a bit nervous about doing this.

I have successfully used this trick. It works because the Surface battery protection circuitry gets confused whether it needs to charge, or shut down. Because of this, it refuses a charge, except for a tiny trickle, which is necessary to operate that very circuitry. After several hours, the trickle then reaches the threshold to resume normal battery maintenance.

Give it a go.

 

[Bob++]

I will. Just need to pick the right time.