SB 2 13.5: Spilled coffee, works when plugged in, shuts off otherwise

Surface Book 2 13.5.

I spilled coffee underneath the base. Turns on and works but immediately turns off when I unplug the charger.

Battery 1 is showing 0% (keyboard battery).

Battery 2 is showing 100% (tablet battery).

Did I ruin just the battery in the keyboard base? The charging port?

Any help or direction is greatly appreciated.

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You may have damaged the part that measures the battery capacity or the battery itself and it may say it holds a charge when in actuality it does not, or it cannot supply the charge

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