Using a syringe and tubing, I went to work to remedy the problem.
Step 1: Accessing the Cells.
Step 2: Removing the Excess.
Once the levels were good, I closed up the battery and carefully washed the battery and transmission to remove the residual acid.
The engine cranked up great however this battery has now come to its end of life. Replacement necessary.
I have long abandoned lead acid batteries in my equipment in favor of Lithium iron phosphate which is environmentally friendly and far longer life.