You are measuring at the posts, (not the clamps on the posts) and you are dropping from 12.2 V to 3.8 V.
There are two things that can cause this, the battery does not have sufficient remaing capacity to maintain 11 V while cranking or the load in the starter circuit is greater than what the battery can keep up with.
So, bad battery or a dead short.
Some times you can pull the caps and observe the water in the cells. If one is bubbling a bunch you have a bad cell.
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Today's Featured Article - Talk of the Town: What's The "Stuckest" You've Ever Been? - by Edited by Kim Pratt. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I was about 14 (part of the problem) when I got stuck. I was disking with a cab equipped IH 966. The window was dirty and I was driving into the evening sun. It was hard to see and it was my first pass down the field. I got the tractor so stuck that the underside of the tractor was resting on the ground. My uncle wanted
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