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 - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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