This has been bugging me since the original post, I never thought about what was in there. They're pretty basic to me. I looked, and looked, too far I think. Now I thought it has to be basic, and low and behold, the battery is held down with two 10mm nuts, and the length of the tool is aprox three inches above the top of the accumulator, for the other half. I think it might be for removing that and that only. I'm not a betting man, and have been mistaken before, but that's my best guess so far.
But why the 11mm drive side...... I'll keep looking