I was wondering if the cable that connects the power brick to the battery is removable????  it has a cut out for the cord where it attaches, and looks like it should pull out but I don’t want to damage it by trying to pry it out.  I am making a custom case for it and would be ideal if it detached.

Hi there, you mean the power cable as the picture below shows? If yes, it is removable. Thanks!

No, the cable between the battery connector and the brick is not removable.