The Atmos mechanism operates without any winding, and certainly no battery.
For both types start by placing the trunk of the case in the position it is going to occupy.
Look at the drawing, then pass the pendulum up through the trunk door, up the back slot of the board, up through the crutch slot and pass the suspension spring into the slot of the back cock and seat the brass block down into the notch.
Now that the pendulum is on, there is less likelihood of the movement falling forward. Manoeuvre the board backwards or forwards, from side to side, from underneath until the dial lines up perfectly in the hood aperture. With 8 day clocks, untangle the lines carefully and deal with one side at a time.
With 30 hour clocks the base board is often separate and so the rope or chain and pulley will have to be passed through the centre slot and then put up onto the trunk uprights.
Now with the movement still being supported, hang on the pendulum.