The next four steps show how to move the logic board out of the way for battery removal. Read the steps first before you attempt it.

Insert the flat end of a spudger underneath the top edge of the logic board.

Carefully lift the logic board by levering the spudger downwards.

Make sure no cables are tangled or interfere with the motherboard during this procedure to avoid cable damage.

Don't try to completely remove the logic board. It's attached to a flex cable that's glued to the iPad frame.