Simple extra battery for the expansion bay

I have both faith in you, and a plan B.

Plan B: A roll of velcro and a dream.

Hi there.

Using the back expansion bay, could it be possible to create a battery extension for the laptop 16 ?

I tried to imagine one for the laptop 13 but the space constraints, ventilation grid and lack of a secure way to attach the module seems to render it not feasible in a perfectly harmonious way.