Childhood Gameboy won't turn on? | I try to fix this one badly

Ok so I could have edited this out. My brain took a nap at the start, but the lack of power from my mistake, did fit into the narrative of the seller's description. So I never questioned whether I was doing something wrong. Eventually the penny dropped and I realise how stupid I look. Enjoy the video. Found the video helpful? Say thanks with a small tip. paypal.me/philipbryden