Ah! Oh well! If you want you can buy directly from Anker, and cut out the amazon middle man. Depending on you available funds, I’d always go for the higher capacity. It just needs to put out 3A. The high capacity banks like what I’m going to link to have run a norns with a grid for hours straight
Look at Anker.com
Some are available directly through them, not amazon. Although, I’ll never claim a company like Anker to be much better than amazon. Haha