This portable charger can charge up to four devices at once and has dual inputs that let you charge the battery in half the usual time. https://cnet.co/2z62N6y
There aren't a lot of deals out there on the Fold 4, even from Samsung, but we've found a couple you might like. https://www.cnet.com/deals/best-galaxy-z-fold-4-deals/?utm_source=dlvr.it&utm_medium=blogger#ftag=CAD590a51e