The Anker Zolo Power Bank is on sale for $13, a 50% discount from its normal price on Amazon.It is the No. 1 bestselling cell phone portable power bank on the site.The power bank has a 10,000-mAh battery and can charge an iPhone 15 times or a Samsung S24 1.94 times.The power bank is compact, measuring 2.58-by-4.32-by-0.92 inches, and comes with a built-in USB-C charging cord.