Aukey’s official Amazon storefront offers its 20000mAh USB Power Bank for $17.09 when you enter coupon code C84K9OIR at checkout. This power bank stands out from the pack because of its giant capacity (it can recharge an iPhone 7 Plus 4.5 times) and Lightning input. What’s more, its dual USB ports can push a combined 3.4A of power. Rated 4.5 out of 5 stars from nearly 300 Amazon reviewers. If you’re looking for an extra Lightning cable for when you travel, we’d recommend going with Anker’s PowerLine+.