2-Pack: Chargeworx 5000mAh Power Banks $19.99 + FS

MorningSave [morningsave.com] has a 2-Pack: Chargeworx 5000mAh Power Banks on sale for $19.99 - Shipping is Free

Directions:

Select your choice in the dropdown menu on the checkout page (If Applicable)
Choose the $8.99/month option (this gets you 10% back in Stores [Stores.com] Cash + free standard shipping on all orders. One-click cancel, anytime.) Learn More [meh.com]
OR choose the $9.99 standard shipping option
Apply Code FSDEALS or FREESHIP for an $8.99 or $9.99 credit

Note: Must click-through the link in the thread in order for the coupon code to work at checkout.
Features

Choose the Lightning or USB-C connection to match your compatible device for easy charging without carrying around a bulky power bank
Get two compact 5,000mAh power banks for convenient backup power at home, work, while traveling, or anywhere your battery starts running low
Keep an eye on your remaining power with the built-in LCD display, which clearly shows the power bank's current battery level
Enjoy passthrough charging support, allowing you to charge a connected device while the power bank itself is being recharged
Deliver up to 10W of charging power to help get compatible devices powered up when you need an extra boost
Take backup power practically anywhere thanks to the small, pocket-friendly design that measures just over 3 inches at its longest point
Built-in short-circuit and overcharge protection provide added safeguards during everyday charging
Each power bank includes a protective cap and charging cable, giving you the essentials needed for convenient everyday use

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$20