When it comes to battery packs RAVPower makes some of the best out there. Whether your needs are to keep your device charged throughout multiple days of use or you just want a backup resource for power in emergencies, this deal on the RAVPower Element battery pack is a great price for what you get. This is a 10400mAh battery pack so it will hold around three charges for most smartphones, and it has two USB ports so you can also charge two devices at once if need be. There is a microUSB port for charging the pack itself when it runs low on power, and the LED indicator lights will help to identify how much power is left on the pack. It also comes with two of its own microUSB charging cables for charging two devices, so there's no need to make sure you have any extras laying around. If you're interested in grabbing this awesome deal, you can pick it up from the link below at $19.99, but enter promo code – HGDWNM6I at checkout and you'll save an extra $6 bringing the price down to $13.99.

RAVPower Element 10400mAh Portable Charger External Battery Pack