AnkerDirect through Amazon has their Anker PowerCore II 20000 Portable Charger in black, model no. AK-A1260011, for $35.99 (49.99 – 14 coupon) with Free Shipping for a limited time. To get the discount, use the coupon code: Y18A1260 at checkout.
The Anker PowerCore II features 2 USB output ports with Anker’s PowerIQ 2.0 technology that intelligently identifies your device to deliver the fastest possible charge. Its ultra-high capacity is enough power to charge the iPhone 7 over 6 times. It supports rapid recharge, which allows you to top up the battery in as little as 5 hours using a Quick Charge charger.