ATC LLC via Amazon offers the Lumsing 10,050mAh Portable Charger in Gold, Black, or Silver, model no. 206-1008-105, for $13.99. Coupon code "NMEUC3BF" cuts that to $9.99. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, it costs an extra $6.13.) That's $8 off and the lowest total price we could find. It features two USB output ports and micro-USB input port and is compatible with a range of iPhones, Android phones, and tablet devices. Deal ends May 15.