Pisen Electronics via Amazon offers its Pisen 2-in-1 Portable Charger and 5,000mAh Travel Battery Pack in Black or Gold for $18.99. Coupon code "PISEN5CB" drops it to $12.91. Plus, Prime members bag free shipping. That's tied with our mention from three weeks ago, $6 off list, and the lowest price we could find. It features a folding AC plug. Deal ends January 31.