New Trent offers its New Trent iDual Ports Smartphone Charger 5,000mAh Dual USB External Battery Pack, model no. IMP50D, for $41.95. Coupon code “16IMP50D” drops it to $25.95. With free shipping, that’s tied with our mention from two weeks ago and the lowest total price we could find by $14. This backup battery pack charges up to two devices at once. It includes a USB cable, microUSB tip, and miniUSB tip.