inputs.text: travel charger design - son wife digital devices work long hours travel use extensively travel teaching using equipment often means packing variety adapters cords without doubt royal inconveniencei purchased new trent nt70t external battery pack along 2 additional similar units manufacturers initial evaluation three resulted noting units capacity design concern one competitors battery pack insufficient serve purpose providing partial charge iphone 4s involved carrying series extra accessories charge use battery recharging needsthe new trent nt70t compact relatively self contained well designed unit traveling needs usb charging cord built unit preventing potential loss forgetting needed part location somewhere notcombined standard iphone charging cord plug use charge iphones ipads devices recharge battery pack needed far impressed device already recommended one sisters potential travel use