Keep mobile devices ready to go with this Tzumi Endurance PocketJuice portable charger. It has a 15,000 mAh lithium-polymer battery pack to provide most smartphones with up to eight full charges and dual USB ports to handle two devices at once. The QuickChip technology built into this Tzumi Endurance PocketJuice portable charger protects devices from overcharging or overheating.
I purchased this and within the first 2 days the button got jammed. It was not charging my phone even though it said it was precharged. I then tried after charging it & got slow minimal results. I exhanged it but 2nd unit button also got stuck so I guess its a defect.