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This device DOES hold a charge and doesn't need to be plugged in to be used for charging your phone/tablet ... it must be plugged in to charge the battery. You cannot use it to operate your laptop of its not plugged into an outlet, only the USB port will work (if charged)
Sorry, there was a problem. Please try again later.No, the Travel RockStar Battery Pack + Charger + Surge, BST301 doesn't need to be plugged in all the time to make it work. It is featured with the built in 3000 mAH battery that gives you the power to charge your USB device even when it's not connected to an outlet. To learn more about the unit, check out this link: http://www.belkin.com/us/p/P-BST301/.
Sorry, there was a problem. Please try again later.The dual-outlets only work when connected to AC. The USB port works plugged and unplugged (provided the battery is charged).
Sorry, there was a problem. Please try again later.It will hold its own charge as well as pass through a charge while being plugged in
Sorry, there was a problem. Please try again later.Holds a charge
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