The Zoom Power Anode offers the perfect solution for power as it incorporates both a power bank and AC adaptor into one piece.  Simply open the prongs and use the style as an AC adaptor.  The Anode will charge itself while plugged into a wall outlet.  Unplug with a full charge and the Anode will act as a power device with 2,600 mAh at an output speed of 1 Amp.  Power Supply can be monitored by pressing the power button when charger is plugged into a device or at rest.