Panasonic's new line will feature 8 different models ranging from lightweight and portable to high capacity, energy center. The model in the series with the highest capacity, the QE-QL301, contains 2 USB ports and enough juice to fully charge a smartphone four times on a single charge.
Panasonic’s portable USB Mobile Power Supplies are slated to be released in Japan on May 28, 2012. Unfortunately, other market release dates have not been published yet. If they perform as well as they claim, these mobile power supplies will be great for a variety of applications from spoiled camping trips to actual emergencies involving power outages.