Sony confirms Vita battery peripheral
September 16th, 2011
Speaking to IGN at the Tokyo Game Show, Sony Worldwide Studios president Shuhei Yoshida said the company would release an external battery pack to help offset Vita's battery life of just three to five hours. "One of the peripherals is the external battery," he said. "That will extend the battery life of PS Vita...so if you're flying from New York to San Francisco, or vice versa, you have no concern because you have an additional, external battery."
http://uk.psp.ign.com/articles/119/1194779p1.html
IGN