A humanoid robot (C), powered by Matsushita Electric Industrial Co.'s Panasonic brand's new 'EVOLTA' dry-cell batteries, squats while other robots, powered by the company's 'oxyride' batteries (L) and other alkaline batteries, are seen after their power ran out during a comparison demonstration in Tokyo January 15, 2008. The company announced on Tuesday the 'EVOLTA' AA batteries, which will be available in Japan from April 26, 2008, have entered the Guinness Book of World Records as the world's longest lasting AA alkaline battery cell. Reuters Pictures logo Reuters Pictures 49 months ago

A humanoid robot (C), powered by Matsushita Electric Industrial Co.'s Panasonic brand's new 'EVOLTA' dry-cell batteries, squats while other robots, powered by the company's 'oxyride' batteries (L) and other alkaline batteries, are seen after their power ran out during a comparison demonstration in Tokyo January 15, 2008. The company announced on Tuesday the 'EVOLTA' AA batteries, which will be available in Japan from April 26, 2008, have entered the Guinness Book of World Records as the world's longest lasting AA alkaline battery cell.

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