While most of the news regarding Nintendo's upcoming 3DS handheld has been positive, many gamers balked when they saw that Nintendo estimated the unit's battery life at between three and five hours.

In a recent installment of the company's "Iwata Asks" web feature, Nintendo head Satoru Iwata speaks with designer of the system, Ryuji Umezu, about a number of issues, including the battery life. In the Q&A, Umezu says the reason for the short battery life is the 3DS's LCD backlight and the technical demands of displaying 3D graphics.

“What eats more electricity than anything in a handheld gaming device is the LCD backlight,” says Umezu. 3DS has two backlights, one for each screen, the upper one being used for 3D. “The 3D one has to deliver separate images to the left and right eyes,” he continues. “Which means that in 3D the amount of light delivered to each eye is halved. In order to make it look just as bright as usual, you have to increase the brightness of the backlight, which increases the power used by even more.”

He also says that using the unit's power save feature could extend battery life by 10 to 20 percent, and that playing with 3D graphics turned off (using the 3D slider functionality) could save you up to 25 percent on power draw.

Either way, it's a bit disappointing that the 3DS won't match the excellent battery life of the DS

http://www.gameinformer.com/b/news/archive/2011/01/27/nintendo-explains-3ds-39-s-short-battery-life.aspx