Energy-consumption researchers (Opower) released a study showing that Apple's newest smartphone costs just $0.41 per year to charge, or $0.12 less than the Samsung Galaxy S III.

The only big-name consumer device to suck up less power than the iPhone 5 was the iPhone 4, which cost just $0.38 to charge per year.

By comparison, an Xbox 360 costs an average of $40.24 to power per year while a laptop PC costs around $8.31.

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