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The highly anticipated iPhone 5 is finally in millions of people’s hands. Within three days of its September 21st launch, Apple had sold a record-breaking five million units. And within a year, analysts project that sales of the iPhone 5 will reach 170 million.

The popularity of the new device got us thinking: how much juice does it take each year to charge a next-generation smartphone? And how does the energy consumption of smartphones compare to that of other consumer electronics?

To find out, we got our hands on a new iPhone 5 and also a Samsung Galaxy S III – currently the hottest Android handset – then headed into the Opower Lab for some testing.