We’re back with one more iPhone 5 vs Galaxy S3 comparison, after performing our own drop test, comparing them on video, checking out benchmarking results, display quality but also various ads. This time around we’re looking at a report that shares more details about the corresponding electricity cost for each device.

According to Opower, the iPhone 5 will cost you $0.41 to charge every year, while the Galaxy S3 is slightly more expensive, at $0.53 per year. Why is the Galaxy S3 more expensive to charge? The answer to that question is obvious, the Samsung flagship handset has a bigger battery, which means it takes longer to charge.

What’s important to notice is that today’s smartphones are very efficient when it comes to power consumption. Comparatively, laptops, desktops, gaming consoles and TVs are a lot more expensive to charge each year (see the graph below).

Curious how they measured the power consumption of the iPhone 5 and Galaxy S3? They used a Watts Up Pro Electricity Consumption Meter and assumed that “the average smartphone user will charge their device once per day, in the off position, from 0% to 100%.”

Here’s what they found out:

Galaxy SIII: consumed 12.3 watt-hours to charge, taking 2 hours and 26 minutes. Maximum wattage was 6.6 watts, with an average of approximately 5.0 W. Multiplying 0.123 kWh/day by 365 days = 4.49 kWh per year. At the average US residential rate of $0.118/kWh, the annual charging cost is projected to be $0.53/year.

iPhone 5: consumed 9.5 watt-hours to charge, taking 1 hour and 50 minutes. Maximum wattage was 6.3 watts, with an average of approximately 5.0 W. Multiplying 0.0095 kWh/day by 365 days = 3.47 kWh per year. Annual charging cost is projected to be $0.41/year.

Is power consumption something you think about when buying a new mobile device?

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