Annual Cost of Charging an iPad at $1.36, news release.
Consumers who fully charge their iPad tablet every other day can expect to pay $1.36 for the electricity needed annually to power the device, according to an assessment by the Electric Power Research Institute (EPRI).
Wow, that's insane. That's the annual cost. Considering the bright, super-high-res screen and the (for a hand-held) very powerful processing, that can only be considered a bargain. Apple has really scored top points with the power-economy here. (Also considered as how much performance you can squeeze out of a given processor, amount of memory, etc.)
I haven't done this test recently, but I once ran a graphic screen-clock application on my iPad 1 non-stop, and the battery lasted over 15 hours. That is of course with the processor not doing much work, but with the screen on constantly.
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