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What your gear costs to run, in dollars and watt-hours

Thing Powered answers one question before you buy: which model costs less to own, or runs longer on one charge. Plugged-in devices get a yearly running cost at your state's electricity rate. Cordless ones get runtime in watt-hours and the price of the next battery.

Every figure shows where it came from and when it was pulled. When a pricier, more efficient model never repays its premium, we say so.