Neither link gives numbers, but for perspective: a Nintendo DS power supply's output is 5.2V, 450mA; that's 2.34W (peak).You'll need to charge ~427 hours (almost 18 solid days) at that rate to use a kWh -- average cost per kWh in the US: $0.10.So it's neat, a nice symbolic accessory & your $50 does support R&D for this type of thing-- but your direct benefits are small.
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Neither link gives numbers, but for perspective: a Nintendo DS power supply's output is 5.2V, 450mA; that's 2.34W (peak).
You'll need to charge ~427 hours (almost 18 solid days) at that rate to use a kWh -- average cost per kWh in the US: $0.10.
So it's neat, a nice symbolic accessory & your $50 does support R&D for this type of thing-- but your direct benefits are small.