I never said you couldn't charge a capacitor like this. I said (a) that it was a bad idea to charge a capacitor living in a portable device using a small power and (b) that it's extremely inefficient. (And (b) tends to imply (a) when the power brick is a tiny little thing with limited heat dissipation.) You also have the capacitor's leads to worry about if you scale to cell-phone-battery-sized capacitors.
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I never said you couldn't charge a capacitor like this. I said (a) that it was a bad idea to charge a capacitor living in a portable device using a small power and (b) that it's extremely inefficient. (And (b) tends to imply (a) when the power brick is a tiny little thing with limited heat dissipation.) You also have the capacitor's leads to worry about if you scale to cell-phone-battery-sized capacitors.