My understanding of the USB spec is that +5V is available (at different current ratings depending on the USB variant). 18 amps at 1 volt or 1 amp at 18 volts both equal 18 watts. Watts (or power) is simply volts * current. I wonder if the HomePod mini never really needed 20w, just the 20w power profile and the firmware update simply allows it to use the 18w profile. That's cool that Apple was able to do this with a software update.Īgreed - I was reading in another (MagSafe duo?) thread about USB power profiles the way I understand it is newer USB power supplies offer a different range of voltage and current combinations, so 18 watts with one supply is not the same as 18 watts in another.
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