and it's barely past 10 votes.

> The thermistor monitors the internal temperature and dynamically adjusts the power level to reduce output power when the temperature rises.

My guess is that it's dependent on the ambient temperature, but that's just a guess! I can't imagine what the restriction on peak power would be other than temperature rise, though...

Peak power tends to last about 10 minutes or so.

Physically the design is pretty much the same as this new 60/40W version, so I would expect them to eventually offer a 60/40W folding pin UK charger too.

https://www.apple.com/uk/shop/product/MUVT3B/A/20w-usb-c-pow...

https://www.chargerlab.com/complete-pd-3-2-spr-avs-specifica...

Agreed. Seriously, am I missing something or are the compact chargers from various other companies at least as compelling as this? I've got a nice one from Lenovo with high output and a smaller form factor than this. (Several other manufacturers have a similar size and output so nothing special about Lenovo here). The Apple one, while maybe smaller then their usual, is still bigger and appears to be short and "fat" which can limit where you can plug it sometimes.

Or is just another "but this time it is from Apple" kind of thing. (All the vapor chamber talk from a few days ago had me scratching my head too.)

The Apple charger is mildly interesting because they made a slightly smaller than usual one that displays a dynamic behavior where it boosts up to 60W. That’s it.

(If you actually mean efficiency of energy delivered, and not time efficiency… the energy efficiency of charging your own personal phone is completely irrelevant to anything. You could save many times that amount of energy per year by switching to a heat pump water heater, or a heat pump clothes dryer, but most people haven’t.)