The iPhone 12 Mini was meant to be an iPhone 12, only in a smaller case, with no compromises.
It seems however this is not the case. Apple’s support documentation has confirmed the iPhone 12 Mini will charge wirelessly over MagSafe at only 12W, vs 15W for the iPhone 12.
The documentation notes, without any other explanation:
For iPhone 12 mini, the MagSafe Charger delivers up to 12W of peak power delivery.
12W is still faster than standard 7.5W or 10W for older wireless chargers, and with the iPhone 12 Mini battery being 20% smaller than the iPhone 12 it may be a difference that no-one will notice.
The two devices otherwise have the same Apple A14 Bionic chip, a dual-camera system, and support for 5G networks, and is considerably cheaper at only $729.
via The verge