[eugeniub]

After looking at the specs, I'm really disappointed. MagSafe by itself already heats up my iPhone 12 mini tremendously compared to a normal wired charger, which can charge up to 20W instead of just 15W (or 12W for my mini). But this battery doesn't do even 12W/15W when not plugged in, it only goes to 5W, the same as the Anker battery, which is less than half the price. Also it only comes in white.

[samatman]

I don't see any compelling reason to choose this over the Anker battery either, but some people don't even consider off-brand accessories and Apple is happy to charge them double or triple for the privilege.

I think 5W is a deliberate design choice, though, for exactly the reason you mention: heat. You can slap the battery on and stick it back in your jeans without roasting your thigh, and the point is to keep your phone working, not to make the battery meter go back to green ASAP.