Two HomePod mini’s on 35W dual charger?

the answer is NO. Just tested myself with a stereo paired homepod minis. One loads as usual, the second shows a red ligh on the display and doesn’t work.

The power adapter brings continuous DC power to the HomePod mini speaker. Power use will vary by volume (and by what else the HomePod chip has to do). With (12.5%) less watts available for a passive speaker (not HomePod), volume will be (~12.5%) lower. Not sure if it would clip or reduce over the full range. As an active speaker, the HomePod mini may need full 20W to function properly.

It is recommended to use at least a power adapter that has the capacity for the devices. Belkin would have dual USB-C power adapters at higher wattage (20+20W or more), if you insist on using dual port adapter for this. Do inquire with the manufacturer about its appropriateness for the intended use, as this is different from battery charging.

While not directly answering your question (as I don’t know) …

… you might consider the purchase of an inexpensive USB-C VA Meter.

If you have a technical ”bent”, it’s interesting to see how much power devices actually “demand” under various conditions and how they negotiate the actual “flavor” of DC power supplied by the power adaptor.

I don’t know myself, but there is this:

Will the 35W Dual USB-C Port Power Adapte… - Apple Community

Previous post notwithstanding …

… I’d be reluctant to power ANY “non-battery” device with an adaptor having a lower output rating than the adaptor which was originally supplied.

Quite helpful and informative.

I wouldn't have expected that particular behavior.

Thanks for updating w/ substantive, “real world” experience. 👋