Thanks to u/SconnieFella on Reddit, we now have an FCC document confirming that the Mini will use USB-C on the plug end of it's power cord. So the "20 watt power adapter" included in the box is almost certainly the same one being sold for iPhone/iPad use.
Based on this and estimating the power draw and voltage used, it should last between 4 and 10 hours on a 10,000 mAh power bank. I'm assuming closer to 8-10 than 4, but until I have one and can measure its power use I had to leave a big margin of error.
1.2
Table 1-2. ISED Limits for Maximum Permissible Exposure (MPE) EUT Description
The Equipment Under Test (EUT) is the Apple Smart Speaker FCC ID: BCG-A2374 and IC: 579C- A2374 with touch display, microphone and captive USB-C power cable.
Based on this and estimating the power draw and voltage used, it should last between 4 and 10 hours on a 10,000 mAh power bank. I'm assuming closer to 8-10 than 4, but until I have one and can measure its power use I had to leave a big margin of error.
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