For those who are interested, I conducted a capacity measurement of an IKEA power bank under what I would consider real-life conditions. I charged various devices at different speeds to gather data.
The power bank in question is approximately 4 months old and has seen minimal usage.
According to IKEA, the Solbana power bank has a stated capacity of around 10,000mAh.
Using a smart China dongle meter called "Keweisi," I measured a capacity of 6,731mAh during the total discharge time of approximately 7 hours and 20 minutes. It's worth noting that a constant high load may yield different results, possibly even better ones.
It's important to keep in mind that the capacity stated on power banks refers to the capacity of the battery itself. However, when it comes to practical usage, you need to take into account the conversion process and the efficiency of power transfer at the USB voltage level. Consequently, the actual usable capacity is never explicitly the same as the capacity stated on the packaging.
Power bank does not support QuickCharge (at least there is no information about it), but it can output 2A@5V max. Using best QC3.0 charger I have, I can confirm that it is charging at 5.28V@1.8A - not that bad.
Full charge from 0% to 100% takes 5h:49m, and measured capacity - 8790mAh
Update (2018/12/28):
Another copy (owned by wife, bought 1yr ago) showed different capacity and charged using full 2A.
Measured capacity 9192mAh and full charge takes 5h:34m - interesting, seems that older is better in this case (or sample variation?).
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