The new stylish 10 mAh Xiaomi power bank has a built-in USB-C cable that also serves as a strap - Xiaomi Planet
Powerbanks

The new stylish 10 mAh Xiaomi power bank has a built-in USB-C cable that also serves as a strap

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Pythro de

It is "admirably" and awkwardly aligned, as every manufacturer puts monocell 18650 into power banks. There are probably about 4 of these. 2500 mAh. Yes, it is cheap, because the tip of 3,7V li-ion 18650 monocells ends at 3500-3600 mAh, where a single such monocell costs 20-25 € (and the cheapest Chinese 18650 batteries between 1000-2000 mAh approx. 4-5 € per piece).
However, it would be much better to make it from monocells 21700. It ends there at 5000 mAh, so TWO would be enough!!!
https://www.iled.sk/18650-li-ion-nabijatelne/fenix-21700-5000mah-36v-chraneny
The price could be up to 25 € per piece with the best quality ones. However, then a 20 mAh power bank would be only a few mm larger than this (it is composed of four monocells). And the indicator in the form of four LEDs instead of percentages on the display is also absolutely low-end.