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Conclusion
To reassemble your device, follow these instructions in reverse order.
Xiaomi Mi Power Bank 2S appeared easy for basic repairs. Glued parts are easy to remove and they stick back just fine. Internals are fixed by screws. Other Mi USB power banks from 2 line (2c, 2i) are built in same way.
Described USB power bank have good charging capacity and is easy for everyday use. Keep in mind that design is not rugged and battery terminals inside are thin metal strips. Try to avoid dropping it against hard surfaces. Kid admitted that he droped his power bank several times - hard to hide dents at outer case corners :)