Changing the Xiaomi Mi Mix battery would be necessary in cases where we notice that the autonomy of the device is not as effective as in the beginning. 
Battery HERE https://s.click.aliexpress.com/e/_A2Icvu
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We always recommend the use of original spare parts Xiaomi
MovilOne is not responsible for any damages that may occur during the repair due to missing tools or insufficient experience. If you have any question about how to change the battery or any question about how to repair the Xiaomi Mi Mix please leave your comment above and we ll be glad to answer it.