⤳ Application I use :
★ My Modified Mi Fit.
⤳ How I use my Mi Band 4 :
★ One/Two alarm(s) eachday.
★ Notifications for some applications.
★ Heart rate assistant during sleep.
★ Lot of watchfaces synchronization.
★ Some Firmwares flash.
★ Some smartband languages modification.
⤳ After 16 days, the smartband battery is at 19%.
Maybe it can be good try re-calibrate your smartband battery.
Discharge your Mi Band 4 completly, disable Bluetooth on your smartphone and fully charge it
.