Try this, to see if it’s just a calibration issue:
Charge it up to 100%, go to watch settings/system/battery and switch off the battery saving mode (and also the battery saving mode at 10%), and use the watch until the battery is completely discharged and the watch automatically turns off. Then put it on the charger and do not remove it until it is 100% (it should take about 2.5 hours). Repeat that same process (100% / 0% / 100%) at least one more time (ideally two more times), and the battery will already be calibrated and giving its best performance
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