Often wearing a single earbud will cause the consumption of the earbud to be faster than that of another earbud. You can wear the left and right earbuds in turn. When the power of a single earbud is low, you can wear another earbud first.
a) Fully charge the earbuds, wear the earbuds normally for a period of time, and check whether the power is normal.
b) Try to reset the earbuds.