When charging, it is usually a bright red indicator light, and the light off indicates that the electricity is full (some earphones are full of blue lights or green lights, and the manual will indicate it).
For maximum battery life, charge only when the battery is low. The average battery charge is about 500 times. That is, the normal service life is about 2 years.
Fully charged normal standby time 2-4 days, when there is a phone normal use is 1-3 days, the phone will be relatively shorter.
The OPPO Bluetooth headset charging indicator will show 1 a blue circle. And then it appears green. Display full is enough.