Why does the battery duration of the Xiaomi Buds 5 Pro sometimes last less than 3 hours, but sometimes up to 6 hours?

For your reference, here are some common reasons: 
1. This is primarily due to active noise cancellation and Dimensional audio being turned on, the earbuds’ power consumption reaches its peak, resulting in around 3 hours of battery life. It is recommended to turn off features that are not frequently used can improve battery life;
2. When the earbuds are operated at high volume, the battery will consume faster. At higher volume, the power demand of the earbuds increases, so the battery life is shorter. If the volume is lower, the battery consumption is relatively less, and the battery life will be longer;
3. If you use your earbuds frequently for long periods of time throughout the day, the battery life between charges will vary.