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

This is primarily due to the aptX lossless feature, which involves high bit-rate transmission. When this feature is combined with active noise cancellation and spatial audio, the earbuds’ power consumption reaches its peak, resulting in around 3 hours of battery life. Turning off features that are not frequently used can improve battery life.