The advertised battery life is obtained from Xiaomi laboratories. It is normal that there will be certain differences due to signal interference and electromagnetic interference in actual environments.
For your reference, here are some factors that can influence the actual battery life:
1. Higher volume levels can drain the battery faster than the conditions used for testing;
2. Extreme temperatures or interference from other electronic devices can affect battery performance and longevity;
3. Interference from other wireless devices or physical obstructions can affect performance and battery life;
4. The battery life can vary depending on the connected device’s Bluetooth codec and settings;
5. Over time, battery performance naturally degrades, affecting how long a charge lasts compared to when the earbuds were new.