Why does the actual battery endurance of the REDMI Buds 6 seem shorter than advertised?

The battery endurance is closely related to usage habits and scenarios. The advertised battery endurance corresponds to specific testing conditions.
1. Factors that affect battery endurance:
(1). Low earbud battery level;
(2). High volume, which drains the battery faster;
(3). Presence of strong electromagnetic interference or physical obstacles like walls between the earbuds and phone;
(4). Use of higher-quality audio codecs, which can reduce battery life.
2. Tips to improve battery endurance: 
(1). Use the earbuds fully charged;
(2). Lower the volume to check if usage time improves;
(3). Avoid high electromagnetic interference (e.g., microwaves) and ensure no obstacles between the earbuds and phone;
(4). Turn off less-used features like noise cancellation and In-ear detection;
(5). Use audio codecs with better battery efficiency, like AAC.
3. Testing data is obtained in Xiaomi's lab, and differences in real environments due to signal and electromagnetic interference are normal. For example, battery endurance during music playback was tested with earbuds fully charged, noise cancellation and In-ear detection off, 50% volume, and AAC format, achieving up to 10 hours of playback.