1/2 power playback time 20 hours (80% volume). High-fidelity audio sources, volume, etc. will affect the playback time of the headset. After long-term use, the battery will gradually age and require a slightly longer charging time. This is a normal phenomenon. The longer you use the headset to talk, the shorter the standby time of the headset battery. 

Please dispose of these batteries properly and can be recycled. Please contact your local recycling center for the correct treatment. Do not discard the battery into the fire to avoid causing an explosion.