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Battery type: Rechargeable lithium-ion batteryBattery capacity: 57 mAh(earphones)/ 566 mAh(charging case)Music play time (LHDC, Default setting, 50% volume)*: Max Noise Cancellation: 5 h (single charge) / 20 h (with charging case),Noise Cancellation Off: 6.5 h (single charge) / 27 h (with charging case)Music play time (AAC, Default setting, 50% volume)*: Max Noise Cancellation: 5.5 h (single charge), 22 h (with charging case), Noise Cancellation Off: 9.5 h (single charge), 40 h (with charging case)Charging and play time data is based on OPPO laboratory testing conducted in a 25℃ environment with a standard OPPO charger. Actual charging and play time will vary according to the specific environment and charger used.