2S2P 18650 battery pack 7.4V 18650 battery welding 6000mAh with XH2.54 PH2.0 Protection Replacement Battery Recorder loudspeaker

2S2P 18650 battery pack 7.4V 18650 battery welding 6000mAh with XH2.54 PH2.0 Protection Replacement Battery Recorder loudspeaker

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