20pcs/1pc 3.7V 1S 2.5A 14500 li-ion BMS PCM Battery 2S 7.4V 8.4V Protection Board Module Overcharge Over Discharge Protection

20pcs/1pc 3.7V 1S 2.5A 14500 li-ion BMS PCM Battery 2S 7.4V 8.4V Protection Board Module Overcharge Over Discharge Protection

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