1-10pcs CD42 DC 5V 2.1A Mobile Power Board 3.7V/4.2V Charge Discharge Boost Battery Protection Indicator ModuleLithium 18650

1-10pcs CD42 DC 5V 2.1A Mobile Power Board 3.7V/4.2V Charge Discharge Boost Battery Protection Indicator ModuleLithium 18650

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