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USB Type-C 18650 Lithium Battery Charging Module + Protection 18650 lithium battery charging module with protection circuit. Can be used to charge lithium batteries with a voltage of 3.7V of all sizes. The module has a circuit to cut off the power when fully charged and a circuit to cut off the power when the battery is low, preventing battery damage. Order products at https://www.ioxhop.com/p/983