Dual USB 5V 1A 2.1A Mobile Power Bank Battery Charger PCB Module Board
2,12 €
USB Output: 5V 2.1A / 5V 1A(Dual USB interface). Micro USB input: 5V 1A. The circuit board is connected to the battery negative B-, B + is the positive, do not connecting reversed, connecting reversed will burn the board, the battery is connected in parallel welding, assembling battery.
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