Dual USB 5V 1A 2.1A Mobile Power Bank 18650 Battery Charger PCB Power Module.
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This is the mobile power module Accessories, 18650 Circuit board shell.
Meet the individual needs of your DIY, but you must understand basic electronic assembly.
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. Note that the insulation between the battery and the circuit board, battery lead not to touch the circuit board, so as not to cause a short circuit.
1x Mobile Power Bank 18650 Battery Charger PCB
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Dual USB 5V 1A 2.1A Mobile Power Bank...