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Dual USB 5V 3A Power Bank Module can be use with 18650 3.7v Cell. It maybe use with any li-ion battery. Not only - but you can also easily make your own power bank using this Power Bank Module. It has battery level indication with in.
The circuit board is connect to the battery negative B-, B + is positive. It should be noted that do not connect reversed. While connecting reversed will burn the board also the battery is connected in parallel, assembling the 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.
1 x Dual USB 5V 3A Power Bank Module