You can make your own power bank with this power bank case and you can use used laptop batteries or damage power bank batteries or new batteries to power up you phone using this power bank case.
This product comes with 2,1A output current board and you can replacing the board.
Battery Connectors and Spring are not available with this product.
Specifications
Battery Type
18650 ( 4 Batteries Required)
Capacitance
10400mAh (please note this depend on the battery battery mAh x 4)
Current
Output - 1.5A (can upgrade upto 2.1 with board)
Material
Aluminium and Plastic
Output Voltage
5V