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Parts That You Need :

1) Old Batteries :

If you use 26650 MAh old Batteries Than You Need – 4 

Here using 5000 mAh Old Batteries – 20   

2) Power Bank Module

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.

Micro USB input: 5V 1A
USB Output: 5V 2.1A / 5V 1A(Dual USB interface)
Charging display: intelligent digital display

Installation instructions:
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.
you can order Power bank module: https://goo.gl/ixq3Pq

3) Spot Welder
Here used Spot welder but, soldering iron also you can use for connecting wires. 
4) Connecting Wire
for batteries connection
Now Here watch video 
How to use this part to make 1,00,000 mAh Power Bank


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